12-09-2006, 08:03 PM
Powerstroke Diesel Enthusiast
Join Date: Dec 2006
Location: Grey Bruce County
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Diagnosing CPS/CMP problems...
I have been busy reading over many posts, and most of them that I come across seem to be Camshaft Position Sensor problems, so I thought that I would share some of my knowledge and experience in diagnosing them. I would like to hear what other members have to say as well...
What it does:
- Injection pressure and timing; fuel quantity and backpressure
- Signal for tachometer..
Symptoms (if it ISN'T a no start):
Basically the most common one is stalling/restarting with or without the check engine light coming on and conditions really dont seem to matter (quote me loosely on that one)
If I have a no start and no scanner available and I believe it is the CPS or just to eliminate the possibility of a bad CPS causing the no start, when your cranking over the truck you should see the tachometer bounce because as I said earlier the CPS sends a signal to the tachometer (a buffered signal if you want to get technical) if no bouncy tach then no signal...
Check engine light:
Codes usually are P0340, P0341 or P0344
If your lucky and get a check engine light...
Anyways hopefully this will help users to diagnose their faulty CPS, i'm not saying don't post CPS questions, i need things to do at night when I come home from work...just saying this may shed some light on their problem/question...
And if someone has made a post like this I appologize, I should have searched first....