Cutting the wire at the UCM was discussed, I decided to follow the second level support advice of replacing the harness, as I was told they "never" find the computer to be the issue.. Hindsight I would have went that route, we did try using a headlight and taillight in place of the coil/load using a...

Have ran into this before, different brand of machinery but same type issue, the fault shows up to the operator as a soft failure of can c or the engine can. Typical finds are harnessing issues near the hot side of the engine, routing issues, etc… other finds are normally a engine or exhaust sensor ...

New machine 2022-CR 7.9, yet to make it to the field, it was found that a few functions are inoperable, for this post the scope of the problem is the (DFR) dynamic feed roll / variable speed drive sheave/pulley. DFR System part of machine automation and is for the control of in-feeding crop from the...

Outstanding!!

Not sure how you know or don’t know it’s running even on all 4 cylinders, please explain what testing has been done to support this, I suggest again adding a timing sync to your WF, would also be able to rule out timing by checking a a correlation of the cmp and ckp .

That’s interesting, Mack does not use a temp sensor all temp input is from ambient and def sender, in the CNH product I have found that depending on machine model (likely due to origin of design and manufacturing) I have found info indicating some use an internal temp while other do not… imagine how...

RYM6746, no expert myself, from what I think I know, you are looking at an exh valve leak on the cylinder you were testing.. Possibly you have a timing issue, since you indicate no timing codes, no mechanical timing issue that you've found and your MAF code indicates a air flow problem. Post compres...

cant say I know anything about the particular model in question I can tell you that in heavy trucks there is a strategy called low NOx idle, in the past it caused many issues with techs trying to diagnose an issue that was not an issue but rather a strategy by the OE for NOx reduction during low coo...

Spent some time this weekend investigating a P0304 on a 1996 Toyota 4Runner 3.4L Fairly constant misfire, in all rpm ranges, used scan tool to check misfire counts, cyls 1-3 had none and cyls 5-6 would accumulate some while cyl 4 was going crazy Hooked scope up Channel 1 on cyl 4 secondary Kv Channe...

Was digging through the archives on UDS, attached some training info I had..