The VTM-4 Indicator Comes On, But No DTCs Are Stored In Any System: VTM-4, VSA, Or PCM

Rear Differential Symptom Troubleshooting - The VTM-4 indicator comes on, but no DTCs are stored in any system: VTM-4, VSA, or PCM

The VTM-4 indicator comes on, but no DTCs are stored in any system: VTM-4, VSA, or PCM

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

1. Check the No. 21 (7.5 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 2.

NO -

Replace the fuse, and recheck.�

2. Do the VTM-4 control unit Initialization.

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

4. Check the VTM-4 indicator.

Does the VTM-4 indicator come on and stay on?

YES -

Go to step 5.

NO -

The system is OK at this time.�

5. Measure the voltage between VTM-4 control unit connector terminals A1 and A10, and between VTM-4 control unit connector terminals A1 and B12 respectively.





Is there battery voltage?

YES -

Go to step 6.

NO -

Repair an open in the wire between VTM-4 control unit (A1) and the under-dash fuse/relay box, or repair an open in the wire between VTM-4 control unit (A10 or B12) and body ground, or check the poor ground (G501).�

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

7. Disconnect VTM-4 control unit A (22P), B (12P), and gauge control module connector C (20P).

8. Check for continuity between the VTM-4 control unit connector terminal A14, and VTM-4 control unit connector terminal B11 to body ground respectively.





Is there continuity?

YES -

Repair a short to body ground in the wire between VTM-4 control unit (A14 or B11) and the gauge control module.�

NO -

Go to step 9.

9. Reconnect the gauge control module connectors.

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

11. Check the VTM-4 indicator.

Does the VTM-4 indicator come on?

YES -

Replace the gauge control module Service and Repair.�

NO -

Check for poor connections or loose terminals at the VTM-4 connectors. If the connections are OK, 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.