Powertrain OBD System Check

IMPORTANT: Using the table correctly can reduce diagnosis time and prevent the unnecessary replacement of parts.

The Powertrain OBD System Check is an organized approach for identifying a problem. After the visual inspection is complete, perform the Powertrain OBD System Check. This Powertrain OBD System Check will provide a direction for diagnosis of the following problems:
^ A faulty PCM or an inoperative PCM
^ No serial data
^ An inoperative Malfunction Indicator Lamp (MIL)
^ Any PCM DTCs
^ A rich fuel system or a lean fuel system
^ Customer Complaint Driveability Symptoms

The Powertrain OBD System Check is a master table for driveability diagnosis and for emissions system diagnosis. Use the Powertrain OBD System Check as the starting point for any engine control system diagnosis.