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DTC P0481: High Speed Fan Control Relay Circuit: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, actuate the high speed radiator fan. Is the high 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 high speed radiator fan relay from the PDC. Turn the ignition on. Measure the voltage of the (A16) fused ignition switch output circuit in the PDC. Is the voltage above 11.0 volts? If yes, go to next step. If no, repair the (A16) fused ignition switch output circuit. Check and replace any open fuses.
  3. Turn the ignition off. Remove the high speed radiator fan relay from the PDC. Measure the resistance of the high speed radiator fan relay between the fused ignition switch output terminal and the high speed radiator fan relay control terminal. Is the resistance between 60-85 ohms? If yes, go to next step. If no, replace the high 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 high speed radiator fan relay from the PDC. Disconnect the PCM harness connectors. Measure the resistance of the (C27) high 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 (C27) high speed radiator fan relay control circuit.
  5. Turn the ignition off. Remove the high 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 (C27) high 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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