DTC Troubleshooting

DTC Troubleshooting: P0181

DTC P0181:

Fuel Temperature Sensor Circuit Range/Performance Problem

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Turn the ignition switch to ON (II).

2. Note the ambient temperature.

3. Check the IAT SENSOR in the DATA LIST with the HDS.

4. Compare the value of the IAT SENSOR to the ambient temperature.

Is the value of the IAT SENSOR and the ambient temperature the same?

YES -

Go to step 5.

NO -

Allow the IAT SENSOR to cool to the ambient temperature, then go to step 5.

5. Note the value of the FUEL TEMPERATURE SENSOR in the DATA LIST with the HDS.

6. Compare the value of the IAT SENSOR to the FUEL TEMPERATURE SENSOR.

Does the value of the FUEL TEMPERATURE SENSOR differ 45 °F (25 °C) or more from the IAT SENSOR?

YES -

Go to step 7.

NO -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the fuel temperature sensor and the PCM.�

7. Replace the fuel temperature sensor Service and Repair.

8. Reset the PCM with the HDS.

9. Do the PCM idle learn procedure ECM/PCM Idle Learn Procedure.

10. Allow the IAT SENSOR to cool to the ambient temperature.

11. Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

12. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0181 indicated?

YES -

Check for poor connections or loose terminals at the fuel temperature sensor and the PCM, then go to step 1.

NO -

Go to step 13.

13. Monitor the OBD STATUS for DTC P0181 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES -

Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 12, go to the indicated DTC's troubleshooting.�

NO -

If the screen indicates FAILED, check for poor connections or loose terminals at the fuel temperature sensor and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 10.