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 MANUALSHYUNDAI1994EXCEL BASE, AUTOMATIC, KM171REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES
1994 Hyundai Excel Base, Automatic, KM171
Engine Controls - Tests W/Codes
1994 Hyundai Excel Base, Automatic, KM171SECTION Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Diagnostic Tests
- Notes
- Code 11 & 59 - Heated Oxygen Sensor Failure
- Code 12 - Airflow Sensor Failure
- Code 13 - Intake Air Temperature Sensor Failure
- Code 14 - Throttle Position Sensor Failure
- Code 15 - Idle Speed Control Motor Position Sensor Failure
- Code 21 - Coolant Temperature Sensor Failure
- Code 22 - Crankshaft Position Sensor Failure
- Code 23 - Top Dead Center Sensor Failure
- Code 24 - Vehicle Speed Sensor Failure
- Code 25 - Barometric Pressure Sensor Failure
- Code 41 - Fuel Injector Failure
- Code 42 - Fuel Pump Failure
- Code 43 - EGR Temperature Sensor Failure
- Code 44 - Ignition Coil/Power Transistor Failure
- Summary
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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.