DTC P0110: Intake Air Temperature Sensor Stuck Or DTC P0111: Intake Air Temperature Sensor Performance: Testing

Turn ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip counter equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION under SELF-DIAGNOSTIC SYSTEM.
Turn the ignition off. Disconnect the IAT sensor harness connector. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Ignition on, engine not running. Measure the voltage on the (K21) IAT signal circuit in the IAT sensor harness connector. Is the voltage above 5.2 volts? If yes, repair the (K21) IAT signal circuit short to battery voltage. If no, go to next step.
Turn the ignition off. Disconnect the IAT sensor harness connector. Ignition on, engine not running. With the DRBIII® scan tool, read the IAT sensor voltage. Is the voltage above 4.9 volts? If yes, go to next step. If no, go to step 7.
Turn the ignition off. Disconnect the IAT sensor harness connector. Using a jumper wire, jumper across the IAT sensor harness connector. Ignition on, engine not running. With the DRBIII® scan tool, read the IAT sensor voltage. Is the voltage below 1.0 volt? If yes, replace the IAT sensor. If no, go to next step.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.

Turn the ignition off. Disconnect the IAT sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K21) IAT signal circuit from the IAT sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (K21) IAT signal circuit.

NOTE: Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Visually inspect both the component and the PCM connectors. Look for damage, partially broken wires and backed out or corroded terminals.

Turn the ignition off. Disconnect the IAT sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K4) sensor ground circuit from the IAT sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, replace and program the PCM. See PROGRAMMING . If no, repair the open in the (K4) sensor ground circuit
Turn the ignition off. Disconnect the IAT sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K21) IAT signal circuit in the IAT sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (K21) IAT signal circuit. If no, go to next step.
Turn the ignition off. Disconnect the IAT sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between the (K4) sensor ground circuit and the (K21) IAT sensor signal circuit at the IAT sensor harness connector. Is the resistance below 5.0 ohms? If yes, repair the (K4) sensor ground circuit shorted to the (K21) IAT signal circuit. Before continuing, check the PCM harness connector terminals for corrosion, damage or terminal push out. Repair as necessary. Replace and program the PCM. See PROGRAMMING .