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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 125 (Engine Control System Self Diagnostics (2UZ-FE)) >> Diagnostic Tests >> DTC P0500: Vehicle Speed Sensor "A" Circuit Malfunction & P0503: Vehicle Speed Sensor "A" Circuit Intermittent/Erratic/High >> Diagnosis & Repair

Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Toyota 4Runner. 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 output signal from VSC ECU and input to combination meter may not be occurring.
  2. Remove glove box for access to ECM with electrical connectors still installed on ECM. See Figure. Raise and support vehicle with one rear wheel off the ground. Place transmission in Neutral.
  3. Disconnect ECM 32-pin connector E6 and ECM 35-pin connector E7. See Figure. Turn ignition on. Backprobing, measure voltage between ECM 32-pin connector E6 terminal No. 1 (-) and ECM 35-pin connector E7 terminal No. 17 (+) (Violet/Red wire) while rotating rear wheel. 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 or replace wire and/or connector as necessary. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article.
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