P0461

Component Description
The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the ECM.

It consists of two parts, one is mechanical float and the other side is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

On Board Diagnostic Logic
Driving long distances affects fuel gauge level.

This diagnosis detects the fuel gauge malfunction of the gauge not moving even after a long distance has been driven. Malfunction is detected when the output signal of the fuel level sensor does not change within the specified range even though the vehicle has been driven a long distance.

Possible Cause
- Harness or connectors
(The level sensor circuit is open or shorted.)
- Fuel level sensor

Overall Function Check
Use this procedure to check the overall function of the fuel level sensor function. During this check, a 1st trip DTC might not be confirmed.

WARNING: When performing following procedure, be sure to observe the handling of the fuel. Refer to "FUEL SYSTEM".

TESTING CONDITION:
Before starting overall function check, preparation of draining fuel and refilling fuel is required.




WITH CONSULT-II

NOTE: Start from step 11, if it is possible to confirm that the fuel cannot be drained by 30 l (7 - 7/8 US gal, 6 - 5/8 Imp gal) in advance.

1. Prepare a fuel container and a spare hose.
2. Release fuel pressure from fuel line, refer to "Fuel Pressure Release".
3. Remove the fuel feed hose on the fuel level sensor unit.
4. Connect a spare fuel hose where the fuel feed hose was removed.
5. turn ignition switch "OFF" and wait at least 10 seconds then turn "ON".
6. Select "FUEL LEVEL SE" in "DATA MONITOR" mode with CONSULT-II.
7. Check "FUEL LEVEL SE" output voltage and note it.
8. Select "FUEL PUMP" in "ACTIVE TEST" mode with CONSULT-II.
9. Touch "ON" and drain fuel approximately 30 l (7 - 7/8 US gal, 6 - 5/8 Imp gal) and stop it.
10. Fill fuel into the fuel tank for 30 l (7 - 7/8 US gal, 6 - 5/8 Imp gal).
11. Check "FUEL LEVEL SE" output voltage and note it.
12. Check "FUEL LEVEL SE" output voltage and confirm whether the voltage changes more than 0.03 V during step 7 to 11. If NG, check the fuel level sensor, refer to "FUEL LEVEL SENSOR UNIT CHECK".




WITH GST

NOTE: Start from step 11, if it is possible to confirm that the fuel cannot be drained by 30 l (7 - 7/8 US gal, 6 - 5/8 Imp gal) in advance.

1. Prepare a fuel container and a spare hose.
2. Release fuel pressure from fuel line, refer to "Fuel Pressure Release".
3. Remove the fuel feed hose on the fuel level sensor unit.
4. Connect a spare fuel hose where the fuel feed hose was removed.
5. Turn ignition switch "OFF".
6. Set voltmeters probe between ECM terminal 83 (fuel level sensor signal) and ground.
7. Turn ignition switch "ON".
8. Check voltage between ECM terminal 83 and ground and note it.
9. Drain fuel by 30 l (7 - 7/8 US gal, 6 - 5/8 Imp gal) from the fuel tank using proper equipment.
10. Fill fuel into the fuel tank for 30 l (7 - 7/8 US gal, 6 - 5/8 Imp gal).
11. Confirm that the voltage between ECM terminal 83 and ground changes more than 0.03 V during step 8 - 10.
If NG, check component of fuel level sensor, refer to "FUEL LEVEL SENSOR UNIT CHECK".