Cummins ISX15 ECM component identification

[gfosterCA]

Morning all,

Have this ECM, p/n: 5317106 from a heavy truck.

Report was pins 84+85 were not supplying necessary constant ground. Found this traumatized component which is in-line with the GND pins in question. I've located a similar component on-board, but would like to confirm.

Anyone happen to know if references are available, or if someone might have one of these open on a bench?

Could bridge, but suspect this may be for current sensing as well.

Thanks in advance !

[stj]

Re: Cummins ISX15 ECM component identification

it's either a resistor or a polyfuse self-resetting fuse.
so something is shorted - probably in the truck wiring

[gfosterCA]

Re: Cummins ISX15 ECM component identification

it's either a resistor or a polyfuse self-resetting fuse.
so something is shorted - probably in the truck wiring

I was thinking fuse, as it's completely open between the plates. As long as this isn't a current sense circuit through a resistor, I confuse it or temporary bridge to test functionality, I agree with your concerns, something either was applied to this line that shouldn't be there or something was accidentally shorted.

[stj]

Re: Cummins ISX15 ECM component identification

there is another green thing on the board - see if it's a fuse

[gfosterCA]

Re: Cummins ISX15 ECM component identification

Resistor. Just unclear I'd this is the same component or same value.

[CapLeaker]

Re: Cummins ISX15 ECM component identification

I think you got to probe the two pads out and see what they are. Could be a fatal mistake if it was a cap and now you put a fuse or a resistor in.

[gfosterCA]

Re: Cummins ISX15 ECM component identification

Definitely not a capacitor. Either an SMD resistor or a fuse.

[redwire]

Re: Cummins ISX15 ECM component identification

If it's on a ground return, it would be a low-side current-sense resistor. You can see the instrumentation amp next to it. What are pins 84+85 going to?

Automotive ECU standard requires all pins to tolerate short to GND, short to power. I guess Cummins doesn't play by that.
I'd say 84+85 shorted to power somehow, probably mechanic pissing around.

[R_J]

Re: Cummins ISX15 ECM component identification

Can you identify the 8 pin smd ic next to the component? The burnt component might be the same as that R0499 current sense resistor, the circuit around the ic seems similar on both sides of the ic, two 102 resistors etc.

[CapLeaker]

Re: Cummins ISX15 ECM component identification

its guaranteed not a poly fuse.

[gfosterCA]

Re: Cummins ISX15 ECM component identification

Can you identify the 8 pin smd ic next to the component? The burnt component might be the same as that R0499 current sense resistor, the circuit around the ic seems similar on both sides of the ic, two 102 resistors etc.

I believe you are correct in that they are similar (or identical circuits). While this doesn't match the R0499, it does seem to match the physical characteristics of the SMD chip (SMSR040).

@redwire - these set of pins apparently go to a line heater. The current sense monitoring makes sense.

[stj]

Re: Cummins ISX15 ECM component identification

a line heater?
i would have expected something like that to have a standalone module -it's not like it's needed in most of the world

[CapLeaker]

Re: Cummins ISX15 ECM component identification

What is / was the original complaint? Heater not working?