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.
1994 Hyundai Scoupe Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Diagnostic Tests
- No Malfunction Indicator Light (Mil)
- Code 1122, 1233 Or 1234 - ECM Ram And/Or ROM Failure
- Code 2121 - Turbo Boost - Control Valve Failure
- Code 3112, 3116, 3234 Or 3235 - Fuel Injector Failure
- Code 3114 Or 3122 - IAC Motor Failure
- Code 3116 - Fuel Injector Failure
- Code 3117 Or 4151 - Airflow Sensor Or Control Failure
- Code 3121 - Turbo Boost - Pressure Sensor Failure
- Code 3122 - IAC Motor Failure
- Code 3128 - Heated Oxygen Sensor Failure
- Code 3135, 4153 Or 4154 - Purge Control Solenoid Valve Failure
- Code 3137 - Battery Or Alternator Failure
- Code 3145 - Coolant Temperature Sensor Failure
- Code 3149 - Air Conditioning System Failure
- Code 3152 Or 4156 - High Boost Pressure
- Code 3153 - Throttle Position Sensor Failure
- Code 3211, 3224 Or 3233 - Knock Sensor Failure
- Code 3222 - Phase/Camshaft Position Sensor Failure
- Code 3224 - Knock Sensor Failure
- Code 3232 - Crankshaft Position Sensor Failure
- Code 3233 - Knock Sensor Failure
- Code 3234 Or 3235 - Fuel Injector Failure
- Code 3241, 3242 Or 4155 - Miscellaneous Component Failure
- Code 4151, 4152, 4153 Or 4154 - Air/Fuel Mixture Malfunction
- Code 4155 - Miscellaneous Component Failure
- Code 4156 - Turbocharger - Control Deviation Failure
- Summary
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.