Hi
I got an issue on one of the DME motronic 1.7 of my 1991 E31 M70.
Smoke was going out from one of the DME and also the corresponding coil was smoking.....
I have open the DME, found a burned MOSFET, but i was not able to find the reference of this components on the web.
I suppose it was a internal BOSCH reference. Does someone know a compatible MOSFET reference i can use ?
IMG_4292.jpgIMG_4295.jpgIMG_4296.jpg
Thanks
Bad coils will do that.
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for the replacement for that driver,
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There's oodles of equivalents - but TIP 162 worked for me:
https://uk.farnell.com/multicomp/tip...295?ost=tip162
...or on Amazon:
https://amzn.to/3f3FGtM
Same as used on the V8's: https://www.meeknet.co.uk/E32/ECU/Index.htm
Last edited by Timm; 11-15-2020 at 03:26 PM.
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
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Ok thanks for the MOSFET reference Timm.
Hi
I received the new MOSFET, but its form factor need to be "tuned" to put it back in place inside the DME.
IMG_4326.jpgIMG_4327.jpg
The M70 is now running on 12 cylinders !
Thanks
Well done! Yes, I had to do the same on my M60 - nothing a file won't sort out!
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
My BMW Repair YouTube Channel
My Current 840ci Sport Individual
My Current 650ci Sport Individual
My E31 Repair and Information Website
My E38 Repair and Information Website
My E63/E64 Repair and Information Website
Chase - Heroes to a generation
Not that it matters much for you as you have resolved the problem.
But for those that are electronics professionals.
The correct device type is everything in identifying the appropriate substitute device.
See attached document.
The device is not a MOSFET it is a NPN Darlington Power Transistor - SOT-93 package with the heatsink tab removed.
My only suggestion in selecting a substitute is to make sure the back of the device looks the same as many devices have changed the package configuration over the years and the power dissipation ratings can be lower.
I anticipate the original DME device has bare metal exposed on the back side for best heat dissipation to the heat sink.
Some of the newer devices will be completely enclosed in plastic and hence the power rating is compromised.
Also, make sure a heatsink compound is applied to the back of the device in contact with the heatsink.
The heatsink compound substantially increases the heat transfer and thermal dissipation keeping the transistor cooler.
Last edited by m6bigdog; 11-29-2020 at 12:52 PM.
hese are special BOSCH transistors.
...buy a cheap DME (E30, E36...) and put that transistor to your DME.
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