Tachometer: Testing and Inspection

1. Remove cluster.
2. With the ignition switch ON, check for battery voltage at cavity K of the instrument cluster grey connector.
3. Check cavity F of the red connector for continuity to ground.
4. Check for tachometer signal from the engine controller by connecting an AC digital voltmeter between cavity H of the instrument cluster grey connector and ground. A reading of at least 1.0 volts should be present while the engine is running.
^ If voltage is within specifications, go to step 6.
5. If there is less than 1.0 volts at cavity H, check for continuity between cavity H of the instrument cluster and pin 43 of the engine controller connector.
^ If continuity is good and no pins or terminals are damaged, replace the engine controller.

Tachometer Drive Module:

6. If all tests performed good, replace the tachometer drive module.
7. If the tachometer continues to be inoperative, replace the tachometer assembly.

Multiple Gauge Malfunction

If the Voltmeter, Speedometer, Tachometer, and other gauges appear to be malfunctioning, proceed as follows:
1. Remove the cluster.
2. Check for ignition voltage at pin E of the red cluster connector.
^ If voltage is not present, repair open circuit.
3. Check for ground continuity between pin C of the red cluster connector.
^ If a good ground is not present, repair open circuit.
4. If circuits are OK and pins or connectors are not distorted, replace the printed circuit board.