Nissan Sentra B18 (2020-2025) Service Manual: Diagnosis System (ecm)

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Engine Control System :: Mr20dd / System Description / Diagnosis System (ecm)

On Board Diagnosis Function

Diagnosis Description

Diagnosis Description

ON BOARD DIAGNOSIS ITEM

The on board diagnostic system has the following functions.

Diagnostic test mode	Function
Bulb check	MIL can be checked.
SRT status	ECM can read if SRT codes are set.
Malfunction warning	If ECM detects a malfunction, it illuminates or blinks MIL to inform the driver that a malfunction has been detected.
Accelerator pedal released position learning	ECM can learn the accelerator pedal released position. Refer to Work Procedure.
Throttle valve closed position learning	ECM can learn the throttle valve closed position. Refer to Work Procedure.

BULB CHECK MODE

Description

This function allows damage inspection in the MIL bulb (blown, open circuit, etc.).

Operation Procedure

Turn ignition switch ON.
The MIL on the instrument panel should stay ON.

If it remains OFF, check MIL circuit. Refer to Diagnosis Procedure.

SRT STATUS MODE

Description

This function allows to read if ECM has completed the self-diagnoses of major emission control systems and components. For SRT, Refer to Diagnosis Description.

Operation Procedure

Turn ignition switch ON and wait 20 seconds.
SRT status is indicated as shown blow.
- ECM continues to illuminate MIL if all SRT codes are set.
- ECM blinks MIL for about 10 seconds if all SRT codes are not set.

MALFUNCTION WARNING MODE

Description

In this function ECM turns on or blinks MIL when it detects a malfunction in the emission control system components and/or the powertrain control components (which affect Nissan Sentra vehicle emissions) to inform the driver that a malfunction has been detected.

Operation Procedure

Turn ignition switch ON.
Check that MIL illuminates.

If it remains OFF, check MIL circuit. Refer to Diagnosis Procedure.
Start engine and let it idle.
- For two trip detection logic diagnoses, ECM turns on MIL when it detects the same malfunction twice inthe two consecutive driving cycles. (2 trip detection logic diagnoses)
- For 1st trip detection logic diagnoses, ECM turns on MIL when it detects a malfunction in one driving cycle.
- ECM blinks MIL when it detects a malfunction that may damage the three way catalyst (misfire).

Consult Function

Diagnosis Description

Diagnosis Description

FUNCTION

Diagnostic test mode	CGW Status			Description
Diagnostic test mode	Restricted Mode	Diag Test Mode	Open Mode	Description
Self Diagnostic Result	Display	Display	Display	Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data can be read and erased quickly.^*1
CGW Information^*2	Display^*2	Display^*2	Display^*2	Display the current CGW mode^2 Enables CGW to switch mode^2
Data Monitor	Display	Display	Display	Input/Output data in the ECM can be read.
Work Support^*2	Non-display^*2	Non-display^*2	Display^*2	This mode enables a technician to adjust some devices faster and more accurately by following the indications on the CONSULT unit.
Active Test^*2	Non-display^*2	Display^*2	Display^*2	Diagnostic Test Mode in which CONSULT drives some actuators apart from the ECMs and also shifts some parameters in a specified range.
DTC Work Support	Non-display	Display	Display	The status of system monitoring tests and the self-diagnosis status/result can be confirmed.
ECU Identification	Display	Display	Display	ECM part number can be read.
Network-DTC	Display	Display	Display	Display network DTC which ECM memorizes when performing "Diagnosis (All System)"

*1: The following emission-related diagnostic information is cleared when the ECM memory is erased.

DTC (Diagnostic trouble codes)
1st trip diagnostic trouble codes
Freeze frame data
1st trip freeze frame data
System readiness test (SRT) codes
Test values

*2: In some Nissan Sentra vehicles, it is not malfunctioning in case of no display of "CGW Information". In this case, it is not necessary to switch the CGW status. In Nissan Sentra vehicles where "CGW information" is not displayed, "Work Support" and "Active Test" are always displayed.

SELF DIAGNOSTIC RESULT MODE

Self Diagnostic Item

Regarding items of DTC and 1st trip DTC, Refer to DTC Index.

How to Read DTC and 1st Trip DTC

DTCs and 1st trip DTCs related to the malfunction are displayed in “Self-diag results” mode with CONSULT. “TIME” indicates the number of driving the Nissan Sentra vehicle after the last detection of DTC.

When ECM has detected a current DTC, “0” is displayed for “TIME”.
When ECM memorizes a 1st trip DTC, “1t” is displayed for “TIME”.
If “TIME” is neither “0” nor “1t”, the DTC occurred in the past.

How to Erase DTC

Note:

If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again.

Select “ENGINE” with CONSULT.
Select “SELF-DIAG RESULTS” mode.
Touch “ERASE”. (DTC in ECM will be erased.)

Freeze Frame Data and 1st Trip Freeze Frame Data

Freeze frame data item*¹	Description
DIAG TROUBLE CODE [PXXXX]	The engine control component part/control system has a trouble code displayed as PXXXX. (Refer to DTC Index.)
CAL/LD VALUE [%]	The calculated load value at the moment a malfunction is detected is displayed.
COOLANT TEMP [°C]	The engine coolant temperature at the moment a malfunction is detected is displayed.
L-FUEL TRM-B1 [%]	“Long-term fuel trim” at the moment a malfunction is detected is displayed. The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule than short-term fuel trim.
L-FUEL TRM-B2 [%]
S-FUEL TRM-B1 [%]	“Short-term fuel trim” at the moment a malfunction is detected is displayed. The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel schedule.
S-FUEL TRM-B2 [%]
ENGINE SPEED [rpm]	The engine speed at the moment a malfunction is detected is displayed.
VEHICL SPEED [km/h] or [mph]	The Nissan Sentra vehicle speed at the moment a malfunction is detected is displayed.
ABSOL TH·P/S [%]	The throttle valve opening angle at the moment a malfunction is detected is displayed.
INT/A TEMP SE [°C] or [°F]	The intake air temperature at the moment a malfunction is detected is displayed.
FUEL SYS-B1	“Fuel injection system status” at the moment a malfunction is detected is displayed. One of the following mode is displayed. MODE 2: Open loop due to detected system malfunction MODE 3: Open loop due to driving conditions (power enrichment, deceleration enleanment) MODE 4: Closed loop - using oxygen sensor(s) as feedback for fuel control MODE 5: Open loop - has not yet satisfied condition to go to closed loop
FUEL SYS-B2
INT MANI PRES [kPa]	Constant value is displayed. These items are displayed but are not applicable to this model.
COMBUST CONDITION
FUEL RAIL PRESSURE [MPa]	The fuel rail pressure at the moment a malfunction is detected is displayed.
TARGET FUEL RAIL PRESSURE [MPa]	The target fuel rail pressure at the moment a malfunction is detected is displayed.
BATTERY VOLTAGE [V]	The battery voltage at the moment a malfunction is detected is displayed.
FUEL LEVEL [%]	The fuel level at the moment a malfunction is detected is displayed.
ODO/TRIP METER [km]	ODO/TRIP meter at the moment a malfunction is detected is displayed.
DTC count	—
B/FUEL SCHDL [msec]	The basic injection quantity at the moment a malfunction is detected is displayed.

