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Tachometer Circuit Test

  1. Turn ignition on. Using a DVOM, measure voltage between ground and terminal No. 15 of instrument cluster connector No. 1. See Figure . If battery voltage is present, go to step 3). If battery volta ge is not present, go to next step.
  2. Check for faulty fuse No. 7 (10-amp), located in passenger compartment fuse block. Also, check wiring harness between fuse and instrument cluster for an open or short. See WIRING DIAGRAMS  . Repair as necessary.
  3. Turn ignition off. Using a DVOM, check for continuity between ground and terminal No. 35 of instrument cluster connector No. 3. See Figure . If continuity is present, go to next step. If continuity is not present, repair Black wire for an open or poor connection.
  4. Start engine. Using a DVOM, measure voltage between terminals No. 32 and 35 of instrument cluster connector No. 3 with engine at idle and at 2000 RPM. See Figure . Voltage should increase as engine RPM increases, and decrease as engine RPM decreases. If operation is as specified, replace tachometer. If operation is not as specified, check White wire for an open or short between ECM and instrument cluster. Repair as necessary.
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