Initial Inspection and Diagnostic Overview

Inspection and Verification

NOTE: If a module is installed it must be reconfigured. Refer to Module Communications Network.

1. Verify the customer concern by operating the vehicle to duplicate the condition.
2. Verify the stoplamps operate correctly by applying and releasing the brake pedal with the ignition switch in the OFF position. If the stoplamps do not operate correctly, refer to Lighting and Horns. If the stoplamps operate correctly, proceed to the next step.
3. Verify that the PRNDL operates correctly on the instrument cluster. If the PRNDL does not operate correctly, refer to Instrument panel, Gauges, and Warning Indicators. If the PRNDL operates correctly, proceed to the next step.





4. Inspect to determine if one of the mechanical or electrical concerns apply.
5. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel 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 connection of the data link connector to the vehicle.
^ Check that the ignition switch is in the RUN position.
6. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
7. Carry out the diagnostic tool data link test. If diagnostic tool responds with:
^ SCP or ISO; all electronic control units no response/not equipped, refer to module Communications Network.
^ No response/not equipped for the ABS module, GO to Pinpoint Test A. Test A
^ System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the ABS module.
8. If the DTCs retrieved are related to the concern, Go to Anti-lock Brake System (ABS)/Traction Control Module Diagnostic Trouble Code Index to continue diagnostics. Diagnostic Trouble Code Tests and Associated Procedures
9. If no DTCs related to the concern are retrieved, GO to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures