Diagnostic System Check

Diagnostic Chart:

Wiring Diagram:

Circuit Description

Important: This vehicle is equipped with a Powertrain Control Module (PCM) utilizing an Electrically Erasable Programmable Read Only Memory (EEPROM). When diagnostics call for replacement of the PCM, the new PCM must be programmed.

The Diagnostic System Check is an organized approach to identifying a problem created by an electronic engine control system malfunction. The Diagnostic System Check must be the starting point for any driveability complaint diagnosis. The Diagnostic System Check directs the service technician to the next logical step in diagnosing a complaint. Do not perform this check if no driveability complaint exists. Understanding the table and using it correctly will reduce diagnostic time and prevent the replacement of good parts.