Powertrain Diagnostic Procedures: Introduction: Notes

NOTE: The JR 2.0L/2.4L and the 2.7L are equipped with the Powertrain Control Module and Transmission Control Module combined in a single control module.
Two tools are required to diagnose and repair the PCM terminals and harness connectors:

Miller #3638 Terminal Removal Pick must be used to release the connector terminals or harness and connector damage will occur.
Miller #8815 Pinout Box must be used to probe the PCM terminals or terminal damage will occur.

The procedures contained in this service information include specifications, instructions, and graphics needed to diagnose the PCM Powertrain System. The diagnostics in this service information are based on the failure condition or symptom being present at time of diagnosis.

Please follow the recommendations below when choosing your diagnostic path.

First make sure the DRBIII® is communicating with the appropriate modules; ie., if the DRBIII® displays a No Response condition, you must diagnose this first before proceeding.
Read DTC's (diagnostic trouble codes) with the DRBIII®.
If no DTC's are present, identify the customer complaint.
Once the DTC or customer complaint is identified, locate the matching test and begin to diagnose the symptom.

All component location views are in COMPONENT LOCATIONS . All connector pinouts are in CONNECTOR PINOUTS . All system schematics are in SCHEMATIC DIAGRAMS .

An * placed before the symptom description indicates a customer complaint.

When repairs are required, refer to the appropriate service information for the proper removal and repair procedure.

Diagnostic procedures change every year. New diagnostic systems may be added; carryover systems may be enhanced. READ THIS DIAGNOSTIC INFORMATION BEFORE TRYING TO DIAGNOSE A VEHICLE CODE. It is recommended that you review the entire diagnostic information to become familiar with all new and changed diagnostic procedures.