*1: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE

Note:

The following table includes information (items) inapplicable to this Nissan Sentra vehicle. For information (items) applicable to this vehicle, refer to CONSULT display items.
For reference values of the following items, Refer to Physical Values.

Monitored Item

Monitored item	Unit	Monitor Item Selection			Description	Remarks
Monitored item	Unit	ECU INPUT SIGNALS	MAIN SIGNALS	Start/Stop error	Description	Remarks
COOLANT TEMP/S	°C	×	×		The engine coolant temperature (determined by the signal voltage of the engine outlet coolant temperature sensor) is displayed.	When the engine coolant temperature sensor is open or short-circuited, ECM enters fail-safe mode.The engine coolant temperature determined by the ECM is displayed.
VHCL SPEED SE	km/h or mph	×	×		The Nissan Sentra vehicle speed computed from the vehicle speed signal sent from combination meter is displayed.
BATTERY VOLT	V				The power supply voltage of ECM is displayed.
EGR TEMP SEN
INT/A TEMP SE	°C or °F	×	×		The intake air temperature (determined by the signal voltage of the intake air temperature sensor) is indicated.
IGN TIMING	BTDC				Indicates the ignition timing computed by ECM according to the input signals.	When the engine is stopped, a certain value is indicated.
PURG VOL C/V	%				Indicates the control value of the EVAP canister purge volume control solenoid valve computed by the ECM according to the input signals. The opening becomes larger as the value increases.
FUEL T/TMP SE	°C or °F	×			The fuel temperature (determined by the signal voltage of the fuel tank temperature sensor) is displayed.
CAL/LD VALUE	%				“Calculated load value” indicates the value of the current air flow divided by peak air flow.
HO2S2 (B1)	V	×	×		The signal voltage of the heated oxygen sensor 2 is displayed.
ENG OIL TEMP	°C or °F				The engine oil temperature (determined by the signal voltage of the engine oil temperature sensor) is displayed.	—
A/F ALPHA-B1	%				The mean value of the air-fuel ratio feedback correction factor per cycle is indicated.	When the engine is stopped, a certain value is indicated. This data also includes the data for the air-fuel ratio learning control. Specification value is indicated on monitor screen under the following conditions. Reference: Select Display type: Line graph
MAP SENSOR	V				The atmospheric pressure sensor signal voltage is displayed.	—
FUEL INJ TIM	BTDC				Indicates the fuel injection timing computed by ECM according to the input signals.	—
EXH/V TIM B1	°CA				Indicates [°CA] of exhaust camshaft advance angle.	—
EGR VALVE POSITION	deg				Indicates the EGR volume control valve angle	—
FAN DUTY	%				Indicates a command value for cooling fan. The value is calculated by ECM based on input signals.	—
THRTL STK CNT B1	—				Note: These items are displayed but are not applicable to this model.	—
A/GRLL SHTTR POSITION	F/CLOSE MOVING F/OPEN UNIDTF				Indicates the status of active grille shutter. F/CLOSE: Active grille shutter is fully closed. MOVING: Active grille shutter is in motion. F/OPEN: Active grille shutter is fully opened. UNIDTF: Unable to specify the shutter position.	—
ENG SPEED	rpm	×	×		Indicates the engine speed computed from the signal of the crankshaft position sensor and camshaft position sensor.	Accuracy becomes poor if engine speed drops below the idle rpm.
TRVL AFTER MIL	km or mile				Distance traveled while MIL is activated.	—
B/FUEL SCHDL	ms	×	×		“Base fuel schedule”indicates the fuel injection pulse width programmed into ECM, prior to any learned on board correction.	Specification value is indicated on monitor screen under the following conditions. Reference: Select Display type: Line graph
MASS AIRFLOW	g/s				Indicates the mass air flow computed by ECM according to the mass air flow sensor signal.	—
FUEL PRES SEN	MPa				Indicates the fuel rail pressure computed by ECM according to the input signals.	—
ACCEL SEN 1	V				The signal voltage of the accelerator pedal position sensor 1 is displayed.	—
ACCEL SEN 2	V				The converted value of the accelerator pedal position sensor signal voltage is displayed.	ACCEL SEN 2 signal is converted by ECM internally. Thus, they differs from ECM terminal voltage signal.
TP SEN 1-B1	V	×	×		The signal voltage of the throttle position sensor 1 B1 is displayed.	—
TP SEN 2-B1	V	×	×		The value converted from the signal voltage of the throttle position sensor 2 B1 is displayed.	TP SEN 2-B1 signal is converted by ECM internally. Thus, they differs from ECM terminal voltage signal.
I/P PULLY SPD	rpm				Indicates the engine speed computed from the input shaft revolution signal.
Nissan Sentra Vehicle SPEED	km/h or mph				The Nissan Sentra vehicle speed computed from the vehicle speed signal sent from TCM is displayed.
TUMBLE POS SEN	V				The intake manifold runner control valve position sensor signal voltage is displayed.
AC PRESS SEN	V				The signal voltage from the refrigerant pressure sensor is displayed.
A/F SEN1 (B1)	V	×	×		The A/F signal voltage computed from the input signal of the air fuel ratio (A/F) sensor 1 is displayed.
VHCL SPEED SE	km/h or mph				The Nissan Sentra vehicle speed computed from the vehicle speed signal sent from combination meter is displayed.
SET VHCL SPD	km/h or mph				The preset Nissan Sentra vehicle speed is displayed.
VTC DTY EX B1	%				The control value of the exhaust valve timing control solenoid valve (determined by ECM according to the input signals) is indicated. The advance angle becomes larger as the value increases.
BAT CUR SEN	V				The signal voltage from the battery temperature sensor is displayed.
A/F ADJ-B1	—				Indicates the correction of a factor stored in ECM. The factor is calculated from the difference between the target air-fuel ratio stored in ECM and the air-fuel ratio calculated from A/F sensor 1 signal.
INT/V TIM(B1)	°CA				Indicates [°CA] of intake camshaft advance angle.
H/P FUEL PUMP DEG	deg				Displays ECM-calculated fuel discharge position of the high pressure fuel pump.
FUEL PRES SEN V	mV				The signal voltage of FRP sensor is displayed.
EOP SENSOR	mV				The signal voltage of EOP sensor is displayed.
ECM TEMP 1	°C				Displays a temperature calculated from a signal of ECM temperature sensor 1.
ECM TEMP 2	°C				Displays a temperature calculated from a signal of ECM temperature sensor 2.
STRT OPRTN CNTR	count				Starter motor operation counter is displayed.	Indicated multiplication value of the starter motor operation of key switch operation and the restart.
Mass air flow sensor (HZ) B1	Hz				The signal frequency of the mass air flow sensor is displayed.
EGR VALVE POSITION SEN	V				The signal voltage of EGR volume control valve position sensor is displayed.
LOAD SIGNAL	On/Off	×	×		Indicates [On/Off] condition of the electrical load signal. ON...Rear window defogger switch is ON or lighting switch is in 2nd position. OFF...Both rear window defogger switch and lighting switch are OFF.	—
AIR COND SIG	On/Off	×	×		Indicates [On/Off] condition of the air conditioner switch as determined by the air conditioner signal.	—
PW/ST SIGNAL	On/Off	×	×		Indicates [On/Off] condition of the power steering system (determined by the signal voltage of the power steering pressure sensor signal).	—
P/N POSI SW	On/Off	×	×		Indicates [On/Off] condition from the reverse/neutral position signal.	—
START SIGNAL	On/Off				Indicates start signal status [On/Off] computed by the ECM according to the signals of engine speed and battery voltage.	After starting the engine, [Off] is displayed regardless of the starter signal.
CLSD THL POS	On/Off	×	×		Indicates idle position [On/Off] computed by ECM according to the accelerator pedal position sensor signal.	—
HO2S2 MNTR(B1)	RICH/LEAN		×		Display of heated oxygen sensor 2 signal: RICH: means the amount of oxygen after three way catalyst is relatively small. LEAN: means the amount of oxygen after three way catalyst is relatively large.	When the engine is stopped, a certain value is indicated.
