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Home >> Isuzu >> 1989 >> I-Mark LS >> 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.
  2. On I-Mark, main relay is powered through 10A fuse (No. 13) in fuse box (left side of dash). Main relay should always have power at Red/White wire from 20 amp fuse (No. 14) in fuse box.
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