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Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sequoia, 2002 Toyota 4Runner, and 2001 Toyota Tundra. 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.
  2. Gain access to ECM. See Figure-Figure . Disconnect ECM connector that contains SP1 or SPD terminal. See Figure-Figure . Disconnect cruise control ECU (if applicable). Raise and support vehicle. Shift transmission into the Neutral position. Turn ignition on.
  3. Using DVOM, measure voltage between ground and terminal SP1 or SPD terminal on ECM connector. Rotate rear wheel. If voltage is not 4.5-5.5 volts (except Tundra) or 9-14 volts (Tundra) and generated intermittently, check and repair open circuit between combination meter and ECM. See WIRING DIAGRAMS . If voltage is as specified and generated intermittently, replace ECM and retest. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.
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