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Tachometer Not Operating Properly

Possible Causes are:

Diagnose and repair any PCM or Communication DTCs before proceeding with this test. Perform the Instrument Cluster Self Test. The self test can be performed using the DRBIII(R) or manually using the following procedure: Turn ignition off. Press and hold the Trip Reset button. Turn ignition on. Observe the Tachometer during the self test. The Tachometer should position the indicator needle at the following calibration points: 0 RPM, 800 RPM, 3000 RPM (2500 RPM Diesel) and 7000 RPM (6000 RPM Diesel). Did the Tachometer position at the proper calibration points? If yes, the condition is not present at this time. Monitor DRBIII(R) parameters while wiggling the related wire harness. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness and connector terminals. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, replace the instrument cluster. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.

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