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 MANUALSHONDA1991ACCORD DX, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESDIAGNOSTIC CODESNO CHECK ENGINE LIGHT
1991 Honda Accord DX, 4D Sedan, Standard
No Check Engine Light
1991 Honda Accord DX, 4D Sedan, StandardSECTION No Check Engine Light
- Turn ignition on. If oil pressure light is on, go to step 2). If light is off, inspect fuse No. 1. If fuse is okay, repair open circuit in Yellow wire between fuse and combination meter.
- Turn ignition off. Connect ECU Test Harness (07LAJ-PT3010A ) between ECU and connector. See Fig 1 . Connect terminal A13 to ground. See Fig 2 . Turn ignition on. If CHECK ENGINE light is now on, go to step 3). If light is off, replace light bulb or repair open in Green/Red wire between ECU terminal A13 and combination meter.
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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.