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Home >> Honda >> 1989 >> Prelude S, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> System/Component Tests - CARBURETED >> Computerized Engine Controls >> Control Unit >> Power Circuits

Power Circuits

  1. Using a voltmeter, check for battery voltage between ECU terminal B6 and ground. If battery voltage is not present, check fuse No. 38 (located in underhood fuse box). If fuse is okay, check for an open in Yellow/Blue wire between fuse box and control unit.
  2. Turn ignition switch to the "ON" position. Using a voltmeter, check for battery voltage between ECU terminal B7 and ground. If battery voltage is not present, check fuse No. 12 (located in dash fuse box). If fuse is okay, check for an open in Black/Yellow wire between fuse box and terminal B7 of control unit, or check for a defective ignition switch.
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