Basic Diagnostic Procedures: Notes
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 initial checks: Diagnostic Circuit Check, Driver Complaint Check and Field Service Mode Check. Any of these checks may lead to a chart for locating source of problem or indicate no problem on that check and refer to another check.
If there is no trouble in CCC system, all 3 checks will result in that conclusion. The checks and their procedures are as follows:
NOTE:
If vehicle exhibits performance problems and no codes are set, refer to the Field Service Mode Check. Components recorded by trouble codes generally do not cause performance problems when no codes are stored in ECM memory.