Threaded Mode | Linear Mode

Cornhauler2 · 06-23-2023, **(Subject: 2636/SPN 641 FMI 9 )**

First post here, so here goes nothin'. I've got a CM871 CPL 2919 in a 2009 Prostar. First sign of anything wrong was the check engine light with code SPN 639 FMI 14, but was running fine. 10 miles later it billowed smoke for a few seconds and lost power. I coasted for a little bit and the engine started acting fine again. I had 35 miles home, so I just eased on home. It smoked for a few seconds several more times before I got home and the remedy was the same. At home I again checked the codes, and after doing so SPN 641 FMI 9 came up with the stop engine light and I can't seem to find the solution. ECM power and ground is stable, all harnesses are secured away from the exhaust, wiring around the DPF looks to be in good shape and secured well. Ground power and signal voltages all seem to be correct at the Turbo actuator. Between pin 6 and pin 8 at the ECM harness connector I read 122 OHMS with the turbo actuator connected to the harness. When reading between J1939+ and J1939- at the actuator with the actuator unplugged, I read 46k OHMS. The truck is all stock IE not demandated. I can only find 1 terminator/resistor in the harness and that reads 120 OHMS. Am I thinking correctly that my actuator died? Or what am I missing?

Rawze · 06-23-2023, **(Subject: 2636/SPN 641 FMI 9 )**

If you are measuring 120-ohms on the J1939 network with everything plugged in, then one of your terminating resistors is missing. This can cause damage to the turbo actuator circuit board due to excessive noise getting into the J1939 wiring. Seen it before... or at the very least, random faults or other issues with the turbo.

it should be 60 ohms.

This leads to the next question.. is the truck de-mandated?.. (deleted?).. because if some complete moron unplugged everything under the truck, or straight piped it and yanked everything out from under there .. then that is exactly why that terminating resistor is gone. -=-=Idiots-r-us dot-deletes.com

And if it IS de-mandated.. then you can rest assured that there is more than a 90% likeliness that the program is nothing but harmful, engine and/or turbo killing garbage too.

The J1939 needs BOTH terminating resistors to function 100% correctly. One is located inside the turbo actuator itself, .. and the other is typically located (or was) in the harness behind the engine, usually down near the DPF system somewhere.
ref: http://rawze.com/forums/showthread.php?t...6#pid67656

If it IS de-mandated, copy the program from the ecm and e-mail it to me for a proper review of what someone did in there.. good, bad, or downright harmful. It is nothing to take for granted.

Cornhauler2 · 06-23-2023, **(Subject: 2636/SPN 641 FMI 9 )**

Truck is factory emissions.

Rawze · 06-23-2023, **(Subject: 2636/SPN 641 FMI 9 )**

(06-23-2023 )Cornhauler2 Wrote: ...
Truck is factory emissions.

Then you need to find the wiring harness problem where the other terminating resistor is. Something is wrong.

Cornhauler2 · 06-24-2023, **(Subject: 2636/SPN 641 FMI 9 )**

(06-23-2023 )Rawze Wrote:
(06-23-2023 )Cornhauler2 Wrote: ...
Truck is factory emissions.

Then you need to find the wiring harness problem where the other terminating resistor is. Something is wrong.

I found one resistor in the harness where it crosses the transmission and that one reads 120 OHMS. So the resistor in the VGT must be bad.

ktblogistics · 06-24-2023, **(Subject: 2636/SPN 641 FMI 9 )**

key turned off
unplug actuator
should have 120ohm on actuator side and 120ohm on harness side

Cornhauler2 · 06-24-2023, **(Subject: 2636/SPN 641 FMI 9 )**

(06-24-2023 )ktblogistics Wrote: key turned off
unplug actuator
should have 120ohm on actuator side and 120ohm on harness side

So I have 120 on the harness side and 45k on the actuator side.

ktblogistics · 06-24-2023, **(Subject: 2636/SPN 641 FMI 9 )**

looks like bad actuator, theres resistor inside actuator and should be at 120ohm disconnected

Rawze · 06-25-2023, **(Subject: 2636/SPN 641 FMI 9 )**

(06-24-2023 )Cornhauler2 Wrote:
(06-24-2023 )ktblogistics Wrote: key turned off
unplug actuator
should have 120ohm on actuator side and 120ohm on harness side

So I have 120 on the harness side and 45k on the actuator side.

actuator should have 120 ohms too.

Is this a replacement actuator that was purchased somewhere and not from the OEM/stealert$it?.

I ask that because Volvo Actuators do not have the 120-ohm resistor in them, and they look identical to a cummins because they are both Holset brand.