P0113

P0113-INTAKE AIR TEMPERATURE SENSOR CIRCUIT HIGH






For a complete wiring diagram refer to: Electrical Diagrams

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 OPEN
- IAT SENSOR
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test
1. IAT SENSOR VOLTAGE ABOVE 4.98 VOLTS





Ignition on, engine not running.
With a scan tool, read the Intake Air Temperature Sensor voltage.

Is the voltage above 4.98 volts?
Yes >> Go To 2
No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

2. IAT SENSOR





Turn 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?
Yes >> Replace the IAT Sensor.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 3

NOTE: Remove the jumper wire before continuing.

3. (K21) IAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE





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?
Yes >> Repair the short to battery voltage in the (K21) IAT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Go To 4

4. (K21) IAT SIGNAL CIRCUIT OPEN





Turn the ignition off.
Disconnect the PCM harness connector.

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.

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?
Yes >> Go To 5
No >> Repair the open in the (K21) IAT Signal circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

5. (K900) SENSOR GROUND CIRCUIT OPEN





Measure 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?
Yes >> Go To 6
No >> Repair the open in the (K900) Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

6. PCM

NOTE: Before 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?
Yes >> Repair as necessary
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test
No >> Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test