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DTC P0480: Low Speed Fan Control Relay Circuit: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, actuate the radiator fan relay. Is the low speed radiator fan relay operating? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  2. Turn the ignition off. Remove the low speed radiator fan relay from the PDC. Ignition on, engine not running. Measure the voltage of the (A16) fused B+ feed circuit in the PDC. Is the voltage above 11.0 volts? If yes, go to next step. If no, repair the (A16) fused B+ output circuit. Inspect the related fuse and repair as necessary.
  3. Turn the ignition off. Remove the low speed radiator fan relay from the PDC. Measure the resistance of the low speed radiator fan relay between the fused ignition switch output terminal and the low speed radiator fan relay control terminal. Is the resistance between 60-85 ohms? If yes, go to next step. If no, replace the low speed radiator fan relay.
    4. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  4. Turn the ignition off. Remove the low speed radiator fan relay from the PDC. Disconnect the PCM harness connectors. Measure the resistance of the (C24) low speed radiator fan relay control circuit from the PDC to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (C24) high speed radiator fan relay control circuit.
  5. Turn the ignition off. Remove the low speed radiator fan relay from the PDC. Disconnect the PCM harness connectors. Measure the resistance between ground and the (C27) high speed radiator fan relay control circuit in the PDC. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the (C24) low speed radiator fan relay control circuit. If no, go to next step.
  6. Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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