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Home >> Acura >> 1995 >> 2.5TL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Computerized Engine Controls >> Engine Control Unit (ECM) >> Power Circuits
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Power Circuits

  1. Check for battery voltage between ECM terminal D1 and ground. If battery voltage is not present, check BACK UP fuse (10-amp), located in underhood fuse block. If fuse is okay, check for an open in White/Green wire between fuse block and control unit.
  2. Turn ignition on. Check for battery voltage between ground and ECM terminals A13 and B1. If battery voltage is not present, check ECM fuse (located in underhood fuse block). If fuse is okay, check for open in Yellow/Black wire between main relay and ECM terminals A13 and B1, defective main relay, or defective ignition switch.
  3. Connect voltmeter between ground and ECM terminal B5. Hold ignition switch in START position. Battery voltage should be present between ECM terminal B5 and ground ONLY when ignition switch is in START position.
  4. If battery voltage is not present, check fuse No. 18 (7.5-amp), located in underdash fuse block. If fuse is okay, check for an open in Blue/Red wire between fuse No. 9 and terminal B5 of control unit, or check for a defective ignition switch.
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