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Home >> Chevrolet >> 2009 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> DTC P0480 >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: The Circuit/System Verification must be performed first or misdiagnosis may result.
  1. Ignition OFF, disconnect the connector from the cooling fan speed control module.
  2. Ignition OFF, install a test lamp between the cooling fan speed control circuit terminal 6 and B+. The lamp should be OFF.
    • If the lamp is ON, test the cooling fan speed control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  3. Ignition ON, command the cooling fan speed from 0-100 percent with a scan tool. The brightness of the lamp should change with the commanded states.
    • If the lamp brightness does not change correctly, test the cooling fan speed control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  4. Ignition OFF, measure between the cooling fan speed control module ground circuit terminal 2 at the harness connector and ground for less than 1 ohm.
    • If greater than the specified range, repair the module ground circuit for open/high resistance.
  5. Ignition OFF, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  6. Install appropriately fused jumpers between the cooling fan harness connector terminals 1 and 4 power and ground. The cooling fan should activate at full speed.
    • If the cooling fan does not activate, replace the cooling fan.
  7. If the ECM, fan, and all circuits test normal, replace the cooling fan speed control module.
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