P0183

P0182, P0183 FTT Sensor

Component Description

The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.





[Reference data]









*: This data is reference value and is measured between ECM terminal 107 (fuel tank temperature sensor) and ground.

CAUTION:

Never use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

On Board Diagnosis Logic






DTC Confirmation Procedure

1) If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next step.
a) Turn ignition switch OFF and wait at least 10 seconds.
b) Turn ignition switch ON.
c) Turn ignition switch OFF and wait at least 10 seconds.
2) Turn ignition switch ON and wait at least 5 seconds.
3) Check 1st trip DTC.
4) If 1st trip DTC is detected, go to "Diagnosis Procedure".

Diagnosis Procedure

1. CHECK COMBINATION METER FUNCTION

Refer to [Diagnosis and Repair Workflow: Meter, Warning Lamp and Indicator] Diagnosis and Repair Workflow Meter, Warning Lamp and Indicator.

OK or NG
OK
GO TO 2.
NG
Go to [Fuel Level Sensor Signal Circuit Check] Testing and Inspection.

2. CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

1 Turn ignition switch OFF.
2 Disconnect "fuel level sensor unit and fuel pump" harness connector.





3 Turn ignition switch ON.
4 Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with SDT or tester.











OK or NG
OK
GO TO 4.
NG
GO TO 3.

3. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors E41, C1
- Harness for open or short between ECM and "fuel level sensor unit and fuel pump"


Repair harness or connector.

4. CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1 Turn ignition switch OFF.
2 Disconnect combination meter harness connector.
3 Check harness continuity between "fuel level sensor unit and fuel pump" terminal 2 and combination meter terminal 9. Refer to Wiring Diagram.






4 Also check harness for short to ground and short to power.

OK or NG
OK
GO TO 6.
NG
GO TO 5.

5. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors E41, C1
- Harness connectors E152, M31
- Harness for open or short between "fuel level sensor unit and fuel pump" and combination meter


Repair open circuit or short to ground or short to power in harness or connector.

6. CHECK FUEL TANK TEMPERATURE SENSOR

Refer to "Component Inspection".

OK or NG
OK
GO TO 7.
NG
Replace fuel level sensor unit. Refer to [Fuel Level Sensor Unit, Fuel Filter and Fuel Pump Assembly: Removal and Installation] Removal and Replacement.

7. CHECK INTERMITTENT INCIDENT

Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.


INSPECTION END

Component Inspection

Fuel Tank Temperature Sensor

1) Remove fuel level sensor unit.
2) Check resistance between "fuel level sensor unit and fuel pump" terminals 2 and 4 by heating with hot water or heat gun as shown in the figure.