The crank sensor is not an inexpensive part.... so, replacement is a last resort, unless we can PROVE it is failed... and I don't think we can.

I *think* the trans range sensor also gets a 5 volt signal from the PCM..... so, if that were shorting out somewhere down there, that would likely cause some interesting issues. Have a close look at the connector for it, make sure it is clean, and no shorts in there.

And yep, it gets a 5 volt feed from the PCM, from the same feed as MAP, and TPS. Interesting.

 

Hmm, how about that. I've got my hands on the factory manual for this year, model etc, and I don't see the connection between the map, TPS and range sensor in a5v circuit.

e connection between the map, TPS and range sensor on that 5v circuit... Where do you see this?

 

Sorry, that message and attachments may have come out a bit screwy, just getting used to this. I did run a wire from the map sensor for voltage to the pcm, but that wouldn't actually rule out a short in there, if it goes elsewhere...

 

There is a splice in there somewhere, I suspect it is S150 there, and I don't see the TPS in that diagram either......

 

Yup, here you go, you're right. I have to ask how the heck you know all this. Do you build these trucks? I've been wanting to talk to whoever designs these, I can tell you haha!

 

You say the range sensor fits into this somewhere too?

 

I'm going to inspect that s150 right now.

 

I've been working on vehicles for most of my life. Started when I was 14.... I am going to be 61 here in a few short weeks. I haven't always done it for a living, but, as I generally couldn't afford to pay someone else to work on my stuff..... I had to learn how to deal with the various and sundry problems that would crop up. It has been extremely rare that I have owned a vehicle that was built in the same decade that I owned it. Most were more than 15 years old. Some more than 20...... So yeah, I got a LOT of practice sorting through interesting problems. Learned a lot over the years.

I was at a Mensa event in St. Louis a bunch years back, and there I met an engineer that worked on GM engine design. That was an eyebrow raising revelation. I told him "I know a lot of folks that would like to kill you." He was shocked! "But, WHY????" And I pointed out stupid things like have to drop an engine cradle to change a water pump, as one bolt was so long, you couldn't get it out otherwise. Or the various parts that were extremely common failures, but were buried DEEP in the engine compartment, to the point that you had to disassemble half the car, to change a 20 dollar part. Or the fact that on the 'new' engines, changing the dern sparkplugs was 4 hours according to the Labor Time guide. That's just stupid....... I don't think our chat had any effect on how he designed engines though, witness the early 90's LT5 motor, with the starter buried under the intake manifold..... Yeah, that was a brilliant idea........

What's really depressing though, is I can usually sort out the problems of a fuel injected V-8 engine, that has more computer power than the entire Apollo program, but, a single-cylinder 2 cycle engine? I haven't gotta clue.

 

Thanks for this great message hey you. I'm away today, but will tackle more splices and connections tomorrow and keep you posted. Interesting to see the trans solenoid in the circuit with the range sensor, since it was throwing a code occasionally.

 

Let us know what ya find.