Skyhawk L4-112 1.8L VIN 0 TBI (1982)
Engine Control Module: Description and Operation
With Carburetor
ECM PURPOSE
The ECM is the control center of the C3 system. Its function is to monitor input information from the various sensors, process this information,
then generate output commands to the various systems that affect the vehicle performance.
PROM
The ability of the ECM to perform these functions is dependent upon a removable calibration unit called the PROM. There are specific
ECM/PROM combinations for each vehicle and they should not be interchanged.
On-Board Diagnostic Function
The ECM also performs the diagnostic function of the C3 system, alerting the driver through a "Check Engine" light should any problem in the
system arise and storing a code or series of codes which the technician uses as an aid in making repairs.
