Vehicle Speed Sensor: Testing and Inspection

Monitoring Procedure
The vehicle speed input from the transmission control module is monitored during deceleration of the vehicle. If no input speed is seen while all other ECM inputs (e.g. manifold pressure, neutral switch, engine RPM) indicate a moving vehicle then the vehicle speed input failure judgement is made. The diagnostic trouble code (DTC) is stored if the failure judgement is made on two successive trips.