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Instrument Cluster Test 3C - Tachometer Not Operating Properly

NOTE: Perform INSTUMENT CLUSTER TEST 1A  before proceeding with this test. For connector terminal identification, see CONNECTOR IDENTIFICATION  For wiring diagrams, refer to WIRING DIAGRAMS  . Perform, after each repair, TEST VER-1A - VERIFICATION PROCEDURE  .
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Using scan tool, select ENGINE, then SENSOR DISPLAYS. Select ENGINE RPM. If tachometer reading is more than 100 RPM, go to next step. If tachometer reading is 100 RPM or less, see TESTS W/CODES article in the ENGINE PERFORMANCE Section.
  2. Using scan tool, actuate instrument cluster gauges. Tachometer should move to 6000 RPM mark, then in steps should move to 3000, 1000, zero RPM marks. If tachometer functions as described, replace Body Control Module (BCM). See Figure in CHIME TEST 3A. If tachometer does not function correctly, go to next step.
  3. Remove instrument cluster and access back of gauges. Using external ohmmeter, measure resistance diagonally across tachometer terminals. If resistance is 200-220 ohms, replace instrument cluster circuit board. If resistance is not 200-220 ohms, replace tachometer gauge pack.
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