Nissan Sentra B18 (2020-2025) Service Manual: P0193 Frp Sensor

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P0193 Frp Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P0193	FUEL PRES SEN/CIRC (Fuel rail pressure sensor “A” circuit high)	Diagnosis condition	Engine running at idle
		Signal (terminal)	Fuel rail pressure sensor signal
		Threshold	Signal voltage from the fuel rail pressure sensor remains at more than 4.06 V
		Diagnosis delay time	5 seconds or more

POSSIBLE CAUSE

Harness or connectors
- 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

CHECK DTC PRIORITY

If DTC P0193 is displayed with DTC P0088 or P0090, first perform the trouble diagnosis for DTC P0088 or P0090.

Is other DTC detected?
YES >>
Perform diagnosis of applicable.
- DTC P0088: Refer to DTC Description.
- DTC P0090: Refer to DTC Description.
NO >>
GO TO 2.
PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>>
GO TO 3.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for at least 1 minute.
2. Check DTC or 1st trip DTC.
Is DTC or 1st trip DTC detected?
YES >>
Proceed 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 DTC PRIORITY

If DTC P0193 is displayed with DTC P0088 or P0090, first perform the trouble diagnosis for DTC P0088 or P0090.

Is other DTC detected?
YES >>
Perform diagnosis of applicable.
- DTC P0088: Refer to DTC Description.
- DTC P0090: Refer to DTC Description.
NO >>
GO TO 2.

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

Turn ignition switch OFF.
Disconnect FRP sensor harness 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

Is inspection result normal?

YES >>

GO TO 8.

NO >>

GO TO 3.

CHECK FRP SENSOR POWER SUPPLY-2

Check the voltage between FRP sensor harness connector and 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 6.

NO >>

GO TO 4.

CHECK FRP SENSOR POWER SUPPLY CIRCUIT

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

Is inspection result normal?

YES >>

GO TO 5.

NO >>

Repair or replace malfunctioning part.

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 >>
Replace malfunctioning part.

CHECK FRP SENSOR GROUND CIRCUIT

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 7.

NO >>

Repair or replace malfunctioning part.

CHECK ECM GROUND CIRCUIT

Check the continuity between ECM harness connector and the 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 inspection result normal?

YES >>

INSPECTION END

NO >>

Repair or replace malfunctioning part.

CHECK FRP SENSOR SIGNAL CIRCUIT

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 short to power.

Is inspection result normal?

YES >>

GO TO 9.

NO >>

Repair or replace malfunctioning part.

CHECK FRP SENSOR

Refer to Component Inspection.

Is inspection result normal?
YES >>
INSPECTION END
NO >>
Replace FRP sensor. Refer to Exploded View.

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