CUMMINS ECM REPAIR TIPS

[elecautocr]

Hi Makura

Main processor is Motorola SC38KG018CE04, Do you have datasheet of it ? and source to buy it ?

FPC(fault procesing chip) is Intel but I don't know which is the correct part number of it, Do you know ?? again source to buy it ?

Thanks

[jctech]

Hi Makura

Main processor is Motorola SC38KG018CE04, Do you have datasheet of it ? and source to buy it ?

FPC(fault procesing chip) is Intel but I don't know which is the correct part number of it, Do you know ?? again source to buy it ?

Thanks

google is your friend

[elecautocr]

This time google is not my friend

[S-GERAT]

Hi friends, I have 3 celect plus ecm with a internal short circuit (two of them was broken the last week) I supposed that this is a common failure in that kind of ecm and go to disassembly it to see if I can repair it. Anyone know if it is a commom failure ?

Thanks

[mondao]

failure in Cummins, Cummins Celect, and Celect Plus ECMs
buscando ayuda en linea me encontre estos tips talvez ayuden un poco

Corrosion and moisture:
Corrosion or damage due to moisture is one of the main reasons for ECM failure. Corrosion can enter the ECM through the wiring harness and moisture can enter by a failure in the seals in the ECM itself. This happens over a period of time (5 to 10 years) due to the ECMs exposure to the elements.
Fuel solenoid:
The electronic fuel solenoid is also a main reason for failure in the ECM. The solenoid can cause a short in the ECM due to corrosion in the solenoid or the wire running from the solenoid to the ECM harness. The electronic fuel solenoid is located at the top of the fuel pump. The solenoid seems to fail due to corrosion as fast or faster then the ECM. If your truck is running fine then you shut your engine off and it won't restart then this is a good indication that the starter has shorted out the ECM.
Injector wiring harness:
The third thing that can cause failure in the ECM is the Injector wiring harness or the sensor wiring harness. Once again corrosion or breaks in the internal wiring in the harness can cause a short in the ECM or corrosion can enter the ECM through the wiring harness. Again this is caused by exposure to the elements.
Grounding issues:
Another issue that can cause failure in the ECM is poor grounding. This can be the result of loose or corroded ground wires to the battery or the frame. This is especially problematic in the Celect Plus model.
Starters:
Replacing the starter with the wrong model starter is becoming a big problem with the Celect Plus ECMs. Many starter rebuilders will bypass the override sensor in the starter. The override sensor regulates the voltage going to the ECM so when the override sensor is bypassed you will get voltage problems in the ECM and it can generate fault codes or other problems. If you only started having problems with your ECM after installing a starter then the starter is most likely the root of your problem.
Dead battery cells:
Dead cells in batteries can cause failure in the ECM. Many times a battery is left in the rig long after a cell has died. This affects the grounding in the battery.
Jump start:
If the vehicle has been jump started recently and the cables were connected improperly this can cause a spike in your ECM and cause it to short out. A bad jump can also blow out 2 amps which are located between the ECM and the firewall.
Welding and lightning:
Arc welding on the frame can blow out the ECM as well as lightning strikes. This is not very common but it does happen from time to time.

Identifying the problem:
If your check engine light is on then you should be able to read a fault code from your ECM. The fault codes should help identify where the problem is originating from. You can also check the voltage where the wires come into the ECM harness with a voltmeter. The voltage should be between 9 to 12 volts for optimal usage. Anything 6 or below and you have a problem.

[peter21]

hi guys i have an ecm celect with code 321, i check the transistors of injectors and i found the transistor for injector number 4 with 12 volts, well i follow the circuit and i found with short cut a small diode similar to the diodes that the transformer has , i replace that for 1N4148, then i test the engine and run fine for 5 minutes, after of that time the engine shut down.
Can't to be adapted 1N4148 since do I replace of this diode?

If it is like that which I can put?

the diode are located in reverse side of pc board, near the long heat sink of the shore.

[makura]

hi guys i have an ecm celect with code 321, i check the transistors of injectors and i found the transistor for injector number 4 with 12 volts, well i follow the circuit and i found with short cut a small diode similar to the diodes that the transformer has , i replace that for 1N4148, then i test the engine and run fine for 5 minutes, after of that time the engine shut down.
Can't to be adapted 1N4148 since do I replace of this diode?

If it is like that which I can put?

the diode are located in reverse side of pc board, near the long heat sink of the shore.

Hi
well what you will need to do is get one ecm that is burnt beyond repair and take the diode from it,or take a picture of the pcb and mark the diode location,it's hard to know which one you are talking about with out a pic.

[peter21]

Hi
well what you will need to do is get one ecm that is burnt beyond repair and take the diode from it,or take a picture of the pcb and mark the diode location,it's hard to know which one you are talking about with out a pic.

hi buddy, well i have one ecm caterpillar 3126 burnt, and i see an similar diode there, i'll install that diode tomorrow and tell you how work. and tomorrow i put a picture to.

Thanks for answer my friend........

[peter21]

well guys i change the diode to my ecm cummins and i install diode from ecm cat 3126, the engine working very very good for 10 minutes, then the engine start to misfire and now my ecm have the code 322.... LMAO.... i don't know what to do..... Here a picture of the diode that i change.

ECM cummins.jpg

[rp1210a]

Those look like transistors you have circled. Where did u see part number 1N4148? You may already know but there are different types of diodes with different forward and reverse breakdown voltages (zener). Check the voltage at the diodes/transistors while truck is running and compare them to the other sets to see if the voltage is out of range.

EDIT :should have read full post, now see makura post with diode part#

[peter21]

well guys the ecm working nice now, hey rp1210 you have reason that's a transistor, am beginning in this of the electronics and tape-worm my doubt if it was a diode or a transistor, to the beginning i think that was a diode, and i test with 1n4148 and zener and same they were giving me always fault.

then i see to my friend makura say "what you will need to do is get one ecm that is burnt beyond repair and take the diode from it" I do that, i take the transistor from a caterpillar ecm, and the code 321 disappear, but appear code 322, well i check the circuit and the tests took me up to the hot sink, who is in the middle of the ecm, change it, and now the ecm works well, the code 322 disappear.......
This way that thank you very much guys for his suggestions... especially to makura, always he help me in this of repair ecm

[ECM specialist]

please can you tell me how to recalibrtion cummins part 8303 ecm , i have one active 111 -- 1 count , how to get this think clear up....
thanks again ...

I been waiting on someone to help me . to get this ecm reprogram . active 111 on 1count , I know 6662 or 8300 work's
but 8303 don't take calibration shows faild , over and over the same/ please someone help thnks to all like allways.

[hercamp]

need to rom boot ecm...before connect with insite...connecting 10,12,14 pins of b connector ..after that switch ignition on .and wait 5 seconds.u most be able to connect with insite in rom boot mode...download cal ..but u will need to know what cal file u need for ur ecm..because autodetect is dessable in rom...

[hercamp]

and ...try to answer if info was ussefulle if not ....well try to give more help

[Poptest]

I have 2 footprinted Celect Plus ECM, and I'd like to make a ROM boot harness.

Can someone please share how this harness is wired?

Thanx much.