DTC Troubleshooting: P0113 (125)
DTC P0113:
 IAT Sensor 1 Circuit High Voltage
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Check IAT SENSOR 1 in the DATA LIST with the HDS.
Is about 4.90 V or higher indicated?
YES -
Go to Step 3 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the ECM.■
  1. Check for Temporary DTCs or DTCs with the HDS.
Are DTC P0103 and P0113 indicated at same time?
YES -
Go to Step 4 .
NO -
Go to Step 14 .
  1. Turn the ignition switch OFF.
  1. Disconnect the MAF sensor/IAT sensor 1 5P connector.
  1. Connect MAF sensor/IAT sensor 1 5P connector terminals No. 1 and No. 4 with a jumper wire.
  1. Turn the ignition switch ON (II).
  1. Check IAT SENSOR 1 in the DATA LIST with the HDS.
Is about 4.90 V or higher indicated?
YES -
Go to Step 9 .
NO -
Go to Step 24 .
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Remove the jumper wire from the MAF sensor/IAT sensor 1 5P connector.
  1. Disconnect ECM connector No. 1 (96P).
  1. Connect MAF sensor/IAT sensor 1 5P connector terminal No. 4 to body ground with a jumper wire.
  1. Check for continuity between ECM connector No. 1 terminal No. 69 and body ground.
Is there continuity?
YES -
Go to Step 30 .
NO -
Repair open in the wire between the MAF sensor/IAT sensor 1 and ECM connector No. 1 terminal No. 69, then go to Step 26 .
  1. Turn the ignition switch OFF.
  1. Disconnect the MAF sensor/IAT sensor 1 5P connector.
  1. Connect MAF sensor/IAT sensor 1 5P connector terminals No. 1 and No. 4 with a jumper wire.
  1. Turn the ignition switch ON (II).
  1. Check IAT SENSOR 1 in the DATA LIST with the HDS.
Is about 4.90 V or higher indicated?
YES -
Go to Step 19 .
NO -
Go to Step 24 .
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Remove the jumper wire from the MAF sensor/IAT sensor 1 5P connector.
  1. Disconnect ECM connector No. 1 (96P).
  1. Connect MAF sensor/IAT sensor 1 5P connector terminal No. 1 to body ground with a jumper wire.
  1. Check for continuity between ECM connector No. 1 terminal No. 88 and body ground.
Is there continuity?
YES -
Go to Step 30 .
NO -
Repair open in the wire between the MAF sensor/IAT sensor 1 and ECM connector No. 1 terminal No. 88, then go to Step 26 .
  1. Turn the ignition switch OFF.
  1. Reconnect all connectors.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0113 indicated?
YES -
Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the ECM, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■
  1. Reconnect all connectors.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0113 indicated?
YES -
Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the ECM. If the ECM was updated, substitute a known-good ECM, then recheck. If the ECM was substituted, go to Step 1 .
NO -
If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■