P0460-FUEL LEVEL SENSOR CIRCUIT SIGNAL VOLTAGE TOO HIGH
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on.
- Set Condition:
The Fuel Level Sensor signal voltage is above 4.51 volts for 1.0 seconds.
| Possible Causes |
| INTERMITTENT CONDITION |
| (K304) FUEL LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| (K304) FUEL LEVEL SENSOR SIGNAL CIRCUIT OPEN |
| (K300) FUEL LEVEL SENSOR GROUND CIRCUIT OPEN |
| FUEL PUMP MODULE |
| BODY CONTROL MODULE |
Diagnostic Test
1. CHECK FOR ACTIVE DTCNOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Turn the ignition off, wait 10 seconds, then turn the ignition on.
With the scan tool, read ECM DTCs.
Did this DTC set again?
Yes
- Go To 2
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2. (K304) FUEL LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the BCM harness connectors.
Disconnect the Fuel Pump Module harness connector.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage on the (K304) Fuel Level Sensor Signal circuit.
Is the voltage below 0.5 volt?
Yes
- Go To 3
No
- Repair the (K304) Fuel Level Sensor Signal circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
3. (K304) FUEL LEVEL SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off.
Remove jumper wire and install ASD relay.
Measure the resistance of the (K304) Fuel Level Sensor Signal circuit from the Fuel Pump Module harness connector to the BCM harness connector.
Is the resistance below 10.0 ohms?
Yes
- Go To 4
No
- Repair the (K304) Fuel Level Sensor Signal circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4. FUEL LEVEL SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the (K300) Fuel Level Sensor Ground circuit from the Fuel Pump Module harness connector to the BCM harness connector.
Is the resistance below 10.0 ohms?
Yes
- Go To 5
No
- Repair the (K300) Fuel Level Sensor Ground circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
5. FUEL LEVEL SENSOR
Connect the BCM harness connectors.
Turn the ignition on.
With the scan tool, read and record the Fuel Level Sensor voltage.
NOTE: The Fuel Level Sensor voltage should be 5.0 ± 0.3 volts with the sensor harness connector disconnected.
Connect a jumper wire across the Fuel Level Sensor Signal circuit and Sensor Ground circuit at the Fuel Pump Module harness connector.
With the scan tool, read the Fuel Level Sensor voltage.
NOTE: The Fuel Level Sensor voltage should be less then 1.0 volt with the jumper wire connected.
Are the voltage readings the expected voltages?
Yes
- Replace the Fuel Pump Module in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Replace and program the Body Control Module in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).