Engine Speed Sensor-PCM Input

LOCATION
The engine speed (RPM) sensor is mounted to the front of engine.

PURPOSE
It generates an RPM signal to the Powertrain Control Module (PCM). The engine speed sensor input is used along with the Vehicle Speed Sensor and Throttle Position Sensor (TPS) inputs to determine when to shift the automatic transmission into and out of overdrive. The speed sensor signal is also used as an input for the Automatic Shutdown (ASD) relay (for control of generator field), vehicle speed control, torque convertor electrical engagement and instrument panel mounted tachometer.