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Inop transistor in Bosch 0 261 201 012 ignition ECU 700 1985

posted by  gfrsn on  Mon Apr 25 12:27 CST 2016
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last visit: Sun Oct 6 21:18 CST 2013
[RELATED]

Don,
Great post!
I've got a 1985 740 turbo which uses a Bosch ignition ECU p/n 0 261 201 012. After leaving me stranded several times only to start up again the car finally died completely and I had it towed home. I'm finally in a position to troubleshoot this problem. This ECU is the second one I've had; it was last replaced in December 2013. Opening it up I found no obviously fried components but on a hunch removed the largest transistor, the only one that was attached to a heat sink. It is an NPN transistor with a p/ n of ON 946. There is an open circuit, regardless of the polarity, between the base and the emitter(?) (the right leg). I emailed ON Semiconductor assuming this to be manufactured by them but they responded, "Sorry, the marking on the provided photo does not correspond to any of our products. I recommend that you ask Bosch for support." I seriously doubt I will get any assistance in response to my help request to Bosch.

I'd appreciate any suggestions on finding a suitable replacement transistor.

Gary







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