248100 electric fan activation:short circuit

Fault code 248100 electric fan activation:short circuit to earth is related to the problem with electric fan. Electric fan is use to cool down heating of engine coolant system. In BMW electric fan is work on the basis of PWM (Pulse with modulation) signal. In most of vehicle there are two fan’s one is for engine cooling and the other one is for AC. But in bmw there is only one fan, it work for both engine cooling and AC (Air Conditioning) . It’s speed change speed according to the requirement. If fault code248100 electric fan activation:short circuit to earth is store in engine control module than it means fan is not working. In some model fan is directly control by engine control module, but in some model there is a relay at right side which control electric fan.

Causes of 248100 electric fan activation:short circuit :

  • Faulty control module of electric fan.
  • Blown fuse of electric fan.
  • Damage wiring harness of electric fan.
  • Faulty electric fan control relay.
  • Faulty engine coolant temperature sensor.

Symptoms :

  • Engine cooling fan will stop working.
  • Over heating problem will occur at engine.
  • AC will stop working.
  • Fault code will store in control module.

How to trouble shoot :

  • In BMW when electric fan stop working, mechanic need to check manually if there is any loose connection or any thing found repair it. If there is no loose connection or any thing found than scan fault code with the help of scan tool. When found fault code 248100 electric fan activation:short circuit to earth
  • First check connector of electric fan if it is loose than make it proper connection.
  • If fan connection is proper than start engine and switch on AC, now fan should start running if still fan is not working than place your hand on the motor of fan if it is vibrating slowly than it means that fan motor is stuck. Try to make it free so that it can work properly. But in case you did not feel any vibration at fan motor than it means fan is completely not working.
  • There might be two reason behind electric fan not completely working. One is either fan is completely dead and the other one is fan is not getting proper signal.
  • In BMW electric fan work on the basis of PWM ( pulse with modulation )signal. There are three wire’s at the connector of electric fan. 1) 12+v, 2) ground and the 3) PWM ( pulse with modulation )signal wire. Both positive and negative current are always there at electric fan connector. Direct currnet 12V+ come’s through fuse and relay, when there is no power supply found than check that fuse and relay. For working of electric fan PWM signal is require from control module. We cannot check PWM ( pulse with modulation ) signal with multimeter. If you want to check PWM signal you need other device which is capable of reading PWM signal. So that you can rectify that if there is any problem with PWM signal or not.
  • If power supply, ground and PWM signal is good but still fan is not working.
  • There is one more thing that you can do is with the help of scan tool go in engine control module from where you go to actuation test and perform test of electric fan activation. When electric fan turn ON from actuation test fan should turn ON.
  • Than the other thing in this case is faulty coolant temperature sensor. engine coolant temperature sensor send signal about temperature of engine coolant , according to which engine control module turn ON and OFF electric fan as per the requirement. Faulty engine coolant temperature sensor send wrong signal to engine control module due which either electric fan turn ON at high speed or it will not turn ON.

Solution of 248100 electric fan activation:short circuit :

  • Replace faulty electric fan.
  • Repair damage ground wire.
  • Repair or replace faulty control module.
  • Replace blown fuse.
  • Replace faulty relay.

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