Diagnostic Aids

Be sure to inspect the ECM and the engine grounds for being secure and clean.

A short to voltage in one of the sensor circuits can cause DTCs P0108, P0113, P0118, P0123, P0132, P0463, P0533, P1106, P1111, P1115, or P1121 to be set.

If a sensor input circuit has been shorted to voltage, ensure that the sensor is not damaged. A damaged sensor will continue to indicate a high or low voltage after the affected circuit has been repaired. If the sensor has been damaged, replace it.

An open in the sensor ground circuit between the ECM and the splice will cause 1 or more of the following DTCs to be set: DTCs P0107, P0108, P0113, P0118, P0122, P0123, P0131, P0137, P0462, P0532, P1106, P1111, P1115, or P1121.

A short to ground in the 5-volt reference circuit or an open in the 5-volt reference circuit between the ECM and the splice will cause 1 or more of the following DTCs to be set: P0107, P0112, P0117, P0122, P0131, P0137, P0462, P0532, P1107, P1112, P1114, or P1122.

Inspect for the following conditions:

• Inspect for a poor connection at the ECM. Inspect the harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, and a poor terminal-to-wire connection.
• Inspect the wiring harness for damage. If the harness appears to be OK, observe an affected sensor's displayed value on the scan tool with the ignition ON and the engine OFF while moving the connectors and wiring harnesses related to the affected sensors. A change in the affected sensor's displayed value will indicate the location of the fault.

If a sensor input circuit has been shorted to voltage, ensure that the sensor has not been damaged. A damaged IAT or ECT sensor will continue to indicate a high voltage or low temperature after the affected circuit has been required. A damaged ECT, TP, MAP, or EGR pintle position sensor will indicate a high or low voltage or may be stuck at a fixed value after the affected circuit has been repaired. If the sensor has been damaged, replace it.