Another ASE test question thread

Looking for thoughts on this one - kinda kicked my ass. :blush: Linked the composite vehicle for reference.

www.ase.com/MediaLibrary/Images/PDF%20fo...site_Booklet_WEB.pdf

The composite vehicle cranks but does not start. There are no codes stored. What could be the cause?

A.) A short to ground on ECM pin 13.

B.) [insert obviously wrong answer]

C.) A short to ground on pin ECM pin 23.

D.) An open at ECM pin 80.

Eager to hear what y'all have to say.

That's another ASE brain twister for sure.

A or C could both cause a crank no start for sure, but would it set codes is the question.

Not exactly sure what ECM pin 80 is for sure, some sort of Sensing circuit?

Ro-longo wrote: A or C could both cause a crank no start for sure, but would it set codes is the question.

Not exactly sure what ECM pin 80 is for sure, some sort of Sensing circuit?

Confusing, right? I figured shorting pin 23 SHOULD set KOEO codes, but shorting pin 13 may or may not since it's a hall effect sensor? Honestly, I thought that shorting either one should set codes. :huh:

I took pin 80 to be the main ECM ground, could be wrong. :lol: Since I was thinking it's a ground, I figured the ECM just wouldn't be communicating at all if pin 80 were open.

Well, 13 pulls the 5v ref to ground. That's enough to make your 01 Dodge pick-em-up a crank no start.
A is a solid maybe.

Ooohhh, a short to ground on 23 is more of the same only more so...

PCM ground is g10 on page one. I think they only threw in the open on 80 as a choice because you can see the starter circuit from there.
Probably figure they can catch someone sleeping by making it look like it's relevant to the question...
If you follow that, it goes to "bat mon "on the starter?
Whatever, you're out of here C, take a hike!

So why does one crank sensor get a dedicated 5v line, while everyone else has to share?

I'm going with b just because it's more severe.
The motor might fire up missing one of two crank sensor inputs.

Although.... If you read the description of ckp sensor 2, it is supposed to report air temperature....
Really ASE?


EDIT
Lol, never mind. I didn't realise it was two columns!

Oh yeah, no codes....
So A I think is the better choice having reread the question.

I would have flagged that one for later for sure and come back to it after knocking some of the slow balls out of the park.
Sometimes later questions will inadvertently clue you in to how some of the other questions should have been answered.

A is my final answer. Unless I change my mind again

Hah! :lol: Well I'm glad you said that, 'cause that's what I chose, too.

I handled that question pretty much the same way you would have - worked it for a bit, went on with the rest of the test, and came back to it and the other questions I'd flagged. Kept hoping another question would give me an insight into the 5V ref on this composite vehicle, but never got one.

Good eye on the ECM ground, too! I missed that the first time around. Derp. :blush:

So I'm sure you passed with flying colors

Noah wrote: So I'm sure you passed with flying colors

Yeah, definitely passed, but not my highest ASE score, either. :lol:

It pissed me off that I didn't miss any of the actual diesel engine questions, but somehow screwed up a bunch of the electrical questions. Definitely challenging stuff on that test.