Instrument Cluster Test 5A - Tachometer Not Operating Properly

NOTE: Perform INSTRUMENT CLUSTER TEST 1A before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagrams, refer to WIRING DIAGRAMS . Refer to INSTRUMENT PANEL article. After each repair, perform TEST VER-1A .

CAUTION: Always turn ignition switch to OFF position prior to disconnecting any module connector. Ensure all connectors are clean and tight.

Using scan tool, select MIC CLUSTER. Actuate tachometer. If tachometer moves to it's calibration points, replace Powertrain Control Module (PCM). PCM is located in engine compartment, next to power distribution center. See GAUGE CALIBRATION POINTS table under INSTRUMENT CLUSTER TEST 2A. If tachometer does not move to it's calibration points, go to next step.
Remove instrument cluster. Loosen screws holding tachometer to circuit board. Ensure screws do not touch circuit board. Using an ohmmeter, measure resistance across fuel gauge coils No. 1 and 2. See Figure in INSTRUMENT CLUSTER TEST 4A. If resistance across each coil is about 280 ohms, replace circuit board. If resistance across each coil is not about 280 ohms, replace tachometer.