Diagnosis & Repair
WARNING: This page is about a different car, the 2000 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
- Access ECM behind glove box. Ensure ignition is off. Disconnect ECM harness connector E9. Check continuity between ground and terminal No. 22 (Violet/Yellow wire) at ECM harness connector E9. See Figure. If continuity exists, locate and repair short to ground. If continuity does not exist, go to next step.
- Turn ignition on. Measure voltage between ground and terminal No. 22 (Violet/Yellow wire) at ECM harness connector E12. If voltage is 9-14 volts, replace ECM. If voltage is not 9-14 volts, repair open in wiring between instrument cluster and ECM. See WIRING DIAGRAMS article.