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, 2D COUPE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESSELF-DIAGNOSTIC SYSTEMTROUBLE CODE DEFINITION
1991 Honda Accord DX, 2D Coupe, Standard
Trouble Code Definition
1991 Honda Accord DX, 2D Coupe, StandardSECTION Trouble Code Definition
TROUBLE CODE IDENTIFICATION CHART
| Code (1) | System Affected | Probable Cause | ||||
|---|---|---|---|---|---|---|
| 0 (2) | ECU | No signal to ECU | ||||
| 1 | O2 Sensor | Problem in O2 sensor circuit | ||||
| 3 | MAP Sensor | Electrical problem in MAP sensor | ||||
| 4 | Crank Angle Sensor (CRANK) | Open or shorted signal circuit | ||||
| 5 | MAP Sensor | Mechanical problem in MAP sensor | ||||
| 6 | Coolant Temperature (TW) Sensor | Open or shorted signal circuit | ||||
| 7 | Throttle Angle Sensor | Open or shorted signal circuit | ||||
| 8 | Crank Angle Sensor (TDC) | Open or shorted signal circuit | ||||
| 9 | Crank Angle Sensor (CYL) | Open or shorted signal circuit | ||||
| 10 | Intake Air Temperature | Problem with sensor | ||||
| 12 | EGR System | No EGR action | ||||
| 13 | Atmospheric Pressure (PA) | Problem with PA circuit | ||||
| 14 | Electronic Air Control Valve (EACV) | Open or shorted signal circuit | ||||
| 15 | Ignition Output Signal | Electrical problem in signal circuit | ||||
| 16 | Fuel Injector | Problem in fuel injector circuit | ||||
| 17 | Vehicle Speed Sensor (VSS) | Open or shorted signal circuit | ||||
| 20 | Electrical Load Detector | Problem with electrical load detector circuit | ||||
| 30 | A/T FI Signal A | Problem in A/T control unit and ECU circuit | ||||
| 31 | A/T FI Signal B | Problem in A/T control unit and ECU circuit | ||||
| 41 | O2 Sensor Heater | Problem with O2 sensor circuit | ||||
| 43 | Fuel Supply System | Problem with O2 sensor circuit or fuel system | ||||
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RENDER: 1.0x
NO RELATED
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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.