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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Toyota Prius. 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 operates properly, go to next step. If speedometer does not operate properly, repair speedometer as necessary. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Speedometer may not operate, as input signal from brake ECU may not be input to instrument cluster or defective brake ECU.
  2. Remove glove box for access to ECM with electrical connectors still installed on ECM. See Figure. Turn ignition on. Using voltmeter, check voltage between body ground and terminal No. 5 (Violet/White wire) at ECM electrical connector E10 while slowly driving vehicle. See Figure. This is the SPD terminal on ECM. Voltage should pulse between zero volts and 4.5-5.5 volts. If voltage is within specification, replace ECM. If voltage is not within specification, repair open or short in Violet/White wire and electrical connectors between ECM and instrument cluster. See WIRING DIAGRAMS article.
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