Crank sensor

[jwinnie]

I'm trying to troubleshoot my A/C system and the crank sensor is next on the list.

Does anyone know how to test (or bypass) this sensor? I can't find any specs on ohm readings or what the signal should be.

I'm starting to pull my hair out with the with the wiring on this thing :{

The gap is correct and the wiring looks good, I need to find out if the ecm is getting a signal.



John

 

[Moe]

when I had my 1st gen it stopped charging when the crank sensor went bad. I just replaced it and the gen circuit started charging again. The crank sensor is like a seeing eye to let the pcm know that the engine is running. If you are charging ok then I expect the crank sensor is ok. Good Luck

 

[Moe]

If the engine is charging the crank sensor is ok.

 

[jwinnie]

Well that would be the case but the truck is running a external voltage regulator so the ecm is bybassed in that respect.

 

[cerberusiam]

You can't bypass and I think it takes a scope to read what it is putting out. At least that what I was told.



You chech continuity and conections I believe. Look at the plug under the uppure radiator hose connection. The internal pieces will spread too far and it won't make contact.

 

[Philip]

You will not get a continuity reading threw the CPS. It is a normaly open switch. It closes when the gap in the balencer goes past it. If it is mountd on the engine it takes a scope to read it.



It is just and on/off switch. It puts out a square wave signal.

 

[jwinnie]

Thanks guys, That's what I needed to know. Cummins gave me the part #3924432 @ $64. 43 sound about right?



cerberusiam, you were right about that connector. The little tabs were bent out and barely touching, didn't fix it though.

 

[Philip]

Here is a write up I did on testing the CPS.



Testing Crank Position Sensor? - Dodge Cummins Diesel Forum

 

[Shadrach]

How can I run without one of these? Shadrach

 

[Greenleaf]

The last issue of the magazine has the troubleshooting method described for said sensor... ... ... ... ... Does anyone read the magazine?

 

[jwinnie]

The last issue of the magazine has the troubleshooting method described for said sensor... ... ... ... ... Does anyone read the magazine?

DOH! you're right, that would have helped. Anyway, got the new sensor in today and the A/C is working again. Thank's everyone.



John