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 MANUALSPONTIAC1991SUNBIRD BASE, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 3.1L PFIDIAGNOSTIC FLOW CHARTS FOR CODES: 13 TO 66CODE 43, ESC ERROR WITHOUT ESC MODULENOTES
1991 Pontiac Sunbird Base, 4D Sedan, Standard
Code 43, ESC Error Without ESC Module: Notes
1991 Pontiac Sunbird Base, 4D Sedan, StandardSECTION Notes
Code 43 indicates the ECM has seen high or low voltage at circuit No. 496 for longer than 5 seconds with the engine running.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- If conditions for test as described above are being met, Code 43 will currently set and the "SES" light will be illuminated.
- The ECM has a 5-volt pull-up resistor, which should be present at the knock sensor terminal.
- This test determines if internal resistance of knock sensor is within an acceptable range.
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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.