Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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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 OPERATIONTROUBLE CODE MEMORY
1985 Chevrolet G 30 Van V8-305 5.0L
Trouble Code Memory
1985 Chevrolet G 30 Van V8-305 5.0LSECTION Trouble Code Memory
The ECM is capable of sensing certain system malfunctions, storing data related to these malfunctions in the trouble code memory and alerting the operator of the malfunctions through the instrument panel mounted "Check Engine" lamp. If a system malfunction occurs while the engine is running, the ``Check Engine'' lamp will light and a trouble code will be stored in the ECM memory. The lamp will remain on with the engine running until malfunction is corrected. If the malfunction is intermittent, the lamp will go out but the code will remain stored in the trouble code memory.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • 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.