Nissan Sentra B18 (2020-2025) Service Manual / Ventilation, Heater & Air Conditioner / Heater & Air Conditioning Control System :: Manual Air Conditioner / Ecu Diagnosis Information

Nissan Sentra B18 (2020-2025) Service Manual: Ecu Diagnosis Information

A/c Amp.

Values on the Diagnosis Tool

Values on the Diagnosis Tool

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.

Monitor item	Condition		Value/Status
AMB TEMP SEN	Ignition switch ON		Equivalent to ambient temperature (Display range: -40 - 215° C)
INT TEMP SEN	Ignition switch ON		Equivalent to evaporator fin temperature (Display range: -40 - 215° C) When a DTC is detected, 215°C is displayed for the value for the below Data Monitor item regardless of the cause of the malfunction.
AMB SEN CAL	Ignition switch ON		Equivalent to ambient temperature (Display range: -40 - 215° C)
INT TEMP CAL	Ignition switch ON		Equivalent to evaporator fin temperature (Display range: -40 - 215° C) When a DTC is detected, 215°C is displayed for the value for the below Data Monitor item regardless of the cause of the malfunction.
XM	Ignition switch ON		Value according to target air flow temperature (driver side) (Display range: -100 - 150)
FAN REQ SIG	Ignition switch ON	Blower motor: ON	On
FAN REQ SIG	Ignition switch ON	Blower motor: OFF	Off
FAN DUTY	Engine: Run at idle after warming up	Blower motor: ON	25 – 89% (Display range: 0 - 100%)
FAN DUTY	Engine: Run at idle after warming up	Blower motor: OFF	0
COMP REQ SIG	Ignition switch ON	A/C switch : ON	request
COMP REQ SIG	Ignition switch ON	A/C switch : OFF	not request
A/C comp clutch status	Engine: Run at idle after warming up	A/C switch : ON	On
A/C comp clutch status	Engine: Run at idle after warming up	A/C switch : OFF	Off
Cooling fan request	Ignition switch ON		Equivalent to cooling fan operation request
Rear window defogger request	Ignition switch ON	Rear window defogger switch: ON	On
Rear window defogger request	Ignition switch ON	Rear window defogger switch: OFF	Off
Eco mode request	Ignition switch ON	Drive mode: ECO	Request
Eco mode request	Ignition switch ON	Other than above	Not REQ
Illumination control duty	Ignition switch ON		Equivalent to illumination control duty
Refrigerant PRESS SEN value	Ignition switch ON		Equivalent to refrigerant pressure
Heated steering wheel request	Note: This item displayed, but cannot be monitored.
Nissan Sentra Vehicle speed	When driving the Nissan Sentra vehicle		Equivalent to speedometer reading (Display range: 0 - 120 km/h)
ODO/TRIP METER	Ignition switch ON		Equivalent to odometer reading
Engine RPM	Engine: Running		Equivalent to tachometer reading (Display range: 0 - 8191.75 rpm)
ENG COOL TEMP	Ignition switch ON		Equivalent to engine coolant temperature (Display range: -40 - 215° C)

Reference Value

Reference Value

TERMINAL LAYOUT

PHYSICAL VALUES

Terminal No. (Wire color)		Description		Condition		Value (Approx.)
+	−	Signal name	Input/Output	Condition		Value (Approx.)
1 (W)	58 (LA/B)	Door motor power supply	Output	Ignition switch ON		Battery voltage
22 (G)	58 (LA/B)	LIN1 (door motor)	Input/Output	Ignition switch ON
23 (L)	26 (LA/BR)	Intake sensor signal	Input	Ignition switch ON
26 (LA/BR)	Ground	Sensor ground 1	—	Ignition switch ON		0 V
34 (R)	58 (LA/B)	Blower motor control signal	Output	Ignition switch ON	Blower motor: OFF	Battery voltage
34 (R)	58 (LA/B)	Blower motor control signal	Output	Ignition switch ON	Blower motor: 1st speed (manual)
50 (LA/L)	—	CAN-High	Input/Output	—		—
55^* (W)	Ground	Heated seat LH high relay control	Output	Heated seat ON		0 V
55^* (W)	Ground	Heated seat LH high relay control	Output	Heated seat OFF		Battery voltage
58 (LA/B)	Ground	Ground	—	Ignition switch ON		0 V
60 (P)	58 (LA/B)	Accessory power supply	Input	Ignition switch OFF (auto ACC status) or ON		Battery voltage
60 (P)	58 (LA/B)	Accessory power supply	Input	Ignition switch OFF (not auto ACC status)		0 V
68 (LA/SB)	58 (LA/B)	LIN2 (A/C control)	Input/Output	Ignition switch ON
70 (LA/P)	—	CAN-Low	Input/Output	—		—
75^* (R)	Ground	Heated seat LH low relay control	Output	Heated seat ON		0 V
75^* (R)	Ground	Heated seat LH low relay control	Output	Heated seat OFF		Battery voltage
76^* (LG)	Ground	Heated seat RH low relay control	Output	Heated seat ON		0 V
76^* (LG)	Ground	Heated seat RH low relay control	Output	Heated seat OFF		Battery voltage
79^* (GR)	Ground	Heated seat RH high relay control	Output	Heated seat ON		0 V
79^* (GR)	Ground	Heated seat RH high relay control	Output	Heated seat OFF		Battery voltage

