Inspection and Verification
Inspection and VerificationNOTE:
^ The message center is also referred to as the Overhead Trip Computer (OTC).
^ The OTC must be reconfigured upon installation of a new message center. Refer to the scan tool help screen on the configuration card to program the fuel tank size.
1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical and electrical damage; refer to the chart.
3. If the concern remains after the inspection, connect the scan tool to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan 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.
4. If the scan tool still does not communicate with the vehicle, refer to the scan tool manual.
5. Carry out the DATA LINK DIAGNOSTIC TEST. If the scan tool responds with:
^ CKT914, CKT915 or CKT7O ALL ECUS NO RESP/NOT EQUIP, refer to Module Communication Network (Information Bus).
^ NO RESP/NOT EQUIP for OTC, go to Pinpoint Test B. Test B: No Communication With the Message Center
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs, and carry out self-test diagnostics for the OTC.
NOTE:
^ Before carrying out the self-test diagnostics, the headlamp switch must be turned to the full ON position and the vehicle must be running.
^ If the DTC B1342 is received, clear the DTCs and carry out the self-test again.
6. If the DTCs retrieved are related to the concern, go to the Diagnostic Trouble Code (DTC) Index to continue diagnostics. Trouble Code Diagnostic Charts - Information and Message Center
7. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics. Diagnosis By Symptom - Information and Message Center