Fan 1 (Left Fan) - No High Speed Fan Operation (P0481)

If fan 1 is operating on low speed but not high speed, it indicates that the fuse and radiator fan motor are likely good. An issue with any of these would cause the fan to not operate on low speed also.

1. Turn the ignition on. Using a 12-volt test light connected to ground, back probe the high speed fan control circuit at the radiator fan 1 high relay connector. Radiator fan 1 (left) should run at high speed with the high speed control circuit grounded.
   1. If the fan runs at high speed with the control circuit grounded, it would indicate an open control circuit between the PCM and the relay connector. Isolate and diagnose the control circuit for an open or high resistance.
   2. If the fan does not operate with the control circuit grounded, continue to step 2.
2. Remove radiator fan 1 high relay from the relay connector. Load test the voltage supply at terminal 30 of the relay connector. Read the CIRCUIT LOAD TESTING PROCEDURE for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop testing a circuit. Refer to CIRCUIT LOAD TESTING PROCEDURES .

   Courtesy of CHRYSLER GROUP, LLC

   NOTE:

   A way to verify that there is no resistance in the circuit being tested is to perform a simple voltage drop test across the 3156 bulb of the load test tool. The voltage drop across the bulb should be equal to the voltage reading across the Battery terminals if there is no resistance in the circuit being tested.

   1. If the bulb is illuminated and bright, continue to step 3.
   2. If the bulb is not illuminated and bright, repair the voltage supply circuit to radiator fan 1 high relay for an open or high resistance between the PDC and relay connector.
3. Connect a fused jumper between terminal 30 and terminal 87 at the radiator fan 1 high relay connector. Radiator fan 1 should operate at high speed with the jumper in place.
   1. If the fan operates with the jumper in place, replace the relay and retest.
   2. If the fan does not operate, check and repair the radiator fan 1 high relay output circuit (N23) for an open or high resistance.