IGNITION SW	On/Off	×	×		Indicates [On/Off] condition from ignition switch signal.	—
HEATER FAN SW	On/Off	×			Indicates [On/Off] condition from the heater blower ON signal.	—
IDL A/V LEARN	YET/CMPLT				Displays the condition of Idle Air Volume Learning. YET...Idle air volume learning has not been performed yet. DONE...Idle air volume learning has already been performed successfully.	—
BRAKE SW	On/Off				Indicates [On/Off] condition from the stop lamp switch signal.	—
COMBUSTION					Note: These items are displayed but are not applicable to this model.	—
SWRL CONT S/V^*	On/Off				The control condition of the intake manifold runner control valve (determined by ECM according to the input signals) is indicated. ON: Closed OFF: Open	—
AIR COND RLY	On/Off				The air conditioner relay control condition (determined by ECM according to the input signals) is indicated.	—
FUEL PUMP RLY	On/Off				Indicates the fuel pump relay control condition determined by ECM according to the input signals.	—
VENT CONT/V	On/Off		×		The control condition of the EVAP canister vent control valve (determined by ECM according to the input signals) is indicated. ON: Closed OFF: Open	—
THRTL RELAY	On/Off				Indicates the throttle control motor relay control condition determined by the ECM according to the input signals.	—
HO2S2 HTR (B1)	On/Off				Indicates [On/Off] condition of heated oxygen sensor 2 heater determined by ECM according to the input signals.	—
BRAKE SW2 (Stop lamp switch)	On/Off				Indicates [On/Off] condition of stop lamp switch signal.	—
BRAKE SW1 (Brake pedal position switch)	On/Off				Indicates [On/Off] condition from brake pedal position switch signal.	—
SET SW	On/Off				Indicates [On/Off] condition from SET − switch signal.	—
RESUME/ACC SW	On/Off				Indicates [On/Off] condition from RES + switch signal.	—
CANCEL SW	On/Off				Indicates [On/Off] condition from CANCEL switch signal.	—
MAIN SW	On/Off				Indicates [On/Off] condition from MAIN switch signal.	—
SET LAMP	On/Off				Indicates [On/Off] condition of SET indicator determined by the ECM according to the input signals.	—
CRUISE LAMP	On/Off				Indicates [On/Off] condition of CRUISE indicator determined by the ECM according to the input signals.
A/GRLL SHTTR CALIBRATION	INCMP/ CMPLT				Indicates initial position learning status of active grille shutter. CMPLT: The leaning is complete. INCOMP: The learning is incomplete.
A/GRLL SHTTR CIRCUIT DIAG	OK/NG				Indicates the diagnosis result of active grille shutter circuit. OK: Normal. NG: Malfunction detected.
A/GRLL SHTTR TEMP DIAG	OK/NG				Indicates the diagnosis result of active grille shutter actuator temperature status. OK: Normal. NG: Abnormal temperature detected.
A/GRLL SHTTR OVER RUN	OK/NG				Indicates active grille shutter moves beyond normal moving limit. OK: Normal. NG: Malfunction detected.
A/GRLL SHTTR STUCK	OK/NG				Indicates the diagnosis result of active grille shutter stuck or the operation range less than normal. OK: Normal. NG: Malfunction detected.
A/GRLL SHTTR CALIB DIAG	OK/NG				Indicates the diagnosis result of initial position learning of active grille shutter. OK: Normal. NG: Deficiency detected.
HO2 S2 DIAG2 (B1)	INCMP/CMPLT				Indicates DTC P0139 self-diagnosis (slow response) condition. INCMP: Self-diagnosis is incomplete. CMPLT: Self-diagnosis is complete.
A/F SEN1 DIAG2(B1)	INCMP/CMPLT				Indicates DTC P014C or P014D self-diagnosis condition. INCMP: Self-diagnosis is incomplete. CMPLT: Self-diagnosis is complete.
FUEL LEVEL SE	V				The signal voltage of the fuel level sensor is displayed.	—
EVAP SYS PRES	V				The signal voltage of EVAP control system pressure sensor is displayed.	—
CAL/LD VALUE	%				“Calculated load value” indicates the value of the current air flow divided by peak air flow.	—
HO2S2 (B1)	V				The signal voltage of the heated oxygen sensor 2 is displayed.	—
ENG OIL TEMP	°C°F				The engine oil temperature (determined by the signal voltage of the engine oil temperature sensor) is displayed.	—
A/F ALPHA-B1	%				The mean value of the air-fuel ratio feedback correction factor per cycle is indicated.	When the engine is stopped, a certain value is indicated. This data also includes the data for the air-fuel ratio learning control. Specification value is indicated on monitor screen under the following conditions. Reference: Select Display type: Line graph
MAP SENSOR	V				The atmospheric pressure sensor signal voltage is displayed.
A/F S1 HTR (B1)	%				Indicates the duty ratio of the Air fuel ratio (A/ F) sensor 1 heater computed by ECM according to the input signals. The current flow to the heater becomes larger as the value increases.
EXH/V TIM B1	°CA				Indicates [°CA] of exhaust camshaft advance angle.
EGR VALVE POSITION	deg				Indicates the EGR volume control valve angle
FAN DUTY	%				Indicates a command value for cooling fan. The value is calculated by ECM based on input signals.
THRTL STK CNT B1	—				Note: These items are displayed but are not applicable to this model.
A/GRLL SHTTR POSITION	F/CLOSE MOVING F/OPEN UNIDTF				Indicates the status of active grille shutter. F/CLOSE: Active grille shutter is fully closed. MOVING: Active grille shutter is in motion. F/OPEN: Active grille shutter is fully opened. UNIDTF: Unable to specify the shutter position.
ENG SPEED	rpm				Indicates the engine speed computed from the signal of the crankshaft position sensor and camshaft position sensor.	Accuracy becomes poor if engine speed drops below the idle rpm.
TRVL AFTER MIL	km or mile				Distance traveled while MIL is activated.
B/FUEL SCHDL	ms				“Base fuel schedule” indicates the fuel injection pulse width programmed into ECM, prior to any learned on board correction.	Specification value is indicated on monitor screen under the following conditions. Reference: Select Display type: Line graph
MASS AIRFLOW	g/s				Indicates the mass air flow computed by ECM according to the mass air flow sensor signal.	—
FUEL PRES SEN	Mpa				Indicates the fuel rail pressure computed by ECM according to the input signals.	—
ACCEL SEN 1	V				The signal voltage of the accelerator pedal position sensor 1 is displayed.	—
ACCEL SEN 2	V				The converted value of the accelerator pedal position sensor signal voltage is displayed.	ACCEL SEN 2 signal is converted by ECM internally. Thus, they differs from ECM terminal voltage signal.
TP SEN 1-B1	V				The signal voltage of the throttle position sensor 1 B1 is displayed.	—
TP SEN 2-B1	V				The value converted from the signal voltage of the throttle position sensor 2 B1 is displayed.	TP SEN 2-B1 signal is converted by ECM internally. Thus, they differs from ECM terminal voltage signal.
I/P PULLY SPD	rpm				Indicates the engine speed computed from the input shaft revolution signal.	—
Nissan Sentra Vehicle SPEED	km/h or mph				The Nissan Sentra vehicle speed computed from the vehicle speed signal sent from TCM is displayed.	—
TUMBLE POS SEN	V				The intake manifold runner control valve position sensor signal voltage is displayed.	—
AC PRESS SEN	V				The signal voltage from the refrigerant pressure sensor is displayed.	—
A/F SEN1 (B1)	V				The A/F signal voltage computed from the input signal of the air fuel ratio (A/F) sensor 1 is displayed.	—
VHCL SPEED SE	km/h or mph				The Nissan Sentra vehicle speed computed from the vehicle speed signal sent from combination meter is displayed.	—
VTC DTY EX B1	%				The control value of the exhaust valve timing control solenoid valve (determined by ECM according to the input signals) is indicated. The advance angle becomes larger as the value increases.	—
A/F ADJ-B1	—				Indicates the correction of a factor stored in ECM. The factor is calculated from the difference between the target air-fuel ratio stored in ECM and the air-fuel ratio calculated from A/F sensor 1 signal.	—
