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 MANUALSHONDA1990ACCORD DX, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES
1990 Honda Accord DX, 2D Coupe, Automatic
Engine Controls - Tests W/Codes
1990 Honda Accord DX, 2D Coupe, AutomaticSECTION Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Trouble Codes - PGM-FI
- Harness Connector Id
- No Check Engine Light
- Check Engine Light On
- Code 1 &/Or Code 2 - Oxygen Sensor
- Code 3 - Map Sensor
- Code 4 - Crank Angle Sensor
- Code 5 - Map Sensor
- Code 6 - Coolant Temperature (TW) Sensor
- Code 7 - Throttle Angle Sensor
- Code 8 - TDC Sensor
- Code 9 - CYL Sensor
- Code 10 - Air Temperature (Ta) Sensor
- Code 12 - EGR System
- Code 13 - Atmospheric Pressure (Pa) Sensor
- Code 14 - Electronic Air Control Valve (EACV)
- Code 15 - Ignition Output Signal
- Code 16 - Fuel Injector Circuit
- Code 17 - Vehicle Speed Sensor (VSS)
- Code 20 - Electric Load Detector
- Code 30 - A/T FI Signal A
- Code 31 - A/T FI Signal B
- Code 41 - Oxygen (O2) Sensor Heater
- Code 43 - Fuel Supply System
- Summary
- Wiring Diagram
RENDER: 1.0x
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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.