44-1

VTM-4 DTC Troubleshooting: 44-1

DTC 44-1:

VTM-4 Relay

NOTE: Before you troubleshoot, review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Test-drive the vehicle, and check for DTCs with the HDS.

Is DTC 44-1 indicated?

YES -

Go to step 4.

NO -

Intermittent failure, the system is OK at this time.�

4. Measure the voltage between VTM-4 control unit connector terminal A4 and body ground, and between VTM-4 control unit connector terminal B7 and body ground respectively with the ignition switch to ON (II), and after the engine starts.










Is the voltage correct?

YES -

Go to step 17.

NO -

Go to step 5.

5. Turn the ignition switch to LOCK (0).

6. Remove the VTM-4 relay Service and Repair, and test it Power Relay Test.

Is the VTM-4 relay OK?

YES -

Go to step 7.

NO -

Replace the VTM-4 relay Service and Repair.�

7. Turn the ignition switch to ON (II) with the VTM-4 relay removed.

8. Measure the voltage between VTM-4 relay 4P connector terminals No. 1 and No. 4 to body ground respectively.





Is there battery voltage?

YES -

Go to step 9.

NO -

Check for blown No. 4 (20 A) fuse in the auxiliary under-hood fuse box or No. 18 (15 A) fuse in the under-dash fuse/relay box. If the fuses are OK, repair an open in the wire between the auxiliary under-hood fuse box or the under-dash fuse/relay box and the VTM-4 relay.�

9. Turn the ignition switch to LOCK (0).

10. Disconnect the VTM-4 control unit connector A (22P) and connector B (12P).

11. Turn the ignition switch to ON (II).

12. Measure the voltage between VTM-4 control unit connector terminals A4 and B7 to body ground respectively.





Is there battery voltage?

YES -

Repair a short to power in the wire between the VTM-4 control unit (A4 or B7) and the VTM-4 relay.�

NO -

Go to step 13.

13. Turn the ignition switch to LOCK (0).

14. Check for continuity between VTM-4 control unit connector terminals A4 and B7 to body ground respectively.





Is there continuity?

YES -

Repair a short to body ground in the wire between VTM-4 control unit (A4 or B7) and the VTM-4 relay.�

NO -

Go to step 15.

15. Check for continuity between VTM-4 control unit connector terminal A4 and the VTM-4 relay 4P connector terminal No. 3, and between VTM-4 control unit connector terminal B7 and the VTM-4 relay 4P connector terminal No. 2 respectively.





Is there continuity?

YES -

Go to step 16.

NO -

Repair an open in the wire between VTM-4 control unit connector terminals A4 or B7 and the VTM-4 relay.�

16. Reconnect all connectors.

17. Check for poor connections or loose terminals at the VTM-4 control unit and the VTM-4 relay connectors. If the connections are OK, go to step 18.

18. Test-drive the vehicle, and check for DTCs with the HDS.

Is DTC 44-1 indicated?

YES -

Substitute a known-good VTM-4 control unit Service and Repair and recheck. If the symptom/indication goes away with the known-good VTM-4 control unit, replace the original VTM-4 control unit Service and Repair.�

NO -

Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