Nissan Sentra B18 (2020-2025) Service Manual: P0183 Ftt Sensor

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P0183 Ftt Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P0183	FTT SEN/CIRCUIT (Fuel temperature sensor ″A″ circuit high)	Diagnosis condition	Ignition switch ON
		Signal (terminal)	Fuel tank temperature sensor signal
		Threshold	An excessively high voltage from the FTT sensor is sent to ECM.
		Diagnosis delay time	—

POSSIBLE CAUSE

Harness or connectors (FTT sensor circuit is open or shorted.)
Fuel temperature sensor

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

>>
GO TO 2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check 1st trip DTC.
Is 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

CHECK FUEL TANK TEMPERATURE (FTT) SENSOR POWER SUPPLY

Turn ignition switch OFF.
Disconnect fuel level sensor unit and fuel pump harness connector.
Turn ignition switch ON.

Check the voltage between fuel level sensor unit and fuel pump harness connector and ground.

+	−	Voltage (Approx.)
B48	5	Ground	5 V

−

Voltage

(Approx.)

Fuel level sensor unit and fuel pump

Connector

Terminal

B48

Ground

5 V

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

GO TO 2.

CHECK FTT SENSOR POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness connector.

Fuel level sensor unit and fuel pump		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B48	5	E16	138	Existed

Also check harness for short to ground and to power.

Is the inspection result normal?

YES >>

Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure.

NO >>

Repair or replace malfunctioning part.

CHECK FTT SENSOR GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness connector.

Fuel level sensor unit and fuel pump		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B48	6	E16	158	Existed

Also check harness for short to power.

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

Repair or replace malfunctioning part.

CHECK FTT SENSOR

Refer to DTC Description.

Is the inspection result normal?
YES >>
INSPECTION END
NO >>
Replace fuel level sensor unit, fuel filter and fuel pump assembly (with fuel tank temperature sensor). Refer to Removal and Installation.

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