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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Toyota Land Cruiser, 2002 Lexus LX 470, 2001 Toyota Land Cruiser, and 2001 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. Test drive vehicle and determine if speedometer is functioning properly. If speedometer is okay, go to next step. If speedometer is not functioning, go to NO. 1 VEHICLE SPEED SENSOR  under COMPONENT TESTS. If the speed sensor tests okay, see appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
  2. Access ECM by removing glove compartment. Disconnect rear differential lock control ECU connector (10-pin), located below ECM. Disconnect center ECU connector (22-pin), located behind center console.
  3. Place transmission into the Neutral position. Jack up one rear wheel. Turn the ignition to the ON position. Using DVOM, backprobe appropriate ECM connector. Measure voltage between ECM terminal SPD and ground while rotating rear wheel. See WIRING DIAGRAMS . If voltage is not 9-14 volts and generated intermittently, check and repair open circuit between combination meter and ECM. If voltage is 9-14 volts and generated intermittently, replace ECM and retest. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.
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