Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- Check for poor connections or loose terminals at ECT sensor 1/2 and the IAT sensor. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 15 .
- Remove the IAT sensor (see «MAP SENSOR REPLACEMENT»(ref-298125-S21402634012008091500000) ).
- Allow the IAT sensor to cool to ambient temperature.
- Note the ambient temperature.
- Connect the IAT sensor to its 2P connector, but do not install it on the intake manifold.
- Turn the ignition switch ON (II).
- Note the value of the IAT SENSOR quickly in the DATA LIST with the HDS.
- Compare the value of the IAT SENSOR and the ambient temperature. Does the value of the IAT SENSOR differ 5.4°F (3°C) or more? YES -Go to step 13 . NO -Go to step 9.
- Disconnect the IAT sensor 2P connector.
- Using a heat gun, blow hot air on the IAT sensor for a few seconds. Do not apply heat longer than a few seconds or you will damage the sensor.
- Connect the IAT sensor to its 2P connector, but do not install it on the intake manifold.
- Check the IAT SENSOR in the DATA LIST with the HDS. Does the IAT SENSOR change 45°F (25°C) or more? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the PCM. NO -Go to step 13.
- Turn the ignition switch OFF.
- Replace the I AT sensor (see «MAP SENSOR REPLACEMENT»(ref-298125-S21402634012008091500000) ).
- Turn the ignition switch ON (II).
- Reset the PCM with the HDS.
- Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(ref-243313-S13405059332006082300000) ).
- Check for Temporary DTCs or DTCs with the HDS. Is DTC P0111 indicated? YES -Check for poor connections or loose terminals at the IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.