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Home >> Isuzu >> 1989 >> Pickup 1 Ton, MSG5E >> Repair and Diagnosis >> Engine Performance >> System >> System/Component Tests - EFI >> Computerized Engine Controls >> Control Unit >> ECM Ignition Power Supply
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ECM Ignition Power Supply

  1. Main relay is activated by ignition switch and supplies battery power to ECM. On Amigo, main relay is powered through 15A fuse (No. 1) in fuse box and relay box in engine compartment. Main relay should always have power at 2 White/Blue wires from 60 amp main fuse in fuse and relay box.
  2. On Pickup, main relay is powered through 10A or 15A fuse (No. 8) in fuse box (left side of dash). Main relay should always have power at 2 White/Blue wire terminals. On Pickup, power is from 15A fuse (No. 1) in underhood fuse and relay box.
NOTE: On Pickup during cranking, battery power should be present at Yellow/Black wire of ECM 18-pin connector.
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