Circuit Description

PCM receives vehicle speed signal from Vehicle Speed Sensor (VSS) signal conditioner module. Signal is a square wave based on the AC signal generated by the right front wheel speed sensor. PCM provides a 5-volt pull-up and vehicle speed signal conditioner module pulls VSS output to ground to generate the signal.

DTC will set if vehicle speed signal is less than 2 MPH for 5 seconds when engine speed is 1700-3600 RPM, TP is less than one percent and engine vacuum is 70-80 kPa.