ignition Driver 91441 replace on ecu BMW 0261200413

[inyxon]

Hi friends of DK... I`ve a 0261200413 ecu on a BMW 325i sistem Bosch M3.1 with a ignition coil driver damage.
I tried replace it using a BU941Zp but doesn?t worck (now the coil blow up!)
As it see in the picture the bosch numbre is 91441

any Idea??

Thanks!

[easytech]

I always use Bu931 or 941 ZP.
Did you replace the coil also?
Sometimes the driver of the transistors is also damaged.

The Bosch number is 30014

[inyxon]

I always use Bu931 or 941 ZP.
Did you replace the coil also?
Sometimes the driver of the transistors is also damaged.

The Bosch number is 30014


Thanks for your quick reply. when i put the 941zp the coil start to heat... and the signal cable go to GND

[easytech]

First test the ecu/coils without the damaged transistor. (So 5 transistors in place)
Then measure the base pad on the PCB ,carfully!, if there is more than 2v the driver is damaged.
If the output is still going to ground there could be a shorted chip capacitor.
I have seen ECU's where some disigner put small chip capacitors at the connector side on the ignition outputs.

[inyxon]

PROBLEM SOLVEd!!! BU941zp is the answer... the one I userd first time was brocken... Replace by another BU941 and it worked correctly!

Thanks!

[mexanico1971]

Hi people !
got one dme like that that do not make diag and car crank but not work !
I check some parts on the ecu but nothing seems damage
car is E36 325is from 1994

all this appends after some people change gear box !



thank"s in adavnce

Br

[mexanico1971]

Hi again !
I have seach for info how to check this ecu on bench and I found this

DIYEFI.org Forum - View topic - BMW/Bosch Motronic 3.3.1 PCB overview (http://forum.diyefi.org/viewtopic.php?f=9&t=450)

I try to connect K-line in pin 88 but no luck !

I check eprom voltage and there is no voltage on the eprom

please help me width this work !

thank"s in advance

[easytech]

Which diagram you use to connect on the bench?

6+28 are ground. 26,54,56 are 12v.
Pin 87 L-line Pin88 K-line
Then at pin 59 there must be 5v.

If not check at the voltage regulator small chip next to the ignition drivers on the heatsink.
You must have 2 pins at 12v and 2 at 5v. One is the 5v power, the other 5v the reset line to the processor and the injector drivers.