Diagnosis & Testing

CCC system diagnosis should be done in the following order:

1. Ensure that all engine systems NOT related to CCC are fully operational. DO NOT  proceed with testing until all other systems have been checked and/or repaired as needed.
2. Enter diagnostic mode and record trouble codes flashed by "CHECK ENGINE" light. Exit diagnostic mode.
3. Distinguish between "hard" and "intermittent" trouble codes.
4. If trouble codes were displayed, go to Diagnostic Circuit Check chart. Follow instructions given there.
5. If no trouble codes were recorded, go to Driver Complaint Sheet and follow instructions given there.
6. After any repairs are made, perform System Performance Check. Clear any trouble codes.