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.
1986 Acura Legend StandardFACTORY OEM SERVICE PROCEDURE
Electronic Engine Control System
- Description & Operation
- Trouble Shooting
- Diagnosis & Testing
- Notes
- Self-Diagnostic Codes
- Code 0, No Codes: Electronic Control Unit Test
- Code 1 & Code 2: Oxygen Sensor
- Code 3: Manifold Air Pressure Sensor
- Code 4: CRK/CYL Sensor
- Code 5: Manifold Air Pressure Sensor
- Code 6: Coolant Temperature Sensor
- Code 7: Throttle Angle Sensor
- Code 8: TDC Sensor
- Code: 9 CRK/CYL Sensor
- Code 10: Intake Air Temperature Sensor
- Code 11: Idle Mixture Adjuster Sensor
- Code 12: EGR System
- Code 13: Atmospheric Pressure Sensor
- Code 14: Electronic Idle Control Valve (EICV)
- Code 15: Ignition Output Signal
- Code 17: Vehicle Speed PULSER
- Code 18: Ignition Timing Adjustment
- Wiring Diagrams
Factory Service Tools
Use the Manual With the Right Hardware
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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.