Vtm-4 Indicator Comes on, But No DTC Is Stored

The VTM-4 indicator comes on, but no DTC is stored
1. Check the No. 6 (15A) fuse in the driver's underdash fuse/relay box.
Is the fuse OK?
YES- Go to step 2.
NO- Replace the fuse and recheck.
2. Reinitialize the VTM-4 control unit, and watch the VTM-4 indicator.
Does the VTM-4 indicator come on and stay on?
YES- Go to step 3.
NO-The system is OK at this time.
3. Turn the ignition switch OFF.





4. Measure the voltage between the A12 and A10 terminals of the VTM-4 control unit, and between the B26 and B12 terminal of the VTM-4 control unit.
Is there battery voltage?
YES-Go to step 5.
NO-Repair open in the wire between A12 or B26 terminals of the VTM-4 control unit and the driver's under-dash fuse/relay box, or repair open in the wire between A10 or B12 terminals of the VTM-4 control unit and body ground.
5. Turn the ignition switch OFF.
6. Disconnect the VTM-4 control unit and the gauge assembly connectors.





7. Check for continuity between the A14 and B20 terminals of the VTM-4 control unit and body ground.
Is there continuity?
YES-Repair short to ground in the wire between the A14 or B20 terminals of the VTM-4 control unit and the gauge assembly.
NO-Go to step 8.
8. Reconnect the gauge assembly connectors only, then turn the ignition switch ON (II).
Does the VTM-4 indicator come on?
YES-Replace the gauge assembly.
NO-Check for loose terminal fit in VTM-4 connectors. If it is normal, replace the VTM-4 control unit,