Anyone tried fixing BMW electric water pumps?

[mfalah]

Hi!
I bought a water pump for my brothers garbage 7 series with the 6 cylinder, Surprisingly I found it very very compact and from what I learnt online; this is a very high flow water pump (around 30 litres a minute) if the claims are legit a 4 pin kostal connector will do the trick. Sadly, I have no idea where the wires go on the traditional harness on a bmw so I dont know how to throw that on on other applications. If the claims of this pump having a secret cult following are true, we got ourselves a winner.

Well, we shall remove the undertray on that specific 2006 model bmw 735 and see what voltages come out of the positive and signal pins. Till then ciao because my younger brother is a couch potato.

[stevesingo]

Any help?



The CWA Pierburg CWA 200 as fitted to the N52 engine flows 116l/min at 0.45bar.

PM me if you need more.

[mfalah]

Perfect dear, seems like you have dealt with this before. Ground from source perhapss is it 0 volt or I just use ecu ground on this? I did buy a pierburg for his bmw because the salesman was insistent.

Perhaps this pin out works on all water pumps using a kostal connector?

[stevesingo]

I have considered using one of these pumps, so I did the research a while back.

I would run the signal earth to ECU earth.

[Blu302]

What is the signal that is sent to the pump? PWM or some totally different beast?

[mfalah]

There is a 12 volt power that comes to the pin, why not send it thru a relay with 86,87 pin so it will have varied speed. Then the usual wiring it up. Set a correlation between engine speed or water temperature with the pump speed on a table and be done with it?

[stevesingo]

What is the signal that is sent to the pump? PWM or some totally different beast?

12v PWM I believe

[Blu302]

I am guessing it is the first generation pump with all the failure prone problems(cooking the electronics over time as it is in the coolant path).

The later ones run a serial communication protocol and isolate the electronics from the coolant.