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Home >> Chevrolet >> 2011 >> 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

  1. Ignition OFF, disconnect the connector from the cooling fan speed control module.
  2. Connect a test lamp between the cooling fan speed control module ground circuit terminal B and B+. The test lamp should illuminate.
    • If the test lamp does not illuminate, test the ground circuit for open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminal C and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ fuse open, test or replace the cooling fan and motor assembly.
    4. NOTE: Use the J 35616-200:  Test Lamp for this test. If the J 35616-200:  Test Lamp is not available, use a test lamp that measures greater than 20 Ω.
  4. Ignition ON, connect a test lamp between the cooling fan speed control circuit terminal A and B+. The test lamp should not illuminate.
    • 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.
  5. Ignition ON, command the cooling fan speed to 50 percent with a scan tool. The test lamp should illuminate and flash.
    • If the test lamp does not illuminate, test the cooling fan speed control circuit for a short to voltage or for an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If all of the circuits test normal, replace the cooling fan control module.
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