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DTC P0480: Low Speed Fan Relay Control Circuit: Testing

  1. Turn the ignition on, with the engine off. With the DRBIII(R), actuate the Radiator Fan Relay. Is the Radiator Fan Relay operating? If yes, stop all actuations and see INTERMITTENT FAILURES  under ON-BOARD DIAGNOSTICS. If no, stop all actuations and go to next step.
  2. Turn the ignition off. Remove the Radiator Fan Relay from the Power Distribution Center (PDC). Turn the ignition on, with the engine off. Using a 12-volt test light connected to ground, probe the Fused B+ circuits in the PDC. Does the test light illuminate brightly? If yes, go to next step. If no, repair the Fused B+ circuits as necessary. Inspect the related fuse and replace if necessary.
  3. Turn the ignition off. Measure the resistance of the Radiator Fan Relay Coil (component side). Is the resistance 60-80 ohms? If yes, go to next step. If no, replace the 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. Disconnect the PCM harness connectors. Measure the resistance of the Radiator Fan Relay Control circuit from the PDC to the appropriate terminal of the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the Raid Fan Relay Control circuit.
  5. Measure the resistance between ground and the Raid Fan Relay Control circuit in the PDC. Is the resistance less than 100 ohms? If yes, repair the short to ground in the Raid Fan Relay Control circuit. If no, go to next step.
    6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push-out. Repair as necessary.
  6. There are no possible causes remaining, replace the PCM.
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