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 MANUALSHYUNDAI1990EXCEL BASE, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETHEORY AND OPERATIONENGINE CONTROLS - THEORY & OPERATIONCOMPUTERIZED ENGINE CONTROLSOUTPUT SIGNALS
1990 Hyundai Excel Base, 2D Hatchback, Automatic
Output Signals
1990 Hyundai Excel Base, 2D Hatchback, AutomaticSECTION Output Signals
NOTE:
Vehicles are equipped with different combinations of computer-controlled components. Not all components listed below are used on every vehicle. For theory and operation on each output component, refer to the system indicated in brackets after component.
The ECU processes information from the input sensors and sends appropriate voltage control signals to the following engine controls:
- A/C Clutch - See MISCELLANEOUS CONTROLS.
- Check Engine Light - See SELF DIAGNOSTIC SYSTEM
- EGR Control Solenoid Valve - See EMISSION SYSTEMS.
- Fuel Injectors - See FUEL SYSTEM.
- Fuel Pump Relay - See FUEL SYSTEM.
- Idle Speed Control Servo - See FUEL SYSTEM.
- Power Transistor - See IGNITION SYSTEM.
- Purge Control Solenoid - See EMISSION SYSTEM.
- Self-Diagnostics - See SELF DIAGNOSTIC SYSTEM.
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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.