Basic Knowledge Of Tools Required

NOTE: Lack of basic knowledge of this powertrain when performing diagnostic procedures could result in incorrect diagnostic performance or damage to powertrain components. Do not attempt to diagnose a powertrain problem without this basic knowledge.

A basic understanding of hand tools is necessary in order to effectively use this information.

The control module refers to the Powertrain Control Module (PCM) or the Vehicle Control Module (VCM). The control module is designed to maintain exhaust emission levels at the Federal or California standards while providing excellent driveability and fuel efficiency. Review the components and wiring diagrams in order to determine which systems are controlled by each specific control module. The control module monitors numerous engine and vehicle functions. The control module controls the following operations:
^ The fuel control
^ The Ignition Control (IC)
^ The Knock Sensor (KS) system
^ The automatic transmission shift functions
^ The cruise control enable, if equipped
^ The generator, if equipped
^ The Evaporative Emission (EVAP) purge
^ The A/C clutch control
^ The cooling fan control