Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- Turn the ignition switch to ON (II).
- Note the ambient temperature.
- Check the IAT SENSOR in the DATA LIST with the HDS.
- 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.
- Note the value of the FUEL TEMPERATURE SENSOR in the DATA LIST with the HDS.
- 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.
- Replace the fuel temperature sensor (see «FUEL TEMPERATURE SENSOR REPLACEMENT»(ref-379885-S01431607412010121600000) ).
- Reset the PCM with the HDS.
- Do the PCM idle learn procedure, refer to the «ECM/PCM IDLE LEARN PROCEDURE»(ref-255517-S24591238122007060300000) .
- Allow the IAT SENSOR to cool to the ambient temperature.
- 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.
- 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.
- 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»(ref-379885-S39292289912010121600000) . 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 .