CUMMINS ECM REPAIR TIPS

[peter21]

well, i install the 2 news transisters and same i still have code 351 and i can't get 100 volts in the big green capacitor.

I still checking the ecm and if I find something more that this failing i tell you guys. Makura if you could give me some suggestion, I'll gratefully to you buddy.

[hercamp]

u have the ecm connect stand alone?...or you check connect to inyectors arnnes.

[peter21]

I check connect to injector harnes.

[makura]

What's the voltage you are getting on the green cap,are you getting a noise like a scream or are you getting a ticking noise?

[peter21]

well i just have 13 volts in the 2 points on the green capacitor, and i can't listen the ticking noise.

[makura]

Ok,if you look just near your actuater harness you will see a small transformer,there are two diodes(look like surface mouted transisters)one should have 17-19volts and the other 22-27volts.if not look on the far end to the left of the actuater there is a 2901,if you look propeerly you will se a 10 ohm resister labeled 100 it is usualy open circuit or one of the two diodes has coroded,if so replace with 1n4148,just trace the circuit and solder the diodes on the reverse side of the pc board.
let me as soon as you have checked these things 90% chance you will have it running after this check.

[makura]

Oh by the way once you get it going change all the electrolytic capacitors

[colh]

Hi Fella,s
I have a QSX 475 in a Case Steiger that hunts up and down at around 1650 RPM just like an old mechanical governer that overshoots and then droops under.Even under load it is still there quite bad and this is where it is used at.Been like it since new apparently not fixed under warranty and not showing any faults.any idea,s welcome.

[DiegoAC]

yeah .we..go to the service center....and close the thread
hercamp
... hilarious!
BTW, Mondao, how did you end up fixing it?
Makura, any sw to recommend for cummins electronics schematics (I mean detailed as your posts)?
Thank you all great post.

[makura]

Recalibration will solve your hunting problem,no scematics for ecms,sorry

[mondao]

yeah .we..go to the service center....and close the thread
hercamp
... hilarious!
BTW, Mondao, how did you end up fixing it?
Makura, any sw to recommend for cummins electronics schematics (I mean detailed as your posts)?
Thank you all great post.

I went to a Cummins dealer and change the ecm damaged by a new

[peter21]

Ok,if you look just near your actuater harness you will see a small transformer,there are two diodes(look like surface mouted transisters)one should have 17-19volts and the other 22-27volts.if not look on the far end to the left of the actuater there is a 2901,if you look propeerly you will se a 10 ohm resister labeled 100 it is usualy open circuit or one of the two diodes has coroded,if so replace with 1n4148,just trace the circuit and solder the diodes on the reverse side of the pc board.
let me as soon as you have checked these things 90% chance you will have it running after this check.

thank you soo much buddy, i check the diodes and i found 1 with problem , but i change the 2 diodes and all the electrolytic capacitor, and now working fine.........


now the green capacitor have 105 volts, and i can listen the ticking noise.

[makura]

thank you soo much buddy, i check the diodes and i found 1 with problem , but i change the 2 diodes and all the electrolytic capacitor, and now working fine.........


now the green capacitor have 105 volts, and i can listen the ticking noise.

Hey you are welcome,now you know how to repair a celect ecm.

[elecautocr]

Hello members:

In some Celect and Celect Plus ECMs I had the error code 343 (microprocessor comunication error inside ECM). I tried to fix it with changing new memories (with good know files) , changing capacitors re-solder the main processor but the problem persist.

Do any of you have experience with error 343 ??

Any ideas to solve it ?

[makura]

Hello members:

In some Celect and Celect Plus ECMs I had the error code 343 (microprocessor comunication error inside ECM). I tried to fix it with changing new memories (with good know files) , changing capacitors re-solder the main processor but the problem persist.

Do any of you have experience with error 343 ??

Any ideas to solve it ?

343 replace main micro procesor,or FPC(fault procesing chip)its the big plccc chip in between the main proceser and the eeproms