Circuit Description
WARNING: This page is about a different car, the 2002 Toyota Avalon and 2001 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Vehicle speed sensor for Anti-Lock Brake System (ABS) detects wheel speed and sends appropriate signal to ABS ECU. ABS ECU converts and sends a 4-pulse signal to instrument cluster, which then outputs a 4-pulse signal to ECM. ECM determines vehicle speed based on frequency of pulse signals. DTC is set when ECM does not detect a signal while vehicle is in motion. Possible causes are:
- Open or short in vehicle speed sensor circuit.
- ABS speed sensor.
- Instrument cluster malfunction.
- ECM malfunction.
- ABS ECU malfunction.
- Internal transaxle malfunction.