P0181-FUEL TEMPERATURE SENSOR PERFORMANCE
For a complete wiring diagram Refer to Section 8W
| Possible Causes |
| FUEL TEMPERATURE SENSOR - COLD |
| FUEL TEMPERATURE SENSOR - HOT |
| FUEL TEMPERATURE SENSOR CIRCUIT OPEN OR HIGH RESISTANCE |
| CONNECTOR OR TERMINAL PROBLEM |
| INTERMITTENT CONDITION |
Diagnostic Test
1. CHECKING FUEL TEMPERATURE SENSOR CONNECTORTurn the ignition off.
Disconnect the Fuel Temperature Sensor harness connector.
Inspect the connector for poor terminal contact, corrosion, damage or other problems.
Is there any evidence of connector problems?
Yes
- Repair or replace as necessary.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Go To2
2. FUEL TEMPERATURE SENSOR CIRCUITS OPEN OR HIGH RESISTANCE
Disconnect the ECM harness connectors.
Measure the resistance of both Fuel Temperature Sensor circuits between the Fuel Temperature Sensor harness connector and the ECM harness connector.
Is the resistance below 10.0 ohms for both measurements?
Yes
- Go To3
No
- Repair the Fuel Temperature Sensor circuit(s) that measured above 10.0 ohms for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
3. FUEL TEMPERATURE SENSOR - COLD
NOTE: Allow the engine to completely cool to ambient temperature.
Connect the ECM harness connector.
Connect the Fuel Temperature Sensor harness connector.
Turn the ignition on.
With the scan tool, read and note the engine coolant temperature.
With the scan tool, read the Fuel Temperature and compare it to the engine coolant temperature reading.
Are the readings within 7°C (13°F) of each other?
Yes
- Go To4
No
- Check the wiring and connectors associated with the Fuel Temperature Sensor for corrosion, damage or other problems. Repair as necessary. If no problems are found, replace the Fuel Temperature Sensor.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4. FUEL TEMPERATURE SENSOR - HOT
Start the engine and bring the engine to operating temperature (thermostat open).
Turn the engine off and wait 15 minutes to allow the engine temperature to stabilize.
With the scan tool, read and note the engine coolant temperature.
With the scan tool, read the Fuel Temperature.
Are the readings within 7°C (13°F) of each other?
Yes
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
- Check the wiring and connectors associated with the Fuel Temperature Sensor for corrosion, damage or other problems. Repair as necessary. If no problems are found, replace the Fuel Temperature Sensor.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).