DTC P0113: INTAKE AIR TEMPERATURE SENSOR VOLTAGE TOO HIGH

Monitor & Set Conditions

Intake Air Temperature (IAT) sensor voltage is monitored when the ignition is on and battery voltage is greater than 10.4 volts. DTC may be stored when IAT sensor voltage at ECM is greater than 4.97 volts for greater than 2 seconds.

Possible Causes

• Intermittent Wiring Problem
• IAT Signal Circuit Shorted To Voltage
• IAT Sensor Signal Circuit Open
• Sensor Ground Circuit Open
• IAT Sensor
• ECM

Testing

1. Turn ignition on with engine off. Using DRBIII(R) scan tool, read IAT sensor voltage. If IAT sensor voltage is greater than 4.5 volts, go to next step. If IAT sensor voltage is 4.5 volts or less, go to step 6.

2. Turn ignition off. Disconnect IAT sensor harness connector. IAT sensor is located on driver's side rear corner of the cylinder head. Turn ignition on with engine off. Using scan tool, read IAT sensor voltage. If IAT sensor voltage is 6 volts or less, go to next step. If IAT sensor voltage is greater than 6 volts, repair IAT sensor signal circuit for a short to voltage.

3. Turn ignition off. Connect a fused jumper wire between IAT sensor harness connector terminals. Turn ignition on with engine off. Turn ignition on with engine off. Using scan tool, read IAT sensor voltage. If IAT sensor voltage is one volt or greater, go to next step. If IAT sensor voltage is less than one volt, replace IAT sensor. See appropriate REMOVAL, OVERHAUL & INSTALLATION article.

4. Turn ignition off. Disconnect ECM harness connector. ECM is located on driver's side of the engine, just in front of fuel transfer pump and contains a 50-pin connector. Ensure IAT sensor harness connector is still disconnected. Using DVOM, measure the resistance of Black/Red wire between terminal "B" on IAT sensor connector and terminal No. 7 on ECM connector. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or greater, repair open in Black/Red wire between IAT sensor and ECM.

5. Using DVOM, measure resistance between ground and IAT sensor harness connector terminal "A" (Black/Light Blue wire). If resistance is less than 10 ohms, replace and program the ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. If resistance is 10 ohms or greater, repair open in IAT sensor ground circuit.

6. The conditions that set the DTC are not present at this time. With ignition on engine off, monitor DRBIII (R) scan tool parameters related to the DTC while wiggling wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII(R) Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. 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. Was any of the above conditions present? If yes, repair as necessary. If no, the test is complete.