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Diagnosis & Repair

  1. Test drive vehicle and check operation of speedometer. If speedometer is not functioning correctly, see INSTRUMENT PANELS article in the ACCESSORIES & EQUIPMENT section. If speedometer is functioning correctly, go to next step.
  2. Access ECM under driver's seat. Ensure ignition is off. Shift gear selector to Neutral. Lift and support rear of vehicle. Turn ignition on. Using DVOM, measure voltage between ground and terminal No. 8 (Violet/White wire) at ECM E9 connector, while rotating rear wheels. See Figure.
  3. As rear wheels are rotated, voltage should pulse between zero and 9-14 volts. If voltage is as specified, replace ECM and retest. If voltage is not as specified, check Violet/White wire between instrument cluster and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary.
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