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Diagnostic Procedure: Notes

NOTE: If vehicle exhibits performance problems and no codes are set, refer to System Performance Chart. Components recorded by trouble codes generally do not cause performance problems when no codes are stored in ECM memory.

The CCC system should be considered as a possible source of trouble on engine performance, fuel economy and exhaust emission complaints ONLY after normal checks (which apply to a vehicle without CCC) have been performed. Diagnosis of CCC system consists of 3 types of check sheets: Diagnostic Circuit Check, Driver Complaint and System Performance Check. Any of these check sheets may lead to a chart for locating source of problem or indicate no problem on that sheet and refer to another sheet. If there is no trouble in CCC system, all 3 check sheets will result in that conclusion. The check sheets and their procedures are as follows:

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