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DTC - Diagnostic Trouble Codes information

P0503

Powertrain Codes

P0503 - TOYOTA - Vehicle Speed Sensor Intermittent/Erratic/High

Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - Speedomete may not work properly - Transmission shifting problem

Possible Causes

- Vehicle speed sensor rarness or connectors is open or shorted - Vehicle speed sensor - Combination meter - Faulty ECM.

When Detected

The signal sent by the vehicle speed sensor to ECM is too high or intermittent.

Description

The vehicle speed sensor outputs a 4 pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.