CUMMINS ECM REPAIR TIPS

[Thecell]

I am trying to build a bench cable for a cummins 3963994 ecm.This is on a dodge isb 2003 common rail.I cannot even find out what model ecm it is.I need to know if there is a j1939 line on this ecm and if so,anyone has a wiring diagram for it.It has 50 pin and a 60 pin connector.Any input would be great!Thanks!

T,

Thanks for your help bud.

Do you have the serial number of the engine. We worked on a dodge one time and it was not to any spec cummins had...if you need either of those plugs let me know and you got them...

Bob

[ddmech]

No I dont have a serial.We have checked the usual spots on the engine and no luck.Tag gone.I have everything to build the plug but need to know how to connect.I found the pinout in chrysler manual but it doesnt match any cummins schem.

21,49,50 - ground
20,30,40 + pos
32 ign

28 pci bus
16 sci transmit
19 sci recieve

Doesnt show a 1939 or 1708.Any ideas buddy?

[Thecell]

No I dont have a serial.We have checked the usual spots on the engine and no luck.Tag gone.I have everything to build the plug but need to know how to connect.I found the pinout in chrysler manual but it doesnt match any cummins schem.

21,49,50 - ground
20,30,40 + pos
32 ign

28 pci bus
16 sci transmit
19 sci recieve

Doesnt show a 1939 or 1708.Any ideas buddy?

I have a wiring diagram of the cummins side and the dodge side of it back at the office. I should be back friday and can pm them to you. there is a 1939 on the plug but it is in a different location than normal for cummins. We had to build a plug system to work with it and it took 3 times even with diagrams before we were able to communicate with the ecm.

any other numbers on the ecm? as sometimes they lead to the sn of the engine.

[ddmech]

Yes there is a tag on the ecm.I will check it out in the mornig and get back with you.Thanks a lot!

[Thecell]

I have a wiring diagram of the cummins side and the dodge side of it back at the office. I should be back friday and can pm them to you. there is a 1939 on the plug but it is in a different location than normal for cummins. We had to build a plug system to work with it and it took 3 times even with diagrams before we were able to communicate with the ecm.

any other numbers on the ecm? as sometimes they lead to the sn of the engine.

From the engine we did ...off the cummins site:

J1939 Engine Plug 08 Engine Datalink +
Engine Plug 06 Engine Datalink -

OEM power plug:
01, 02 12 Volt -
03,04 12 volt +
ignition 39 OEM PLUG

anything else, let me know.

[moza]

I'm looking for calibration isx. as no vgt dpf and how to remove ...
thank you my friends .. there are lots of good information.

[Thecell]

If it stars taking the same calibration that is installed, when the message preparing ecm for calibration shows up and finishes, pull the 4 wire power plug. Make sure every epa cert is moved into the list. Don't wait the thirty seconds. Plug it back in and restart calibration right away using a fleet count. In 2007, I watched a Cummins tech do the same thing but the first ecm smoked <literally> when starting the engine before he caught his mistake.

ALSOP.. We have a cm870 with the same issue as JTECH. Both in insite and calterm. The ECM will communicate with them both but in boot mode. Tried all of the above plus even bought the cummins bench cable (wow$$$). The ECM was perfect until We started playing with it to find the limits, so it should be ok...IDEAS?

Thanks Guys.

[ddmech]

Can you calibrate it in boot friend?

[Thecell]

Can you calibrate it in boot friend?

No, Bud... it will let it prepare it, and all is good until it trys to transfer the calibration. Then it shows as a failed to transfer calibration error. Really baffling.

[Thecell]

I have a CM850 ECM 3965159 that somebody tried to calibrate with a calibration for ECM 4921667.
the ECM communicates OK with Insite and Calterm, it has no calibration in it at present, and will not take a clibration with Insite or Calterm, I have tried Rom Boot cables, 5EED and 1D0A with Calterm,
anybody got any other ideas?

JCTECH,

Did you ever get that resolved, as we have the same thing (Caused by me on the bench)? It is an CM870.

[alsop]

JCTECH,

Did you ever get that resolved, as we have the same thing (Caused by me on the bench)? It is an CM870.

I have had problems with Insite 7.5. It is extremely unstable for calibrations and work orders. Move every EPA certification into the right side box.
Make sure the CPL is a match with the original calibration. Last use a 12 volt battery in place of a power supply for the amperage . I would still go back to 7.4 to calibrate. One calibration installed 75% with 7.5 and the laptop simply shut down and rebooted. Version 7.4 without any updates took the re-calibration with no problems. This was on a CM871 with an ISM, CARB. certification. Also stay away from USB and use RS232 com1, J1708 Not J1939 for interface communications. My best instinct is the J1708 is your problem. This ECM will read J1939 but will not calibrate unless 1708 is used.
Keep us up to date how things work out.
Thanks.

[Thecell]

I have had problems with Insite 7.5. It is extremely unstable for calibrations and work orders. Move every EPA certification into the right side box.
Make sure the CPL is a match with the original calibration. Last use a 12 volt battery in place of a power supply for the amperage . I would still go back to 7.4 to calibrate. One calibration installed 75% with 7.5 and the laptop simply shut down and rebooted. Version 7.4 without any updates took the re-calibration with no problems. This was on a CM871 with an ISM, CARB. certification. Also stay away from USB and use RS232 com1, J1708 Not J1939 for interface communications.
Keep us up to date how things work out.
Thanks.

ALSOP,

Thanks for the quick response. We have a 30 amp power supply on the bench...we can see that it takes 2.1 amps at 14 volts. We also tried it at 15 volts just to give it the additional Umph it may need (nice technical term).
We are using insite 7.4 for exactly the same reasons you describe above. We have tried it with NEXIQ and INLINE 6 (which is a POS, and I don't mean point of sale)....

So our next trick is still yet to be determined, one hell of a learning experience but would like to be able to come to some resolution on how to calibrate.
So once again, thanks for the great input, and yes, we will keep everyone updated as we continue to try.
BP

[alsop]

In the Intelect programs PDF guides on programming the older CM850 ECM's, about page 98 is a special instruction. The ECM must be programmed with key off. With Cummins it might apply to the CM870 version you are working with? I hope its that simple.
I also purchased the ROM Boot cable. Your not kidding $$$ WoW! The CM2250 was also a shock to the back pocket. The old saying if you want to play you have to pay really applies when it comes to Cummins.

[Thecell]

In the Intelect programs PDF guides on programming the older CM850 ECM's, about page 98 is a special instruction. The ECM must be programmed with key off. With Cummins it might apply to the CM870 version you are working with? I hope its that simple.
I also purchased the ROM Boot cable. Your not kidding $$$ WoW! The CM2250 was also a shock to the back pocket. The old saying if you want to play you have to pay really applies when it comes to Cummins.

On our way to the bench to test...

WIll let you know. Thanks

[Thecell]

Tried the switch off test, hell, I even pulled the plug during every phase of the startup...zippo.
hmmm..