^{*: With heated seat
system}

Fail-Safe

Fail-safe

FAIL-SAFE FUNCTION

If a CAN communication error exists between the A/C amp., ECM, IPDM E/R, BCM and combination meter for 2 seconds or longer, air conditioning is controlled under the following conditions:

A/C compressor

: OFF

If a LIN communication error exists between the A/C amp. and A/C switch assembly for 30 seconds or longer, air conditioning is controlled under the following conditions:

A/C compressor	: Setting before communication error occurs
Air outlet	: Setting before communication error occurs
Air inlet	: Setting before communication error occurs
Blower fan speed	: Setting before communication error occurs

Dtc Inspection Priority Chart

DTC Inspection Priority Chart

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority chart:

Priority	Detected items (DTC)
1	U1010–49: CONTROL UNIT(CAN) U2140-87: CAN comm err (ECM) U2148-87: CAN comm err (brake control unit) U214E-87: CAN comm err (combination meter) U214F-87: CAN comm err (BCM) U215B-87: CAN comm err (IPDM E/R)
2	B24A4–11: INTAKE SENSOR B24A4–15: INTAKE SENSOR B24AF-12: Front heated seat relay LH (LO) B24AF-14: Front heated seat relay LH (LO) B24B0-12: Front heated seat relay LH (HI) B24B0-14: Front heated seat relay LH (HI) B24B4-02: A/C CONTROL B24BA-12: Front heated seat relay RH (LO) B24BA-14: Front heated seat relay RH (LO) B24BC-12: Front heated seat relay RH (HI) B24BC-14: Front heated seat relay RH (HI) B24D4-08: A/C CONTROL COMM B24F5-93: Mode door motor B24F6-93: Intake door motor B24F7-93: Air mix door motor 1

Priority

Detected items (DTC)

U1010–49: CONTROL UNIT(CAN)
U2140-87: CAN comm err (ECM)
U2148-87: CAN comm err (brake control unit)
U214E-87: CAN comm err (combination meter)
U214F-87: CAN comm err (BCM)
U215B-87: CAN comm err (IPDM E/R)

B24A4–11: INTAKE SENSOR
B24A4–15: INTAKE SENSOR
B24AF-12: Front heated seat relay LH (LO)
B24AF-14: Front heated seat relay LH (LO)
B24B0-12: Front heated seat relay LH (HI)
B24B0-14: Front heated seat relay LH (HI)
B24B4-02: A/C CONTROL
B24BA-12: Front heated seat relay RH (LO)
B24BA-14: Front heated seat relay RH (LO)
B24BC-12: Front heated seat relay RH (HI)
B24BC-14: Front heated seat relay RH (HI)
B24D4-08: A/C CONTROL COMM
B24F5-93: Mode door motor
B24F6-93: Intake door motor
B24F7-93: Air mix door motor 1

Dtc Index

DTC Index

Self Diagnostic Result
DTC	Items (CONSULT screen terms)	Reference
B24A4–11	INTAKE SENSOR	DTC Diagnosis Procedure
B24A4–15	INTAKE SENSOR	DTC Diagnosis Procedure
B24AF-12	Front heated seat relay LH (LO)	DTC Diagnosis Procedure
B24AF-14	Front heated seat relay LH (LO)	DTC Diagnosis Procedure
B24B0-12	Front heated seat relay LH (HI)	DTC Diagnosis Procedure
B24B0-14	Front heated seat relay LH (HI)	DTC Diagnosis Procedure
B24B4–02	A/C CONTROL	DTC Diagnosis Procedure
B24BA-12	Front heated seat relay RH (LO)	DTC Diagnosis Procedure
B24BA-14	Front heated seat relay RH (LO)	DTC Diagnosis Procedure
B24BC-12	Front heated seat relay RH (HI)	DTC Diagnosis Procedure
B24BC-14	Front heated seat relay RH (HI)	DTC Diagnosis Procedure
B24D4-08	A/C CONTROL COMM	DTC Diagnosis Procedure
B24F5-93	Mode door motor	DTC Diagnosis Procedure
B24F6-93	Intake door motor	DTC Diagnosis Procedure
B24F7-93	Air mix door motor 1	DTC Diagnosis Procedure
U1010–49	CONTROL UNIT(CAN)	DTC Diagnosis Procedure
U2140-87	CAN comm err (ECM)	DTC Diagnosis Procedure
U2148-87	CAN comm err (brake control unit)	DTC Diagnosis Procedure
U214E-87	CAN comm err (combination meter)	DTC Diagnosis Procedure
U214F-87	CAN comm err (BCM)	DTC Diagnosis Procedure
U215B-87	CAN comm err (IPDM E/R)	DTC Diagnosis Procedure

Ecm, Bcm, Ipdm E/r

List of Ecu Reference

List of ECU Reference

ECU	Reference
ECM	Values On The Diagnosis Tool
	Physical Values
	Fail-safe
	DTC Inspection Priority Chart
	DTC Index
	Test Value and Test Limit
BCM	Values on the Diagnosis Tool
	Reference Value
	Fail-safe
	DTC Inspection Priority Chart
	DTC Index
IPDM E/R	Values on the Diagnosis Tool
	Reference Value
	Fail-safe
	DTC Inspection Priority Chart
	DTC Index

 Diagnosis System (ipdm E/r)

Consult Function (ipdm E/r) CONSULT Function (IPDM E/R) IPDM E/R Refer to CONSULT Function (IPDM E/R).

 Basic Inspection

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