Instrument Cluster Test 3C - Tachometer Not Operating Properly

NOTE: Perform INSTRUMENT CLUSTER TEST 1A before proceeding with this test. For connector terminal identification and wiring diagrams, see appropriate sections in this article. Perform VERIFICATION TEST VER-1A after each repair.

CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.

Turn ignition on. Using scan tool, actuate gauges. If tachometer gradually steps up to 6000 RPM and then returns to zero, go to next step. If tachometer does not go to 6000 RPM, replace tachometer. Recalibrate gauges using scan tool.
Using scan tool, read Powertrain Control Module (PCM) status. If scan tool displays ACTIVE ON THE BUS, go to next step. If scan tool does not display ACTIVE ON THE BUS, go to appropriate SYMPTOM ID TEST 1A - IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS
NOTE: For connector terminal identification and wiring diagrams, go to appropriate section in this article. When directed to go to next step, disregard step if vehicle is not equipped with module being tested.

NOTE: Perform a visual inspection before proceeding with this test.
Connect scan tool to Data Link Connector (DLC). DLC is a 16-pin connector located on left side of steering column. Turn ignition switch to ON position. If scan tool display is not blank, go to next step. If scan tool display is blank, see appropriate VEHICLE COMMUNICATIONS article.
Start and idle engine. Using scan tool, read engine RPM. If scan tool RPM display matches tachometer RPM, tachometer is currently operating properly. If scan tool RPM display does not match tachometer RPM, replace Body Control Module (BCM) "B" connector. BCM is located with junction block. See Figure in CHIME TEST 2A.