Bad N54 water pump? - N54Tech.com

Ifreezebmx562 · 07:33 PM

Hello everybody! So today I decided to randomly check up on my codes on Carly and MHD and it wasn’t very good to say the least...��
The codes I saw from both are
Fault Explanation: Fuel pump, plausibility
Fault Code: 002E8D
Fault Explanation: Intelligent battery sensor, signal transmission Fault Code: 002DEC
Fault Explanation: Power Management, Battery Monitoring Fault Code: 002E83
Fault Explanation: Electric coolant pump, energy operation Fault Code: 002E82
Fault Explanation: Electric coolant pump, shutdown
Fault Code: 002E85
Fault Explanation: Electric coolant pump, communication
Fault Code: 002ACC
Fault Explanation: DME main relay, switching delay
So I decided to try to purge my coolant system by doing the following.
1. Turn my heater all the way up to the highest setting
2. Lowest fan speed
3. Press the gas pedal for 10-12 seconds
And I got nothing, my water pump will not even turn on... now I read that there is a fuse 30a in the DME box that I will take out later on and see if it blown.
Also keep in mind that I have a bad battery and it’s really starting to act up...
thank you for taking the time to read and hopefully update me!

tekphobia · 10-07-2019, 12:50 PM

The water pump, IBS (Intelligent Battery Sensor) and oil condition sensor all share the same bus. Sometimes when one dies, it brings down the whole bus.

You mention a bad battery; what if you try and unplug the IBS connection in the trunk and see if the WP will kick on?

08 335Ci · 10-07-2019, 06:57 PM

It's my understanding the IBS is on it's own separate digital circuit.

If the battery is weak, you won't be able to run the air bleed process without a power supply on the car.

As for your codes, replace the battery (make sure it's fully charged), register it then clear your codes and reread them. An 'iffy' battery will give you all kind of codes.

nhatnguyen14 · 10-08-2019, 01:09 PM

Check fuse F37. I had a DME main relay fault and it traces to F37. This fuses provides 12V to certain sensors and electrical components. I had my burnt open (don't know why) and I was getting all sorts of code. Or you can use newtis.info website to trace the electrical system, it's really helpful.

Ifreezebmx562 · 10-09-2019, 07:34 AM

Thank you guys for the replies, yesterday i had the battery replaced. since i replaced the battery the water pump started to work, Sadly it is time for a new water pump. its starting to go... its pumping intermittently.

08 335Ci · 10-09-2019, 08:25 AM

Quote:

Originally Posted by Ifreezebmx562

Thank you guys for the replies, yesterday i had the battery replaced. since i replaced the battery the water pump started to work, Sadly it is time for a new water pump. its starting to go... its pumping intermittently.

The pump only works when the ECM tells it to.

Does it overheat?

Ifreezebmx562 · 10-09-2019, 08:29 AM

oh wow, i thought it was supposed to be a steady flow, also no i have no over heating, I have no fans on either. the only thing i saw that raised a red flag was
i saw what seemed to be little metal particals in my expansion tank...

nhatnguyen14 · 08:14 AM

Did you do the coolant burping again after replacing the battery? If you really want to dig in, install INPA from bimmergeeks.com on a Windows 7 laptop with a K+DCAN cable, you can control your water pump 15%, 50%, or 100%, there are also lots of other things you can do in INPA.