DTC Troubleshooting: P0113 (10)

DTC P0113:  IAT Sensor Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1.Turn the ignition switch ON (II).

2.Check the IAT SENSOR in the DATA LIST with the HDS.

Is about -40 °C (-40 °F) or less, or 4.90 V or higher indicated?


YES - Go to 3.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the ECM/PCM.n


3.Turn the ignition switch OFF.

4.Disconnect the MAF sensor/IAT sensor 5P connector.

5.Connect MAF sensor/IAT sensor 5P connector terminals No. 1 and No. 2 with a jumper wire.

 

6.Turn the ignition switch ON (II).

7.Check the IAT SENSOR in the DATA LIST with the HDS.

Is about -40 °C (-40 °F) or less, or 4.90 V or higher indicated?


YES - Go to 8.


NO - Go to 20.


8.Turn the ignition switch OFF.

9.Remove the jumper wire from the MAF sensor/IAT sensor 5P connector.

10.Turn the ignition switch ON (II).

11.Measure voltage between MAF sensor/IAT sensor 5P connector terminal No. 2 and body ground.

 

Is there about 5 V?


YES - Go to 12.


NO - Go to 16.

12.Turn the ignition switch OFF.

13.Jump the SCS line with the HDS.

14.Disconnect ECM/PCM connector B (44P).

15.Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 1 and ECM/PCM connector terminal B33.

 

Is there continuity?


YES - Go to 27.


NO - Repair open in the wire between the ECM/PCM (B33) and the IAT sensor, then go to 22.

16.Turn the ignition switch OFF.

17.Jump the SCS line with the HDS.

18.Disconnect ECM/PCM connector B (44P).

19.Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 2 and ECM/PCM connector terminal B31.

 

Is there continuity?


YES - Go to 27.


NO - Repair open in the wire between the ECM/PCM (B31) and the IAT sensor, then go to 22.

20.Turn the ignition switch OFF.

21.Replace the MAF sensor/IAT sensor.

22.Reconnect all connectors.

23.Turn the ignition switch ON (II).

24.Reset the ECM/PCM with the HDS.

25.Do the ECM/PCM idle learn procedure.

26.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0113 is indicated, check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Troubleshooting is complete.n


27.Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.

28.Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P0113 is indicated, check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n