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HOMESERVICE MANUALSCHEVROLET1985G 30 VAN V8-305 5.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONGENERAL SYSTEM DESCRIPTION
1985 Chevrolet G 30 Van V8-305 5.0L

General System Description

1985 Chevrolet G 30 Van V8-305 5.0LSECTION General System Description

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 performance of the vehicle.
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.
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.



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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.