Categories: Auto Repair

BMW F10 525i CID Prompt:Battery Discharge Warning

Here share the real repair case on BMW BMW F10 525i CID Prompt:Battery Discharge Warning.

 

Vehicle information:

Model:  BMW F10 525i

Year:    2012

Mileage: 45,000 miles

Engine:  N55

 

Trouble Describtion:

“The CID prompt:battery discharge when starting the engine at first time on every morning”the customer said.

 

Technicians Diagnosis:

After driving testing,found that coolant pumps kept running at hight speed for a long time after engine off and locking car.And technicians found the pump was stopped forcibly by power management system at condition of voltage reduction.

 

And after reading the DTCs,but there was not any trouble codes releated to pump.Check the circuit diagram 1,the pump is controled by ECU.Observe the controled signal waveform(figure 2),but did not find any abnormalities.

 

Checked the temperature of cooling liquid,ECU cabin and engine oil,there was not exception exist.And if these temperature data are abnormal,then the cooling fan will rotate at hight speed,but it didn’t.

 

Finally,technicians determined the trouble was occured on the electronic pump.It was found that the pump was still running at high speed without ECU controled signal after locking car.It indicated that there were something wrong on the internal controller.

 

Trouble Solution:

Replaced the electrical pump,the trouble sloved.

auto

Recent Posts

Doosan Excavator P0408 Maximum EGR Rate Governor Deviation Error Solution

This instruction show you guide on how to solve Doosan excavator P0408 maximum EGR rate…

2 days ago

How to Calibrate 2403 Steering Valve for Fendt 800 S4 Tractor

Here is the instruction show you guide on how to calibrate 2403 steering valve for…

4 days ago

Massey Ferguson Tractor Electrohydraulic Spool Valves Configuration

This function requires all connectors to be disconnected from all electrohydraulic valves on the tractor.You…

1 week ago

How to Remove Center Joint and Center Frame for HITACHI Hitachi EX5600-7B

This instruction show you guide on how to remove center joint and center frame for…

1 week ago

How to Repair Doosan Machine P0100 DTC Signal Error

How to solve Doosan heavy duty machine P0100 fault code signal error of air mass…

2 weeks ago

How to Solve Fendt 800 Vario S4 wayline Running Slow

If the vehicle is oscillating on the wayline or catches up the wayline very slowly…

3 weeks ago