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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 Inoperative >> Circuit/System Verification

Circuit/System Verification

  1. If DTCs P0480 or P0481 are set, perform those diagnostics first.
  2. Verify with a scan tool that the ECM is not commanding fan relay activation.
  3. Ignition ON, command each relay ON and OFF with a scan tool. Observe to verify that the fan turns ON and OFF with each command.
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