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Home >> Toyota >> 2003 >> Matrix Base, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - 4-Cylinder >> Engine Sensors & Switches >> Vehicle Speed Sensor >> MR2
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Vehicle Speed Sensor: MR2

  1. Wheel speed sensors on each wheel deliver an input signal to Anti-Lock Brake System (ABS) Electronic Control Unit (ECU). ABS ECU converts input signals from wheel speed sensors to a 4-pulse input signal to the instrument cluster.
  2. Instrument cluster then converts 4-pulse input signal to a rectangular waveform and then sends vehicle speed signal to Engine Control Module (ECM).
  3. If problem exists with vehicle speed signal, a Diagnostic Trouble Code (DTC) may be stored in Engine Control Module (ECM). See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
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