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Home >> Volkswagen >> 1990 >> Vanagon Syncro >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Control Unit (Cis-MOTRONIC) >> Power Circuits
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Power Circuits

Turn ignition off. Disconnect ECU connector. Using a voltmeter, check terminals No. 12, 14, 19 and 34 for battery voltage. If battery voltage is not present. Check fuses No. 15, 18 and 24. If fuses are okay, check for open in wiring between ECU and fuse box. See WIRING DIAGRAMS for terminal identification and wire colors.