DTC Troubleshooting: P1077 (106)
DTC P1077:
 IMT Valve Stuck in High 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 to 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/PCM.■
NO -
Go to Step 4 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the IMT actuator 5P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between IMT actuator 5P connector terminal No. 1 and body ground.
Is there about 5 V?
YES -
Go to Step 12 .
NO -
Go to Step 8 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector B (44P).
  1. Check for continuity between IMT actuator 5P connector terminal No. 1 and ECM/PCM connector terminal B18.
Is there continuity?
YES -
Go to Step 36 .
NO -
Repair open in the wire between the ECM/PCM (B18) and the IMT actuator, then go to Step 30 .
  1. Measure the voltage between IMT actuator 5P connector terminal No. 3 and body ground.
Is there about 5 V?
YES -
Go to Step 17 .
NO -
Go to Step 13 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector B (44P).
  1. Check for continuity between IMT actuator 5P connector terminal No. 3 and ECM/PCM connector terminal B39.
Is there continuity?
YES -
Go to Step 36 .
NO -
Repair open in the wire between the ECM/PCM (B39) and the IMT actuator, then go to Step 30 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector B (44P).
  1. Check for continuity between IMT actuator 5P connector terminal No. 2 and ECM/PCM connector terminal B33.
Is there continuity?
YES -
Go to Step 21 .
NO -
Repair open in the wire between the ECM/PCM (B33) and the IMT actuator, then go to Step 30 .
  1. Check for continuity between ECM/PCM connector terminal B37 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM/PCM (B37) and the IMT actuator, then go to Step 30 .
NO -
Go to Step 22 .
  1. Check for continuity between ECM/PCM connector terminal B38 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM/PCM (B38) and the IMT actuator, then go to Step 30 .
NO -
Go to Step 23 .
  1. Check for continuity between IMT actuator 5P connector terminal No. 4 and ECM/PCM connector terminal B37.
Is there continuity?
YES -
Go to Step 24 .
NO -
Repair open in the wire between the ECM/PCM (B37) and the IMT actuator, then go to Step 30 .
  1. Check for continuity between IMT actuator 5P connector terminal No. 5 and ECM/PCM connector terminal B38.
Is there continuity?
YES -
Go to Step 25 .
NO -
Repair open in the wire between the ECM/PCM (B38) and the IMT actuator, then go to Step 30 .
  1. Move the IMT valve by hand.
Does it move smoothly?
YES -
Go to Step 27 .
NO -
  1. Turn the ignition switch to ON (II).
  1. Do the IMT TEST in the INSPECTION MENU with the HDS.
Is the result OK?
YES -
NO -
Go to Step 36 .
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1077 indicated?
YES -
Check for poor connections or loose terminals at the IMT actuator and the ECM/PCM, then go to Step 1 .
NO -
Go to Step 35 .
  1. Monitor the OBD STATUS for DTC P1077 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 34 , 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/PCM, then go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 34 .
  1. Reconnect all connectors.
  1. Start the engine, and let it idle.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P1077 indicated?
YES -
Check for poor connections or loose terminals at the IMT actuator and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to Step 38 . If the ECM/PCM was substituted, go to Step 1 .
NO -
Go to Step 40 .
  1. Monitor the OBD STATUS for DTC P1077 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs were indicated in Step 39 , 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/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to Step 38 . If the ECM/PCM was substituted, go to Step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.