LEMON Manuals: Even more car manuals for everyone
Home >> Chrysler >> 2003 >> PT Cruiser Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0480: Low Speed Fan Control Relay Circuit (Turbo) >> Testing

DTC P0480: Low Speed Fan Control Relay Circuit (Turbo): Testing

  1. Turn the ignition on. With the DRBIII® scan tool, actuate the radiator fan. Is the radiator fan operating? If yes, go to next step. If no, go to step  3.
  2. Turn the ignition on. With the DRBIII® scan tool, actuate the radiator fan. Wiggle the wiring harness from the radiator fan motor to the PCM while the relay is actuating. Did the radiator fan stop when wiggling the wiring harness? If yes, repair as necessary. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  3. Turn the ignition off. Disconnect the radiator fan harness connector. Using a 12-volt test light connected to battery voltage, probe the (N23) radiator fan control circuit in the radiator fan harness connector. With the DRBIII® scan tool, actuate the radiator fan. Does the test light illuminate brightly and flash on and off? If yes, go to next step. If no, go to step  7.
  4. Turn the ignition off. Disconnect the radiator fan harness connector. Using a 12-volt test light connected to 12-volts, probe the (Z1) ground circuit in the radiator fan harness connector. Does the test light illuminate? If yes, go to next step. If no, repair the (Z1) ground circuit for an open.
    5. NOTE: Inspect the radiator fan fuse located in the PDC. If OK continue, if not replace.
  5. Turn the ignition off. Disconnect the radiator fan relay harness connector. Using a 12-volt test light connected to ground, probe the (A110) fused B+ output circuit. Does the test light illuminate brightly? If yes, go to next step. If no, repair the (A110) fused B+ circuit. Check and replace any open fuses.
  6. Turn the ignition off. Disconnect the radiator fan harness connector. Turn the ignition off. With the DRBIII® scan tool, actuate the ASD relay. Using a 12-volt test light connected to ground, probe the (A142) ASD relay circuit. Does the test illuminate brightly and flash on and off? If yes, replace the radiator fan assembly. If no, repair the (A142) ASD relay output circuit. Check and replace any open fuses.
  7. Turn the ignition off. Disconnect the radiator fan harness connector. Measure the voltage of the (C24) radiator fan control circuit in the radiator fan harness connector. Does the voltmeter indicate any voltage present? If yes, repair the short to voltage in the (C24) radiator fan control circuit. If no, go to next step.
  8. Turn the ignition off. Disconnect the radiator fan harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (C24) radiator fan. Control circuit to ground in the radiator fan harness connector. Is the resistance below 5.0 ohms. If yes, repair the short to ground in the (C24) radiator fan control circuit. If no, go to next step.
    9. 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.
  9. Turn the ignition off. Disconnect the radiator fan harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (N23) radiator fan control circuit from the radiator fan harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms. If yes, before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING . If no, repair the open in the (C24) radiator fan relay control circuit.
scientia non olet · About LEMON Manuals