H/P FUEL PUMP DEG	deg				Displays ECM-calculated fuel discharge position of the high pressure fuel pump.	—
FUEL PRES SEN V	mV				The signal voltage of FRP sensor is displayed.	—
EOP SENSOR	mV				The signal voltage of EOP sensor is displayed.	—
ECM TEMP 1	°C				Displays a temperature calculated from a signal of ECM temperature sensor 1.	—
ECM TEMP 2	°C				Displays a temperature calculated from a signal of ECM temperature sensor 2.	—
Mass air flow sensor (HZ) B1	Hz				The signal frequency of the mass air flow sensor is displayed.	—
EGR VALVE POSITION SEN	V				The signal voltage of EGR volume control valve position sensor is displayed.	—
TOTAL DISTNC-OCS RST 1	Km				Total travel distance of odd meter when Oil Control System is reset.	—
TOTAL DISTNC-OCS RST 2	Km				Total travel distance of odd meter when Oil Control System is reset. (two times ago)	—
TOTAL DISTNC-OCS RST 3	Km				Total travel distance of odd meter when Oil Control System is reset. (three times ago)	—
DETERIORTN VL -OCS RST 1	—				Indicates deterioration condition of the engine oil when Oil Control System is reset.	—
DETERIORTN VL -OCS RST 2	—				Indicates deterioration condition of the engine oil when Oil Control System is reset. (two times ago)	—
DETERIORTN VL -OCS RST 3	—				Indicates deterioration condition of the engine oil when Oil Control System is reset. (two times ago)	—
TOTAL DISTNC-OCS WRN 1	Km				Total travel distance of odd meter when Oil Control System remaining distance is zero.	—
TOTAL DISTNC-OCS WRN 2	Km				Total travel distance of odd meter when Oil Control System remaining distance is zero. (two times ago)	—
TOTAL DISTNC-OCS WRN 3	Km				Total travel distance of odd meter when Oil Control System remaining distance is zero. (two times ago)	—
DETERIORTN VL-OCS WRN 1	—				Indicates deterioration condition of the engine oil when Oil Control System remaining distance is zero.	—
DETERIORTN VL-OCS WRN 2	—				Indicates deterioration condition of the engine oil when Oil Control System remaining distance is zero. (two times ago)	—
DETERIORTN VL-OCS WRN 3	—				Indicates deterioration condition of the engine oil when Oil Control System remaining distance is zero. (three times ago)	—
CURRENT DETERIORATN VAN	—				Indicates deterioration condition of the engine oil.	—
EVAP LEAK DIAG	YET/CMPLT				Indicates the condition of EVAP leak diagnosis. YET: EVAP leak diagnosis has not been performed yet. CMPLT: EVAP leak diagnosis has been performed successfully.	—
EVAP DIAG READY	ON/OFF				Indicates the ready condition of EVAP leak diagnosis. ON: Diagnosis has been ready condition. OFF: Diagnosis has not been ready condition.	—
SYSTEM 1 DIAGNOSIS A B1	INCMP/CMPLT				Indicates DTC P219A self-diagnosis condition. INCMP: Self-diagnosis is incomplete. CMPLT: Self-diagnosis is complete.	—
A/F SEN DIAG 1(B1)	INCMP/CMPLT				Indicates DTC P015A or P015B self-diagnosis condition. INCMP: Self-diagnosis is incomplete. CMPLT: Self-diagnosis is complete.	—
A/F SEN1 DIAG2(B1)	INCMP/CMPLT				Indicates DTC P014C or P014D self-diagnosis condition. INCMP: Self-diagnosis is incomplete. CMPLT: Self-diagnosis is complete.	—
SYSTEM 1 DIAGNOSIS B B1	ABSNT/PRSNT				Indicates DTC P219A self-diagnosis condition. ABSNT: Self-diagnosis standby PRSNT: Under self-diagnosis	—
A/F SEN1 DIAG3(B1)	ABSNT/PRSNT				Indicates DTC P014C, P014D, P015A or P015B self-diagnosis condition. ABSNT: The Nissan Sentra vehicle condition is not within the diagnosis range. PRSNT: The vehicle condition is within the diagnosis range.	—
Ignition timing 2	deg				Indicates the ignition timing computed by ECM according to the input signals. Note: Indicates degree from BTDC (Before Top Dead Center) of compression stroke.	—
Di timing SOI multi inj step1	BTDC				These items are displayed but not used.	—
Di inj pules B1	msec				Indicates VCR control shaft 2 angle.	—
Driver's seat belt switch	OK/NG			×	When the malfunction of the Driver's seat belt switch is judged, OK or NG is displayed.	—
Engine parts	OK/NG			×	When the malfunction of engine parts related to the idle start/stop system is judged, OK or NG is displayed.	—
ABS error	OK/NG			×	When an ABS abnormality is received from the ABS actuator and electric unit, NG is displayed.	—
TCM error A	OK/NG			×	When an CVT abnormality is received from the TCM, NG is displayed.	—
TCM error B	OK/NG			×	When an DTC abnormality is received from the TCM, NG is displayed.	—
VDC error	OK/NG			×	When an VDC abnormality is received from the ABS actuator and electric unit, NG is displayed.	—
IPDM error	OK/NG			×	When an abnormal voltage status is received from the IPDM E/R, NG is displayed.	—
CAN comm (VDC) A	OK/NG			×	When the communication status with the ABS actuator and electric unit is judged, OK or NG is displayed.	—
CAN comm (VDC) B	OK/NG			×	When the communication status with the ABS actuator and electric unit is judged, OK or NG is displayed.	—
CAN comm (VDC) C	OK/NG			×	When VDC is judged based on the communication status with the ABS actuator and electric unit, OK or NG is displayed.	—
CAN comm (VDC) D	OK/NG			×	When VDC is judged based on the communication status with the ABS actuator and electric unit, OK or NG is displayed.	—
CAN comm (VDC) E	OK/NG			×	When VDC is judged based on the communication status with the ABS actuator and electric unit, OK or NG is displayed.	—
CAN comm (VDC) F	OK/NG			×	When VDC is judged based on the communication status with the ABS actuator and electric unit, OK or NG is displayed.	—
CAN comm (VDC) G	OK/NG			×	When VDC is judged based on the communication status with the ABS actuator and electric unit, OK or NG is displayed.	—
CAN comm (VDC) H	OK/NG			×	When VDC is judged based on the communication status with the ABS actuator and electric unit, OK or NG is displayed.	—
CAN comm (TCM) A	OK/NG			×	When A/T is judged based on the communication status with the TCM, OK or NG is displayed.	—
CAN comm (TCM) B	OK/NG			×	When CVT is judged based on the communication status with the TCM, OK or NG is displayed.	—
CAN comm (TCM) C	OK/NG			×	When A/T is judged based on the communication status with the TCM, OK or NG is displayed.	—
CAN comm (TCM) D	OK/NG			×	When CVT is judged based on the communication status with the TCM, OK or NG is displayed.	—
CAN comm (TCM) E	OK/NG			×	When A/T is judged based on the communication status with the TCM, OK or NG is displayed.	—
CAN comm (BCM) A	OK/NG			×	When the communication status with the BCM is judged, OK or NG is displayed.	—
CAN comm (BCM) B	OK/NG			×	When the communication status with the BCM is judged, OK or NG is displayed.	—
CAN comm (BCM) C	OK/NG			×	When the communication status with the BCM is judged, OK or NG is displayed.	—
CAN comm (BCM) D	OK/NG			×	When the communication status with the BCM is judged, OK or NG is displayed.	—
CAN comm (BCM) E	OK/NG			×	When the communication status with the BCM is judged, OK or NG is displayed.	—
CAN comm (IPDM) A	OK/NG			×	When the communication status with the IPDM E/R is judged, OK or NG is displayed.	—
CAN comm (IPDM) B	OK/NG			×	When the communication status with the IPDM E/R is judged, OK or NG is displayed.	—
CAN comm (IPDM) C	OK/NG			×	When the communication status with the IPDM E/R is judged, OK or NG is displayed.	—
CAN comm (IPDM) D	OK/NG			×	When the communication status with the IPDM E/R is judged, OK or NG is displayed.	—
CAN comm (IPDM) E	OK/NG			×	When the communication status with the IPDM E/R is judged, OK or NG is displayed.	—
Starter motor relay	OK/NG			×	When the malfunction of the ST/IS relay is judged, OK or NG is displayed.	—
Neutral switch	OK/NG			×	When the malfunction of the neutral switch is judged, OK or NG is displayed.	—
CAN comm (EPS)	OK/NG			×	When the communication status with the steering control module is judged, OK or NG is displayed.	—
Negative pressure	OK/NG			×	When the brake booster pressure sensor status is judged, OK or NG is displayed.	—

