Truck shutdown and won't restart

[Epileptic GMC]

I was at the drag strip a couple of weeks ago, and when I launched the truck just shutdown right outside the lights. Gave me a P0335 code (crankshaft position sensor) And it will not start. I've tried a new ECM and a new sensor, the low reference voltage is supposed to be .02v and I'm getting 1.5v on the wire. I'm all out of ideas, I can't find an open or short in the wire anywhere. Any ideas? I don't believe the crank is broken because the engine will turnover by hand same speed front or back, and nothing slips, the oil was clean and metal free also. Thanks guys, let me know if you have any ideas, I'm getting frustrated.

 

[Akdiesel]

Here's a bump for ya Jordan hope you got her runnin

 

[bullfrogjohnson]

Whats the cam sensor doing? Both cam and crank work off each other so they will both have to be in working order. Both sensors will operate from .5-4.5v. Anything below .5 or above 4.5 will throw a code.

 

[LBZrcks]

The only advice I can give you Jordan, is to keep Greg away from it.

 

[bullfrogjohnson]

The only advice I can give you Jordan, is to keep Greg away from it.

As in Greg from nelson diesel? What the hell happened to that guy?

 

[LBZrcks]

As in Greg from nelson diesel? What the hell happened to that guy?

yup

 

[paint94979]

As in Greg from nelson diesel? What the hell happened to that guy?

He screwed over Jason in a BIG WAY!... i won't say who's truck it was but he tried to read a locked ECM out of a very reputable persons truck which killed the ECM. He was just another another guy trying to make a buck while screwing everyone he could

 

[bullfrogjohnson]

I remember the situation. You have to watch out for the guard sheep. They will get you.

 

[Epileptic GMC]

Here's a bump for ya Jordan hope you got her runnin

Thanks bro

Whats the cam sensor doing? Both cam and crank work off each other so they will both have to be in working order. Both sensors will operate from .5-4.5v. Anything below .5 or above 4.5 will throw a code.

Cam sensor isn't popping any codes, I haven't checked it because the computer is having no issues with it. When you say both sensors will operate between .5 and 4.5v does that mean output signal?

ALso I noticed today that the primer button on the fuel filter won't stay hard more than a few min if I crank it, or even if it just sits for awhile, and I popped the bleeder screw and got air 2 days in a row. Not a lot of air, but a few bubbles.

And guys, can we please keep the stuff about who did what out of here. I'm not trying to start anything with anyone, just don't like to see people I know bashed. Not trying to offend anyone and I appreciate all the advice

 

[BLKLMM]

The only advice I can give you Jordan, is to keep Greg away from it.

Hmm............:spit:

 

[BLKLMM]

good luck Jordan:thumb: Hope you can diagnose it soon!

 

[bullfrogjohnson]

Thanks bro


Cam sensor isn't popping any codes, I haven't checked it because the computer is having no issues with it. When you say both sensors will operate between .5 and 4.5v does that mean output signal?

Yes if the ECM see's anything above or below .5v or 4.5v it will throw a code. Most likely the sensor is bad. The sensors are 3 wire sensors. You will have a 5v ecm reference signal coming in on one wire, a ground, and an output signal. You need to check both the crank and cam to make sure they are working properly.

 

[Epileptic GMC]

Yes if the ECM see's anything above or below .5v or 4.5v it will throw a code. Most likely the sensor is bad. The sensors are 3 wire sensors. You will have a 5v ecm reference signal coming in on one wire, a ground, and an output signal. You need to check both the crank and cam to make sure they are working properly.

According to GM's chart the three wires are a high ref., a low ref. and an output wire. I've replaced the sensor already, and the ECM. The low ref is supposed to have a voltage of .02, but it has 1.5v. The test for the high reference just says test light, not a voltage check. It has 12v is the high ref supposed to be a 5v ref? Because if so, thats means the high reference is wrong and ****ing with the low ref. at the same time, and there is a short somewhere to a 12v wire in the high reference.

 

[Epileptic GMC]

Yes if the ECM see's anything above or below .5v or 4.5v it will throw a code. Most likely the sensor is bad. The sensors are 3 wire sensors. You will have a 5v ecm reference signal coming in on one wire, a ground, and an output signal. You need to check both the crank and cam to make sure they are working properly.

GM's chart says that its a 12v signal coming into ckp. Is this right?

 

[TheBac]

Do the crank/cam wires run in the harness alongside the FICM? If so, could they have rubbed thru on the alternator bracket there and possibly broke or shorted out?

 

[Kspen90]

Was this issue ever fixed? Im having the same symptoms including the soft primer.