The VTM-4 Indicator Does Not Come On

Symptom Troubleshooting: The VTM-4 indicator does not come on

The VTM-4 indicator does not come on

1. Do the gauge control module self-diagnosis function. Initial Inspection and Diagnostic Overview

Is the gauge control module OK?
YES - Go to step 2.

NO - Go to the gauge control module input test Initial Inspection and Diagnostic Overview and check for an open or short in the power and ground.


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

3. Connect VTM-4 control unit connector terminal A14 and VTM-4 control unit connector terminal B11 to body ground with jumper wires.

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

5. Watch the VTM-4 indicator.

Does the VTM-4 indicator come on?
YES - Check for poor connections or loose terminals at the VTM-4 control unit 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

NO - Go to step 6.






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

7. Disconnect gauge control module connector A (30P).

8. Connect gauge control module connector terminal C3 to body ground with a jumper wire.






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

Is there continuity?
YES - Substitute a known-good gauge control module and recheck. If the symptom/indication goes away with the known-good gauge control module, replace the original gauge control module. Service and Repair

NO - Repair open in the wire between gauge control module (C3) and the VTM-4 control unit (A14 or B11).