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 MANUALSCHEVROLET1993LUMINA APV V6-3800 3.8LREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETESTING AND INSPECTION
1993 Chevrolet Lumina APV V6-3800 3.8L
Engine Control Module: Testing and Inspection
1993 Chevrolet Lumina APV V6-3800 3.8LSECTION Testing and Inspection
On-Board Diagnostic System Check (Using A Tech 1 Scan Tool):
On-Board Diagnostic Wiring Circuit:
The on-board diagnostic system check must be the starting point for any driveability complaint diagnosis. Before using this you should perform a careful visual/physical check of the PCM and engine grounds for being clean and tight.
The on-board diagnostic system check is an organized approach to identifying a problem created by an electronic engine control system malfunction because it directs the service technician to the next logical step in diagnosing the complaint.
Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.
1. The MIL (Service Engine Soon) should be "ON" steady with the key "ON"/Engine "OFF."
2. This test ensures that the PCM recognizes the diagnostic request signal from the DLC and is controlling the MIL (Service Engine Soon) properly.
3. If an invalid DTC is displayed, the Tech 1, PCM or PROM can be at fault. "Flashing" the DTC by grounding DLC terminal "B" isolates the cause of the invalid DTC.
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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.