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 System Performance Check/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 System Performance Chart (carbureted models)/Field Service Mode Check (EFI models). Components recorded by trouble codes generally do not cause performance problems when no codes are stored in ECM memory.