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Home >> Isuzu >> 1989 >> I-Mark LS >> Repair and Diagnosis >> Engine Performance >> System >> System/Component Tests - CARBURETED >> Computerized Engine Controls >> Control Unit >> ECM Ignition Power Supply
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ECM Ignition Power Supply

  1. ECM 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 fuse link B (Red) in main fuse box near battery.
NOTE: Testing of individual components does not isolate possible shorts or opens in the control harness of electronically controlled systems. Use an ohmmeter to isolate shorts or opens in harness.
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