WORK SUPPORT MODE

Work Item

Work item	Condition	Usage
STRT OPRTN CNTR CLEAR	In this mode, Starter motor operation counter is cleared.	After replacing starter motor
CML B/DCHRG CRNT CLEAR	In this mode, cumulative main battery discharge current is cleared.	When main battery is replaced.
FUEL PRESSURE RELEASE	Fuel pump will stop by touching “START” during idling. Crank a few times after engine stops.	When releasing fuel pressure from fuel line
TARGET IGN TIM ADJ	Idle condition	When adjusting target ignition timing
TARGET IDLE RPM ADJ	Idle condition	When setting target idle speed
SAVING DATA FOR REPLC CPU	In this mode, save data that is in ECM.	When ECM is replaced.
WRITING DATA FOR REPLC CPU	In this mode, write data stored by “SAVE DATA FOR CPU REPLC” in work support mode to ECM.	When ECM is replaced.
IDLE AIR VOL LEARN	The idle air volume that keeps the engine speed within the specified range is memorized in ECM.	When learning the idle air volume
CLSD THL POS LEARN	Ignition switch ON and engine stopped.	When learning the throttle valve closed position
SELF-LEARNING CONT	The coefficient of self-learning control mixture ratio returns to the original coefficient.	When clearing mixture ratio self-learning value.
VIN REGISTRATION	In this mode, VIN is registered in ECM.	When registering VIN in ECM
EGR control valve closed position learning	Ignition switch ON and engine stopped.	When learning the EGR volume control valve closed position
Electric intake valve timing control learning	Ignition switch ON and engine stopped.	After the following parts are replaced. Electric intake valve timing control actuator Electric intake valve timing control module camshaft, timing chain, camshaft sprocket piston, connecting rod, crankshaft position sensor
EVAP SYSTEM CLOSE	Close the EVAP canister vent control valve in order to make EVAP system close under the following conditions. Ignition switch ON Engine not running Ambient temperature is above 0°C (32°F) No vacuum and no high pressure in EVAP system Fuel tank temperature is more than 0°C (32°F) Within 10 minutes after starting “EVAP SYSTEM CLOSE” When trying to execute “EVAP SYSTEM CLOSE” under the condition except above, CONSULT will discontinue it and display appropriate instruction Note: When starting engine, CONSULT may display “Battery voltage is low. Charge battery”, even in using charged battery.	When detecting EVAP vapor leak point of EVAP system
Misfire ciunt (real-time)	These items are displayed but not used.	—
Misfire ciunt (past)	These items are displayed but not used.	—
Stop/Start prohibit cause data recorder	Ignition switch: ON (Engine stopped)	Indicates the reason that idle start/stop system does not operate when Nissan Sentra vehicle is stopped on CONSULT.
Stop/Start engine restart cause data recorder	Ignition switch: ON (Engine stopped)	Indicates the reason that engine is stalled on CONSULT.
Stop/Start engine stall cause data recorder	Ignition switch: ON (Engine stopped)	Indicates the reason that engine is restarted when idle start/stop system operates on CONSULT.

