DTC Troubleshooting: P1078 (106)
  1. Check for continuity between IMT actuator 5P connector terminal No. 5 and ECM connector terminal B38.
Is there continuity?
YES -
Go to Step 16 .
NO -
Repair open in the wire between the ECM (B38) and the IMT actuator, then go to Step 22 .
  1. Remove the IMT actuator.
  1. Move the IMT valve by hand.
Does it move smoothly?
YES -
Go to Step 18 .
NO -
Replace the IMT valve, then go to Step 22 .
  1. Substitute a known-good IMT actuator.
  1. Reconnect all connectors and the battery.
  1. Turn the ignition switch ON (II).
  1. Do the IMT TEST in the INSPECTION MENU with the HDS.
Is the result OK?
YES -
Replace the original IMT actuator, then go to Step 22 .
NO -
Go to Step 30 .
  1. Reconnect all connectors and the battery.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM with the HDS.
  1. Do the ECM idle learn procedure.
  1. Do the IMT TEST in the INSPECTION MENU with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1078 indicated?
YES -
Check for poor connections or loose terminals at the IMT actuator and the ECM, then go to Step 1 .
NO -
Go to Step 28 .
  1. Monitor the OBD STATUS for DTC P1078 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in Step 27 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the IMT actuator and the ECM, then go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 26 .
  1. Reconnect all connectors.
  1. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
  1. Do the IMT TEST in the INSPECTION MENU with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1078 indicated?
YES -
Check for poor connections or loose terminals at the IMT actuator and the ECM. If the ECM was updated, substitute a known-good ECM, then go to Step 31 . If the ECM was substituted, go to Step 1 .
NO -
Go to Step 33 .
  1. Monitor the OBD STATUS for DTC P1078 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs were indicated in Step 32 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the IMT actuator and the ECM. If the ECM was updated, substitute a known-good ECM, then go to Step 31 . If the ECM was substituted, go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 31 .