P0113-INTAKE AIR TEMPERATURE SENSOR CIRCUIT HIGHFor a complete wiring diagram Refer to Section 8W.When Monitored:With the ignition on. Battery voltage greater than 10.4 volts.Set Condition:The Intake Air Temperature (IAT) sensor circuit voltage at the PCM goes above 4.98 volts for 2.8 seconds. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes(K21) IAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE(K21) IAT SIGNAL CIRCUIT OPEN(K900) SENSOR GROUND CIRCUIT OPENIAT SENSORPCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).Diagnostic Test1.IAT SENSOR VOLTAGE ABOVE 4.98 VOLTSIgnition on, engine not running.With a scan tool, read the Intake Air Temperature Sensor voltage.Is the voltage above 4.98 volts?YesGo To 2NoRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)2.IAT SENSORTurn the ignition off.Disconnect the Intake Air Temperature Sensor harness connector.Connect a jumper wire between the (K21) IAT Signal circuit and the (K900) Sensor ground circuit in the IAT Sensor harness connector.Ignition on, engine not running.With a scan tool, read the IAT Sensor voltage.Is the voltage below 1.0 volt with the jumper wire installed?YesReplace the IAT Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 3Remove the jumper wire before continuing.3.(K21) IAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE Disconnect the C2 PCM harness connector.Ignition on, engine not running.Measure the voltage on the (K21) IAT Signal circuit in the IAT Sensor harness connector.Is the voltage above 0 volts?YesRepair the short to battery voltage in the (K21) IAT Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 44.(K21) IAT SIGNAL CIRCUIT OPEN Turn the ignition off.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.Measure the resistance of the (K21) IAT Signal circuit from the IAT Sensor harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?YesGo To 5NoRepair the open in the (K21) IAT Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5.(K900) SENSOR GROUND CIRCUIT OPENMeasure the resistance of the (K900) Sensor ground circuit from the IAT Sensor harness connector to the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?YesGo To 6NoRepair the open in the (K900) Sensor ground circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)6.PCMBefore continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.Were there any problems found?YesRepair as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace and program the Powertrain Control Module per Service Information.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)