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Home >> Hyundai >> 1989 >> Excel GS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> System/Component Tests >> Computerized Engine Controls >> Control Unit (Fuel Injection) >> Power Circuits
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Power Circuits

With ignition off. Disconnect ECU connector(s). Use a DVOM to probe ECU terminal connector. Check that battery voltage is present at ECU terminal A3 (back-up power). Turn ignition on and check that battery voltage is present at terminals A2 and A7. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair circuits as required.