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Home >> Toyota >> 1997 >> Avalon XLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Tests W/Codes >> Circuit Tests >> DTC P0500: Vehicle Speed Sensor Malfunction >> Diagnosis & Repair

Diagnosis & Repair

  1. Test drive vehicle and check operation of speedometer. If speedometer is not functioning correctly, see INSTRUMENT PANELS article in the ACCESSORIES & EQUIPMENT section. If speedometer is functioning correctly, go to next step.
  2. Access ECM behind glove box. Ensure ignition is off. Disconnect ECM E5 connector. See Figure. Using ohmmeter, check continuity between ground and terminal No. 12 (Violet wire) at ECM E5 connector. If continuity exists, locate and repair short circuit. If continuity does not exist, go to next step.
  3. Turn ignition on. Using DVOM, measure voltage between ground and terminal No. 12 (Violet wire) at ECM E5 connector. If voltage is 9-14 volts, go to next step. If voltage is not 9-14 volts, check for open in Violet wire. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary.
  4. Check for open circuit in wiring harness between instrument cluster and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary. If wiring is okay, replace ECM and retest.
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