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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Self Diagnostics - 4.7L) >> Diagnostic Tests >> DTC P0480: Low Speed Fan Control Relay Circuit >> Testing

DTC P0480: Low Speed Fan Control Relay Circuit: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn the ignition on. With the DRBIII® scan tool, actuate the radiator fan relay. Is the radiator fan cycling ON and OFF? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  2. Turn the ignition off. Remove the radiator fan relay from the PDC. Measure the voltage on the (A17) Fused B+ circuits in the PDC. Is the voltage above 11.0 volts? If yes, go to next step. If no, repair the open or short in the fused B+ circuit. Inspect and replace any related fuses as necessary.
  3. Turn the ignition off. Measure the resistance of the radiator fan relay coil. Is the resistance between 60 and 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 connector. Measure the resistance of the (C24) 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) radiator fan relay control circuit.
  5. Measure the resistance between ground and the (C24) radiator fan relay control circuit at the PDC. Is the resistance below 100 ohms? If yes, repair the short to ground in the (C24) radiator fan relay control circuit. If no, go to next step.
    6. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect both the component and the PCM connectors. 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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