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HOMESERVICE MANUALSHYUNDAI1990EXCEL BASE, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETHEORY AND OPERATIONENGINE CONTROLS - THEORY & OPERATIONCOMPUTERIZED ENGINE CONTROLSCONTROL UNIT
1990 Hyundai Excel Base, 2D Hatchback, Automatic

Control Unit

1990 Hyundai Excel Base, 2D Hatchback, AutomaticSECTION Control Unit

The ECU receives and processes signals from data sensors and switches to control fuel delivery. The frequency and duration of injection (fuel delivery time) is controlled by ECU. Fuel delivery time is modified for such operating conditions as cold starting, altitude, acceleration and deceleration.

NOTE: Components are grouped into 2 categories. The first category covers INPUT DEVICES, which control or produce voltage signals monitored by the ECU. The second category covers OUTPUT SIGNALS, which are components controlled by the ECU.
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.