Tachometer: Testing and Inspection

1. Remove the cluster. Refer to Cluster Removal.

Cluster Wire Harness Connector:

2. Check for battery voltage at Pin J1-6 of the cluster wire harness connector.
3. With the ignition switch in the ON position, check for battery voltage at Pin J1-5 connector.
4. Check Pin J1-8 of the connector for continuity to ground.
5. Check for tachometer signal from the Powertrain Control Module by connecting an AC DIGITAL VOLTMETER to Pin J1-7 of the connector and ground. A reading of at least 1.0 volt should be present with the engine running.
a. If the voltage is NOT within specification, go to Step 6.
b. If the voltage is within specification, go to Step 7.

Powertrain Control Module Pin Location:

6. If there is less than 1.0 volt at Pin J1-7 of the connector, check for continuity between Pin J1-7 and Pin 73 of the Powertrain Control Module connector. Also, check the connector at the Powertrain Control Module for damaged pins or terminal push outs.
7. If the voltage is less than 1.0 volt at Pin J1-7 of the connector and there is continuity between Pin J1-7 and Pin 73 of the PCM connector, replace the Powertrain Control Module.
8. If all tests performed test good, replace the dial and gauge assembly.
9. If the tachometer continues to be inoperative, replace the print circuit board.