Initial Inspection and Diagnostic Overview

INSPECTION AND VERIFICATION

CAUTION: When working on the charging system, be sure to allow the cooling fan to shut off prior to disconnecting the battery. Severe engine damage may result due to a shortened cool-down period for the engine.

1. Verify the customer concern.

Visual Inspection Chart:

2. Visually inspect for obvious signs of mechanical or electrical damage.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. Verify the battery condition.
5. If the concern is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.

6. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
7. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- SCP+, SCP- or circuit fault; all electronic control units no response/not equipped, refer to Information Bus (Module Communications Network).
- No response/not equipped for powertrain control module (PCM), REFER to Information Bus (Module Communications Network).
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the powertrain control module (PCM).

8. If the DTCs retrieved are related to the concern, go to the PCM Diagnostic Trouble Code (DTC) Index. Diagnostic Trouble Code Tests and Associated Procedures
9. If no DTCs related to the concern are retrieved, GO to the Symptom Chart. Symptom Related Diagnostic Procedures