General Description

Power Control Module (PCM) Description (PCM Function):

The Powertrain Control Module (PCM) is a precision unit consisting of a one chip microprocessor, an Analog/Digital (A/D) converter, and an Input/Output (I/O) unit. The PCM is an essential part of the electronic control system. The PCM is responsible for such major functions as control of the fuel injectors, the Idle Air Control (IAC) valve, the fuel pump relay, etc. The PCM performs the OBD II diagnostic tests of the emission related systems. The PCM supplies a buffered voltage (called reference voltage) to the various information sensors and switches. The PCM controls most components with an electronic switch that completes a ground circuit when turned ON The electronic switch is commonly referred to as an output driver. The PCM is also responsible for a self-diagnosis function and a fail-safe function.

The PCM is located in the center console below the entertainment center (radio/cassette/CD player).