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Me7.5 O2 circuit Fried... trying to fix
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Topic: Me7.5 O2 circuit Fried... trying to fix (Read 10449 times)
Jim_Coupe
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Me7.5 O2 circuit Fried... trying to fix
« on: January 08, 2017, 11:20:25 AM »
Hi,
I opened my ECU (me7.5) and discovered that pin51 was coocked inside ecu.. Pin 51 is Front O2 sensor... I have now repaired the broken copper lane but still have problems.. Any ideas on IC´s or other stuff that i shall check that could be broken in the circuit for o2 sensor. ?
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E85oholic
adam-
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Re: Me7.5 O2 circuit Fried... trying to fix
« Reply #1 on: January 08, 2017, 02:18:37 PM »
It's not worth repairing.
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Jim_Coupe
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Re: Me7.5 O2 circuit Fried... trying to fix
« Reply #2 on: January 09, 2017, 07:01:49 AM »
Hehe true...I tried to refit some ic's but naaah.. These narrowband me7.5 ecus are cheap. Already have 2 new ecus on the way. But the question is whay coocked the ecus. Hmmm..
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E85oholic
jogtx16v
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Re: Me7.5 O2 circuit Fried... trying to fix
« Reply #3 on: January 09, 2017, 08:29:27 AM »
common cause is shorted wiring in o2 sensor wiring.
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Zenerdiode
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Re: Me7.5 O2 circuit Fried... trying to fix
« Reply #4 on: January 09, 2017, 01:44:55 PM »
Quote from: Jim_Coupe on January 09, 2017, 07:01:49 AM
But the question is whay coocked the ecus. Hmmm..
By far the biggest reason is the heater element in the O2 sensor fails short-circuit. This was a massive oversight on manufacturer; not to run the heater supply through a fuse.
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Jim_Coupe
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Re: Me7.5 O2 circuit Fried... trying to fix
« Reply #5 on: January 10, 2017, 04:31:41 AM »
Ok i just had that thought why didnt they fuse the damn wire.. I think ill solder a fuse on that wire just in case and throw in a new O2 sensor and check the wiring. Dont want to fry more ECUs.
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E85oholic
aef
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Re: Me7.5 O2 circuit Fried... trying to fix
« Reply #6 on: March 12, 2021, 12:42:56 AM »
Was it like this one in your case?
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