P0182

DTC P0182, P0183 FTT SENSOR





Component Description





The fuel tank temperature sensor (3) 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.
- Fuel level sensor unit and fuel pump (1)
- Fuel pressure regulator (2)











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

On Board Diagnosis Logic:

DTC Confirmation Procedure
1. If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
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 P0182.




Wiring Diagram




Diagnosis Procedure
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screws on the body. Refer to Power Supply and Ground Circuit.





OK or NG
OK - GO TO 2.
NG - Repair or replace ground connections.
2.CHECK DTC WITH "UNIFIED METER AND A/C AMP."
Refer to Unified Meter and A/C AMP.
OK or NG
OK - GO TO 3.
NG - Go to Fuel Level Sensor Signal Inspection.
3.CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.





2. Disconnect "fuel level sensor unit and fuel pump" harness connector (1).
- Illustration shows the view with rear seat cushion and inspection hole cover (RH) removed.
- : Vehicle front
3. Turn ignition switch ON.





4. Check voltage between "fuel level sensor unit and fuel pump" terminal 4 and ground with CONSULT-III or tester.

Voltage: Approximately 5 V

OK or NG
OK - GO TO 5.
NG - GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M66, B418
- Harness for open or short between ECM and "fuel level sensor unit and fuel pump"
Repair open circuit or short to ground or short to power in harness or connector.
5.CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect "unified meter and A/C amp." harness connector.
3. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 5 and "unified meter and
A/C amp." terminal 58. Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 7.
NG - GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M66, B418
- Harness for open or short between "fuel level sensor unit and fuel pump" and "unified meter and A/C amp."
Repair open circuit or short to ground or short to power in harness or connector.
7.CHECK FUEL TANK TEMPERATURE SENSOR
Refer to P0182.
OK or NG
OK - GO TO 8.
NG - Replace "fuel level sensor unit and fuel pump".
8.CHECK INTERMITTENT INCIDENT
Refer to Diagnosis Procedure.
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 4 and 5 by heating with hot water or heat gun as shown in the figure.









Removal and Installation

FUEL TANK TEMPERATURE SENSOR
Refer to Component.