Nissan Sentra B18 (2020-2025) Service Manual: P119a Fuel Rail Pressure Sensor

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P119a Fuel Rail Pressure Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P119A	FUEL PRESSURE SENSOR (Fuel pressure sensor)	Diagnosis condition	Battery voltage: 8 V or more Under engine start condition Engine coolant temperature at previous ignition switch OFF: 65°C (149°F) or more Engine coolant temperature: 35°C (65°F) or less Temperature difference between engine coolant and intake air: Less than 6°C (42°F) Fuel system monitor: Excessively RICH
		Signal (terminal)	Fuel rail pressure sensor signal
		Threshold	Fuel rail pressure is less than 1.0 MPa (10.2 kg/cm², 145 psi) (calculated by ECM)
		Diagnosis delay time	—

POSSIBLE CAUSE

Harness or connectors
- The fuel rail pressure sensor circuit is open or shorted.
- Sensor power supply 2 is shorted.
Fuel rail pressure sensor
Each sensor, connected with sensor power supply 2 circuit

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

PRECONDITIONING-1

If DTC Confirmation Procedure is previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:

Before performing the following procedure, check that battery voltage is 9 V or more with ignition switch ON.

>>
GO TO 2.
PRECONDITIONING-2
Note:
- When it is certain that the previous driving is performed with the engine warmed up, the next steps can be performed.
- When it is difficult to satisfy the conditions, performing Component Function Check can identify the presence or absence of malfunction in the part/system that may result in a possible cause of this DTC. (Perform DTC Confirmation Procedure as much as possible.)
1. Start the engine and warm it up until engine coolant temperature reaches 70°C (158°F) or more.
2. Stop the engine and leave the Nissan Sentra vehicle in a cool place (soak the engine) until the engine coolant temperature reaches 35°C (95°F) or less.
CAUTION:
Are the conditions satisfied?
YES >>
GO TO 4.
NO >>
GO TO 3.

COMPONENT FUNCTION CHECK

With CONSULT

Turn ignition switch OFF.
Start the engine and warm it up to normal operating temperature.

Select “FUEL PRES SEN V” in “DATA MONITOR” mode of “ENGINE” using CONSULT and check the indication under the following condition.

Monitor item	Condition		Indication
FUEL PRES SEN V	Engine: After warming up Selector lever: P or N position (CVT models), Neutral position (M/T models) A/C switch: OFF No load	Engine speed: Idle	0.85 V
FUEL PRES SEN V		Revving engine from idle to 4,000 rpm quickly	0.97 V

Without CONSULT

Turn ignition switch OFF.
Start the engine and warm it up to normal operating temperature.

Check FRP sensor signal voltage.

ECM			Condition	Voltage
Connector	+	−
Connector	Terminal
F24	44	45	[Engine is running] Engine warm-up condition Engine speed: Idle	0.85 V
F24	44	45	[Engine is running] Engine warm-up condition Revving engine from idle to 4,000 rpm quickly	0.97 V

Is the inspection result normal?

YES >>

INSPECTION END.

NO >>

Proceed to DTC Diagnosis Procedure.

PERFORM DTC CONFIRMATION PROCEDURE-1

With CONSULT
1. Turn ignition switch ON (engine stopped).
2. Select “COOLANT TEMP/S” and “INT/A TEMP SE” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
3. Check that the indicated value of “COOLANT TEMP/S” is less than 35°C (95°F).
4. Check that the difference between “INT/A TEMP SE” and “COOLANT TEMP/S” is 5°C (41°F) or less.
5. Check “Self-diagnostic result” of “ENGINE”.
Is the DTC detected?
YES >>
Refer to DTC Diagnosis Procedure.
NO-1 (Conditions satisfied) >>
GO TO 5.
NO-2 (Conditions not satisfied) >>
GO TO 2.
PERFORM DTC CONFIRMATION PROCEDURE-2
1. Start the engine (or cranking) at least 1 second.
2. Check “Self-diagnostic result” of “ENGINE”.
Is the DTC detected?
YES >>
Refer to DTC Diagnosis Procedure.
NO-1 >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO-2 >>
Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure Note:

Turning the ignition switch ON with FRP sensor harness connector disconnected causes ECM to detect DTC P0190. Be sure to erase the DTC when the diagnosis procedure.

CHECK FUEL RAIL PRESSURE (FRP) SENSOR POWER SUPPLY-1

Turn ignition switch OFF.
Disconnect FRP sensor connector.
Turn ignition switch ON.

Check the voltage between FRP sensor harness connector terminals.

FRP sensor	Voltage (Approx.)
F101	1	3	5 V

FRP sensor

Voltage

(Approx.)

Connector

−

terminal

F101

5 V

Inspection result normal?

YES >>

GO TO 7.

NO >>

GO TO 2.

CHECK FRP SENSOR POWER SUPPLY-2

Check the voltage between FRP sensor harness connector and the ground.

+	−	Voltage (Approx.)
F101	1	Ground	5 V

−

Voltage

(Approx.)

FRP sensor

Connector

Terminal

F101

Ground

5 V

Is inspection result normal?

YES >>

GO TO 5.

NO >>

GO TO 3.

CHECK FRP SENSOR POWER SUPPLY CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between FRP sensor harness connector and ECM harness connector.

FRP sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F101	1	F24	43	Existed

Also check harness for short to power.

Is inspection result normal?

YES >>

GO TO 4.

NO >>

Repair or replace error-detected parts.

CHECK SENSOR POWER SUPPLY 2 CIRCUIT

Refer to Diagnosis Procedure.

Is inspection result normal?
YES >>
Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure.
NO >>
Repair or replace error-detected parts.

CHECK FRP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between FRP sensor harness connector and ECM harness connector.

FRP sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F101	3	F24	45	Existed

Also check harness for short to power.

Is inspection result normal?

YES >>

GO TO 6.

NO >>

Repair or replace error-detected parts.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT

Check the continuity between ECM harness connector and ground.

ECM		—	Continuity
Connector	Terminal	—	Continuity
F24	5	Ground	Existed
F24	65
F25	69
E16	157
	159
	162

Also check harness for short to power.

Is the inspection result normal?

YES >>

INSPECTION END

NO >>

Repair or replace error-detected parts.

CHECK FRP SENSOR SIGNAL CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between FRP sensor harness connector and ECM harness connector.

FRP sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F101	2	F24	44	Existed

Also check harness for short to ground and to power.

Is inspection result normal?

YES >>

GO TO 8.

NO >>

Repair or replace error-detected parts.

CHECK FRP SENSOR

Check the FRP sensor. Refer to Component Inspection.

Is inspection result normal?
YES >>
INSPECTION END
NO >>
Repair or replace error-detected parts.

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