Diagnostic Circuit Check

This system is equipped with self-diagnosis capabilities. To ensure proper diagnosis, the following testing sequence should be performed as indicated.
A system Diagnostic Circuit Check should be made first to ensure the system self-diagnosis is operating properly, to determine if the trouble codes will display and to guide diagnosis to the proper problem area.
After performing the Diagnostic Circuit Check and the ``Check Engine'' lamp did not light, refer to Drivers Complaint for an emission non-compliance problem or an engine performance problem.
Perform the System Performance Check next to check the operation of the mixture control solenoid and the Closed Loop Fuel Control System.

Fig. 4 Electronic control module terminal identification. 1983:

Fig. 5 Electronic control module terminal identification. 1984:

Fig. 6 Diagnosis circuit check:

DIAGNOSTIC CIRCUIT CHECK
During the following procedures, it may be necessary to identify the ECM terminals. Refer to Figs. 4 and 5 for identification.
Refer to Fig. 6 for Diagnostic Circuit Check.

Fig. 7 Driver complaint:

DRIVER COMPLAINT
The following procedure is to be used after performing the Diagnostic Circuit Check and if the ``Check Engine'' lamp did not light.
Refer to Fig. 7, for Driver Complaints.

Fig. 4 Electronic control module terminal identification. 1983:

Fig. 5 Electronic control module terminal identification. 1984:

Fig. 8 System performance check:

SYSTEM PERFORMANCE CHECK
During the following procedures, it may be necessary to identify the ECM terminals. Refer to Figs. 4 and 5 for identifications.
Refer to Fig. 8 for System Performance Check.