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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Test drive vehicle and check operation of speedometer. If speedometer is not operating correctly, repair speedometer as necessary. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. If speedometer is operating correctly, go to next step.
  2. Raise and support front of vehicle. Shift transmission into Neutral. Access ECM behind glove box. Using DVOM, backprobe ECM E7 connector, terminal No. 17 (Violet/White wire). See Figure. Turn ignition on. Slowly rotate a drive wheel while observing voltage on DVOM. Voltage should fluctuate from zero volts to 4.5-5.5 volts as wheel is turned. If voltage is not as specified, locate and repair open/short circuit between terminal No. 17 (Violet/White wire) at ECM E7 harness connector and instrument cluster C7 connector, terminal No. 33 (White wire). If voltage is as specified, go to next step.
  3. Check for loose or poor connection at ECM E7 connector. Repair as necessary. If connection is okay, replace ECM and retest system.
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