ACTIVE TEST MODE

Test Item

TEST ITEM	CONDITION	JUDGMENT	CHECK ITEM (REMEDY)
AUTO STOP START	Engine: After warming up, run engine at idle Selector lever: N or P “Start” and “Cancel” using CONSULT	Check the idle start/stop system operate and restart.	Harness and connectors IPDM E/R Starter motor Starter control relay
AUTO STOP START	CAUTION: Be careful so that a hood operates in the opened state when carry out work. Shift the select lever position to “P” position, because operate regardless of the brake pedal position.
ENG COOLANT TEMP	Change the engine coolant temperature using CONSULT.	If malfunctioning symptom disappears, see CHECK ITEM.	Harness and connectors Engine coolant temperature sensor Fuel injector
FUEL INJECTION	Change the amount of fuel injection using CONSULT.	If malfunctioning symptom disappears, see CHECK ITEM.	Harness and connectors Fuel injector Air fuel ratio (A/F) sensor 1
IGNITION TIMING	Timing light: Set Retard the ignition timing using CONSULT.	If malfunctioning symptom disappears, see CHECK ITEM.	Perform Idle Air Volume Learning.
PURG VOL CONT/V	Engine: After warming up, run engine at 1,500 rpm. Change the EVAP canister purge volume control solenoid valve opening percent using CONSULT.	Engine speed changes according to the opening percent.	Harness and connectors EVAP canister purge volume control solenoid valve
POWER BALANCE	Engine: After warming up, idle the engine. A/C switch OFF Selector lever: N position (CVT models), Neutral position (M/T models) Cut off each injector signal one at a time using CONSULT.	Engine runs rough or stops. (Works for accidental fire.)	Harness and connectors Compression Fuel injector Power transistor Spark plug Ignition coil
INT V/T ASSIGN ANGLE	Changes intake valve timing using CONSULT.	If malfunctioning symptom disappears, see CHECK ITEM.	Harness and connectors Intake valve timing control solenoid valve
EXT V/T ASSIGN ANGLE	Changes exhaust valve timing using CONSULT.	If malfunctioning symptom disappears, see CHECK ITEM.	Harness and connectors Exhaust valve timing control solenoid valve
EGR CONTROL VALVE	Ignition switch: ON (Engine stopped) EGR volume control valve opening changes using CONSULT.	EGR volume control valve changes according to the target valve opening (0° – 70°)	Harness and connectors EGR volume control valve
FAN DUTY CONTROL*	Ignition switch: ON Change duty ratio using CONSULT.	Cooling fan speed changes.	Harness and connectors Cooling fan motor IPDM E/R
ACTIVE GRILLE SHUTTER	Note: Initial position learning is required every time when the ignition switch is turned OFF. Engine: Idle speed Touch “CALIBRTN” to perform initial position learning. Touch “OPEN” or “CLOSE” to operate active grille shutter.	Active grille shutter fully opens or fully closes.	Harness or connector Active grille shutter actuator Active grille shutter
FUEL PUMP RELAY	Ignition switch: ON (Engine stopped) Turn the fuel pump relay “ON” and “OFF” using CONSULT and listen to operating sound.	Fuel pump relay makes the operating sound.	Harness and connectors Fuel pump relay
TUMBLE CONTROL VALVE	Ignition switch: ON (Engine stopped) Turn the intake manifold runner control valve “ON” and “OFF” using CONSULT to open or close.	Touch the intake manifold runner control valve motor and check the operating vibration and sound.	Harness and connectors Intake manifold runner control valve Intake manifold runner control valve motor
FUEL /T TEMP SEN	Change the fuel tank temperature using CONSULT.
VENT CONTROL VALVE	Ignition switch: ON (Engine stopped) Turn EVAP canister vent control valve ON and OFF with the CONSULT and listen to operating sound.	EVAP canister vent control valve makes an operating sound.	Harness and connectors EVAP canister vent control valve

*: Leaving cooling fan OFF with CONSULT while engine is running may cause the engine to overheat.

DTC WORK SUPPORT MODE

Teat Item

Test mode	Test item	Corresponding DTC No.	Reference page
HO2S2	HO2S2 (B1) P1146	P0138	DTC Description
	HO2S2 (B1) P1147	P0137	DTC Description
	HO2S2 (B1) P0139	P0139	DTC Description
A/F SEN1	A/F SEN1 (B1) P1276	P0130	DTC Description
EVAPORATIVE SYSTEM	PURG FLOW P0441	P0441	DTC Description
EVAPORATIVE SYSTEM	PURG VOL CN/V P1444	P0443	DTC Description

SRT STATUS Mode

For items whose SRT codes are set, “CMPLT” is displayed on the CONSULT screen; for items whose SRT codes are not set, “INCMP” is displayed.
“SRT STATUS” provides the presence or absence of permanent DTCs stored in control module memory.

PERMANENT DTC STATUS Mode

How to Display Permanent DTC Status

Turn ignition switch OFF and wait at 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at 10 seconds.
Turn ignition switch ON.
Select “PERMANENT DTC STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT.
Note:
Permanent DTCs stored in control module memory are displayed on the CONSULT screen to show if a driving pattern required for erasing permanent DTCs is complete (CMPLT) or incomplete (INCMP).

CAUTION:

Since the “PERMANENT DTC STATUS” screen displays the previous trip information, repeat the following twice to update the information: “Ignition switch OFF”, “Wait for more than 10 seconds” and “Ignition switch ON”.

Note:

This mode is not used in regions that permanent DTCs are not regulated by law.

SRT WORK SUPPORT Mode

This mode enables a technician to drive a Nissan Sentra vehicle to set the SRT while monitoring the SRT status.

PERMANENT DTC WORK SUPPORT Mode

This mode enables a technician to drive a Nissan Sentra vehicle to complete the driving pattern that is required for erasing permanent DTC.

Note:

This mode is not used in regions that permanent DTCs are not regulated by law.

SRT STATUS Mode

For items whose SRT codes are set, “CMPLT” is displayed on the CONSULT screen; for items whose SRTcodes are not set, “INCMP” is displayed.

SRT WORK SUPPORT Mode

This mode enables a technician to drive a Nissan Sentra vehicle to set the SRT while monitoring the SRT status.

System Readiness Test (srt) Code

Diagnosis Description

Diagnosis Description

System Readiness Test (SRT) code is specified in Service $01 of SAE J1979/ISO 15031-5.

As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and components. Completion must be verified in order for the emissions inspection to proceed.

If a Nissan Sentra vehicle is rejected for a State emissions inspection due to one or more SRT items indicating “INCMP”, use the information in this Service Manual to set the SRT to “CMPLT”.

In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains “CMPLT” until the self-diagnosis memory is erased.

Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's normal driving pattern; the SRT will indicate “INCMP” for these items.

