DTC Troubleshooting: P1078 (106)
DTC P1078:
 IMT Valve Stuck in Low RPM Position
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).
  1. Clear the DTC with the HDS.
  1. Do the IMT TEST in the INSPECTION MENU with the HDS.
Is the result OK?
YES -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IMT actuator and the ECM.■
NO -
Go to Step 4 .
  1. Turn the ignition switch OFF.
  1. Disconnect the IMT actuator 5P connector.
  1. Turn the ignition switch ON (II).
  1. Check the IMT VALVE SW in the DATA LIST with the HDS.
Is CLOSE indicated?
YES -
Go to Step 12 .
NO -
Go to Step 8 .
  1. Turn the ignition switch OFF.
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM connector B (44P).
  1. Check for continuity between ECM connector terminal B39 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM (B39) and the IMT actuator, then go to Step 22 .
NO -
Go to Step 29 .