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 MANUALSPONTIAC1983GRAND PRIX BASE, 5.0 HREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 11 (FEEDBACK CARBURETOR TESTS W/CODES)CHART A5: "CHECK ENGINE" LIGHT INOPERATIVE TEST
1983 Pontiac Grand Prix Base, 5.0 H
Chart A5: "Check Engine" Light Inoperative Test
1983 Pontiac Grand Prix Base, 5.0 HSECTION Chart A5: "Check Engine" Light Inoperative Test
WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 1984 Pontiac Phoenix, 1984 Pontiac Parisienne, 1984 Pontiac Grand Prix, 1984 Pontiac Firebird, and 1984 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The following step numbers refer to the numbers in the accompanying flow chart(s).
- This checks for blown gauge fuse or open in "CHECK ENGINE" light circuit (including I.P. connector), printed circuit and CHECK ENGINE" lamp. Normal response is lamp "ON".
- This test checks for shorted ECM. Grounding ECM term. "G" will turn the "CHECK ENGINE" light "OFF". Normal response is lamp ON".
- This test checks for grounded wire from term. "C" of lamp driver to term. "G" of ECM, an open circuit to term. "B" of lamp driver, a bad ground or faulty lamp driver. Normal reading is about 9 to 11 volts.
- This test checks for open in the wire to term. "B", normal response is approximately battery voltage.
- This test checks for an open wire to term. "E" from the CHECK ENGINE" lamp. With term. "E" grounded, lamp should normally light.
- This test checks for a grounded wire from driver term. C" to ECM term. "G". Normal response is light "ON".
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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.