i have a 92 525i with a rough idle .the computer was changed about 3 years
ago and now i~m not getting any signal to 2 cylinders.i thinks it`s the
computer again but i need to know about matching up the numbers so i can
try to find a used ecu.the number on the ecu i have is 261 200 402.i see
alot of ecu`s with the same first 6 numbers but the last three are
different.can anyone help or know where i can get one.thanks
Basically the number need to match. But in your case you may find it's
just the output transistors that have died, I've seen this before. You
can often rob them from a dead ECU and solder them into yours.
Who needs a life when you've got Unix? :-)
Email: firstname.lastname@example.org, John G.Burns B.Eng, Bonny Scotland
Haven't had mine apart, but have repaired early Range Rover ones, and they
use a Mosfet. That would be my choice as they're rather less likely to
short circuit damage. And although it was marked with a house number it
was easy enough to calculate a generic replacement.
However, the OP wasn't clear as to whether the fault was to an ignition
coil or injectors.
Is there a circuit diagram out there anywhere? The standard way without
would be to swap the supposed faulty drive device with a known good one
from the same ECU. However, it could also be the trigger circuit and once
you get into faulty microprocessors repairs become more tricky.
This site - although in the UK - might be of help. Some very
knowledgeable people there and they do re-cons.
*El nino made me do it
Dave Plowman email@example.com London SW
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