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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling >> Diagnostic Information and Procedures >> Cooling Fan Always On >> Circuit/System Verification

Circuit/System Verification

  1. Verify that the following DTCs are not set: P0480, P0481.
  2. Verify with a scan tool that the ECM is not commanding fan relay activation.
  3. Ignition ON, verify with a scan tool that the ECM is not commanding fan activation.
  4. Ignition ON, observe that the fans are not activated.
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