On-Board Diagnosis: Diagnostic Trouble Codes

Data Link Connector:

A Diagnostic Trouble Code (DTC) indicates the PCM has recognized an abnormal condition in the system.

Diagnostic trouble codes are the results of a system or circuit failure, but do not directly identify the failed component or components.

Technicians must retrieve stored DTC's by connecting the DRB scan tool (or an equivalent scan tool) to the 16-way data link connector.

NOTE: For a list of DTC's, refer to Trouble Code Descriptions.

OBTAINING DIAGNOSTIC TROUBLE CODES

WARNING: APPLY PARKING BRAKE AND/OR BLOCK WHEELS BEFORE PERFORMING ANY TEST ON AN OPERATING ENGINE.

1. Connect the DRB scan tool to data link (diagnostic) connector.
2. Turn the ignition switch on, access Read Fault Screen. Record all the DTC's shown on the DRB scan tool.
3. To erase DTC's, use the Erase Trouble Code data screen on the DRB scan tool.

* Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was recorded.