Note:

The SRT will also indicate “INCMP” if the self-diagnosis memory is erased for any reason or if the ECM memory power supply is interrupted for several hours.

If, during the state emissions inspection, the SRT indicates “CMPLT” for all test items, the inspector will continue with the emissions test. However, if the SRT indicates “INCMP” for one or more of the SRT items the Nissan Sentra vehicle is returned to the customer untested.

Note:

If MIL is ON during the state emissions inspection, the Nissan Sentra vehicle is also returned to the customer untested even though the SRT indicates “CMPLT” for all test items. Therefore, it is important to check SRT (“CMPLT”) and DTC (No DTCs) before the inspection.

SRT SET TIMING

SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRT is done regardless of whether the result is OK or NG. The set timing is different between OK and NG results and is shown in the table below.

Self-diagnosis result		Example
Self-diagnosis result		Diagnosis	Ignition cycle ← ON → OFF ← ON → OFF ← ON → OFF ← ON →
All OK	Case 1	P0400	OK (1)	— (1)	OK (2)	— (2)
		P0402	OK (1)	— (1)	— (1)	OK (2)
		P1402	OK (1)	OK (2)	— (2)	— (2)
		SRT of EGR	“CMPLT”	“CMPLT”	“CMPLT”	“CMPLT”
	Case 2	P0400	OK (1)	— (1)	— (1)	— (1)
		P0402	— (0)	— (0)	OK (1)	— (1)
		P1402	OK (1)	OK (2)	— (2)	— (2)
		SRT of EGR	“INCMP”	“INCMP”	“CMPLT”	“CMPLT”
NG exists	Case 3	P0400	OK	OK	—	—
		P0402	—	—	—	—
		P1402	NG	—	NG	NG (Consecutive NG)
		(1st trip) DTC	1st trip DTC	—	1st trip DTC	DTC (= MIL ON)
		SRT of EGR	“INCMP”	“INCMP”	“INCMP”	“CMPLT”

OK: Self-diagnosis is carried out and the result is OK.

NG: Self-diagnosis is carried out and the result is NG.

—: Self-diagnosis is not carried out.

When all SRT related self-diagnoses show OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will indicate “CMPLT”. → Case 1 above

When all SRT related self-diagnoses show OK results through several different cycles, the SRT will indicate “CMPLT” at the time the respective self-diagnoses have at least one OK result. → Case 2 above

If one or more SRT related self-diagnoses show NG results in 2 consecutive cycles, the SRT will also indicate “CMPLT”. → Case 3 above

The table above shows that the minimum number of cycles for setting SRT as “INCMP” is the number one (1) for each self-diagnosis (Case 1 & 2) or the number two (2) for one of self-diagnoses (Case 3). However, in preparation for the state emissions inspection, it is unnecessary for each self-diagnosis to be executed twice (Case 3) for the following reasons:

The SRT will indicate “CMPLT” at the time the respective self-diagnoses have one (1) OK result.
The emissions inspection requires “CMPLT” of the SRT only with OK self-diagnosis results.
During SRT driving pattern, the 1st trip DTC (NG) is detected prior to “CMPLT” of SRT and the self-diagnosis memory must be erased from the ECM after repair.
If the 1st trip DTC is erased, all the SRT will indicate “INCMP”.
Note:
SRT can be set as “CMPLT” together with the DTC(s). Therefore, DTC check must always be carried out prior to the state emission inspection even though the SRT indicates “CMPLT”.

Dtc and Freeze Frame Data

Diagnosis Description

Diagnosis Description

DTC AND 1ST TRIP DTC

The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not recur, the 1st trip DTC will not be displayed.

If a malfunction is detected during the 1st trip, the 1st trip DTC is saved in the ECM memory. The MIL will not light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the 2nd trip, both the 1st trip DTC and DTC are saved in the ECM memory and the MIL lights up. In other words, the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consecutive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the 1st trip, the DTC and 1st trip DTC are stored in the ECM memory.

For malfunctions in which 1st trip DTCs are displayed, Refer to DTC Index. These items are required by legal regulations to continuously monitor the system/component. In addition, the items monitored non-continuously are also displayed on CONSULT.

1st trip DTC is specified in Service $07 of SAE J1979/ISO 15031-5. 1st trip DTC detection occurs without illuminating the MIL and therefore does not warn the driver of a malfunction.

When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame data as specified in Work Flow procedure Step 2, Refer to Work Flow. Then perform DTC Confirmation Procedure or Component Function Check to try to duplicate the malfunction. If the malfunction is duplicated, the item requires repair.

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA

The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed, Nissan Sentra vehicle speed, absolute throttle position, base fuel schedule and intake air temperature at the moment a malfunction is detected.

Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data. The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT or GST. The 1st trip freeze frame data can only be displayed on the CONSULT screen.

Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the following priorities to update the data.

Priority	Items
1	Freeze frame data	Misfire — DTC: P0300 – P0304 Fuel Injection System Function — DTC: P0171, P0172
2	Except the above items
3	1st trip freeze frame data

Priority

Items

Freeze frame data

Misfire — DTC: P0300 – P0304

Fuel Injection System Function — DTC: P0171, P0172

Except the above items

1st trip freeze frame data

For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was saved in the 2nd trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different malfunction is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and freeze frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the ECM memory.

Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM memory is erased.

Driving Pattern

Diagnosis Description

Diagnosis Description

CAUTION:

Always drive at a safe speed.

DRIVING PATTERN A

Driving pattern A means a trip satisfying the following conditions.

Engine speed reaches 400 rpm or more.
Engine coolant temperature rises by 20°C (36°F) or more after starting the engine.
Engine coolant temperature reaches 70°C (158°F) or more.
The ignition switch is turned from ON to OFF.

Note:

When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern A.
When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving pattern A.

DRIVING PATTERN B

Driving pattern B means a trip satisfying the following conditions.

Engine speed reaches 400 rpm or more.
Engine coolant temperature reaches 70°C (158°F) or more.
Nissan Sentra Vehicle speed of 70 – 120 km/h (44 – 75 MPH) is maintained for 60 seconds or more under the control of closed loop.
Nissan Sentra Vehicle speed of 30 – 60 km/h (19 – 37 MPH) is maintained for 10 seconds or more under the control of closed loop.
Under the closed loop control condition, the following state reaches 12 seconds or more in total: Nissan Sentra Vehicle speed of 4 km/h (2 MPH) or less with idling condition.
The state of driving at 10 km/h (7 MPH) or more reaches 10 minutes or more in total.
A lapse of 22 minutes or more after engine start.

Note:

Drive the Nissan Sentra vehicle at a constant velocity.
When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern B.
When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving pattern B.

DRIVING PATTERN C

Driving pattern C means operating Nissan Sentra vehicle as per the following:

The following conditions should be satisfied at the same time:

Engine speed: (Engine speed in the freeze frame data) ±375 rpm

Calculated load value: (Calculated load value in the freeze frame data) x (1±0.1) [%]

Engine coolant temperature condition:

When the freeze frame data shows lower than 70°C (158°F), engine coolant temperature should be lower than 70°C (158°F).
When the freeze frame data shows higher than or equal to 70°C (158°F), engine coolant temperature should be higher than or equal to 70°C (158°F).

Note:

When the same malfunction is detected regardless of the above Nissan Sentra vehicle conditions, reset the counter of driving pattern C.
When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving pattern C.
The 1st trip DTC will be cleared when C counter is counted once without the same malfunction after DTC is stored in ECM.

DRIVING PATTERN D

Driving pattern D means a trip satisfying the following conditions.

The state of driving at 40 km/h (25 MPH) reaches 300 seconds or more in total.
Idle speed lasts 30 seconds or more.
A lapse of 600 seconds or more after engine start.

Note:

When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern D.
When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving pattern D.

Counter System

Diagnosis Description

Diagnosis Description

RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS

When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are stored in the ECM memory.
When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are stored in the ECM memory, and the MIL will come on.
The MIL will turn OFF after the Nissan Sentra vehicle is driven 3 times (driving pattern B) with no malfunction. The drive is counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs while counting, the counter will reset.
The DTC and the freeze frame data will be stored until the Nissan Sentra vehicle is driven 40 times (driving pattern A) without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injection System, the DTC and freeze frame data will be stored until the Nissan Sentra vehicle is driven 80 times (driving pattern C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC RESULTS” mode of CONSULT will count the number of times the Nissan Sentra vehicle is driven.
The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.

COUNTER SYSTEM CHART

Items	Fuel Injection System	Misfire	Other
MIL (turns OFF)	3 (pattern B)	3 (pattern B)	3 (pattern B)
DTC, Freeze Frame Data (no display)	80 (pattern C)	80 (pattern C)	40 (pattern A)
1st Trip DTC (clear)	1 (pattern C), *1	1 (pattern C), *1	1 (pattern B)
1st Trip Freeze Frame Data (clear)	1, 2	1, 2	1 (pattern B)

For details about patterns B and C under “Fuel Injection System” and “Misfire”, see “EXPLANATION FOR DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”.

For details about patterns A and B under Other, see “EXPLANATION FOR DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”.

*1: Clear timing is at the moment OK is detected.
*2: Clear timing is when the same malfunction is detected in the 2nd trip.

Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection System”

*1:	When the same malfunction is detected in two consecutive trips, MIL will light up.	*2:	MIL will turn OFF after Nissan Sentra vehicle is driven 3 times (pattern B) without any malfunctions.	*3:	When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data will be stored in ECM.
*4:	The DTC and the freeze frame data will not be displayed any longer after Nissan Sentra vehicle is driven 80 times (pattern C) without the same malfunction. (The DTC and the freeze frame data still remain in ECM.)	*5:	When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data will be stored in ECM.	*6:	The 1st trip DTC and the 1st trip freeze frame data will be cleared at the moment OK is detected.
*7:	When the same malfunction is detected in the 2nd trip, the 1st trip freeze frame data will be cleared.	*8:	1st trip DTC will be cleared when Nissan Sentra vehicle is driven once (pattern C) without the same malfunction after DTC is stored in ECM.

Explanation for Driving Patterns for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection System”

Driving Pattern B

Refer to Diagnosis Description.

Driving Pattern C

Refer to Diagnosis Description.

Example:

If the stored freeze frame data is as per the following:

Engine speed: 850 rpm, Calculated load value: 30%, Engine coolant temperature: 80°C (176°F)

To be satisfied with driving pattern C, the Nissan Sentra vehicle should run under the following conditions:

Engine speed: 475 – 1,225 rpm, Calculated load value: 27 – 33%, Engine coolant temperature: more than 70°C (158°F)

Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns Except For “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection System”

*1:

When the same malfunction is detected in two consecutive trips, MIL will light up.

*2:

MIL will turn OFF after Nissan Sentra vehicle is driven 3 times (pattern B) without any malfunctions.

*3:

When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data will be stored in ECM.

*4:

The DTC and the freeze frame data will not be displayed any longer after Nissan Sentra vehicle is driven 40 times (pattern A) without the same malfunction.

(The DTC and the freeze frame data still remain in ECM.)

*5:

When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data will be stored in ECM.

*6:

1st trip DTC will be cleared after Nissan Sentra vehicle is driven once (pattern B) without the same malfunction.

*7:

When the same malfunction is detected in the 2nd trip, the 1st trip freeze frame data will be cleared.

Explanation for Driving Patterns Except for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection System”

Driving Pattern A

Refer to Diagnosis Description.

Driving Pattern B

Refer to Diagnosis Description.

1 Trip Detection Logic and 2 Trip Detection Logic

Diagnosis Description

Diagnosis Description

When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the ECM memory. The MIL will not illuminate at this stage. <1st trip>

If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in the ECM memory, and the MIL illuminates. The MIL illuminates at the same time when the DTC is stored. <2nd trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed during Nissan Sentra vehicle operation. Specific on board diagnostic items will cause the ECM to illuminate or blink the MIL, and store DTC and Freeze Frame data, even in the 1st trip, as shown below.

×: Applicable —: Not applicable

Items	MIL				DTC		1st trip DTC
	1st trip		2nd trip		1st trip displaying	2nd trip displaying	1st trip displaying	2nd trip displaying
	Blinking	Illuminated	Blinking	Illuminated	1st trip displaying	2nd trip displaying	1st trip displaying	2nd trip displaying
Misfire (Possible three way catalyst damage) — DTC: P0300 – P0304 is being detected	×	—	—	—	—	—	×	—
Misfire (Possible three way catalyst damage) — DTC: P0300 – P0304 is being detected	—	—	×	—	—	×	—	—
One trip detection diagnoses (Refer to DTC Index.)	—	×	—	—	×	—	—	—
Except above	—	—	—	×	—	×	×	—

Malfunction Indicator Lamp (mil)

Diagnosis Description

Diagnosis Description

When emission-related ECU detects a malfunction in the emission control systems components and/or the powertrain control components (which affect Nissan Sentra vehicle emissions), it turns on/blinks MIL to inform the driver that a malfunction has been detected.

The MIL illuminates when ignition switch is turned ON (engine is not running).
Note:
Check the MIL circuit if MIL does not illuminate. Refer to Diagnosis Procedure.
When the engine is started, the MIL should go off.
Note:
If MIL continues to illuminate/blink, perform self-diagnoses and inspect/repair accordingly because an emission-related ECU has detected a malfunction in the emission control systems components and/or the powertrain control components (which affect Nissan Sentra vehicle emissions).

On Board Diagnostic (obd) System

Diagnosis Description Diagnosis Description This system is an on board diagnostic system that records exhaust emission-related diagnostic information and detects a sensors/actuator-related ...

Ecu Diagnosis Information

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Exploded View
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B2033-4a Dongle Ng
Dtc Description DTC Description DTC DETECTION LOGIC DTC No. CONSULT screen items (Trouble diagnosis content) DTC detection condition ...