97 won't start sometimes P0344 and P0603 CPS is new???

[dieselkane]

I really need some input from you guys! I am helping someone with a 97 PSD, which runs sometimes, and other times it just cranks but won't start. The codes that come up when it won't start are P0344 (Camshaft Position Sensor A Circuit Intermittent (Bank 1 or Single Sensor) and P0603 (Internal Control Module KAM error). It has had three new CPS's, so it's not that.

I pulled apart the harness from the CPS, to where it feeds into the main harness and found no shorts, or damage. Where else do they tend to chafe? I am assuming it is arcing/shorted somewhere, as those are the only codes. When I watch with AE, ICP only reaches 280-300 PSI while cranking when it won't start. But Duty cycle isn't increasing, so I don't think it is leaking HP oil, or a faulty IPR. I own IDS as well, but didn't have my VCM with me. Oh, and no HP oil related codes either.

Please, anybody have any advice? This gremlin is a real SOB!!!

I also forgot to add, while cranking the tach does move.

[96F350KID]

My CPS just went out and the Tach moved too. Does he have a chip in it? If he does thats your KAM code ( Keep Alive Memory) Get a DVOM and check ohms between the wires to the IDM and the pigtail to the cps. Theirs also a TSB about the trigger rubbing the CPS did the old one have wear on it? I've also gotten Bad CPS's right outta the box BWD part# CSS626 BTW i own a GREMLIN!!

[dieselkane]

Originally Posted by 96F350KID

My CPS just went out and the Tach moved too. Does he have a chip in it? If he does thats your KAM code ( Keep Alive Memory) Get a DVOM and check ohms between the wires to the IDM and the pigtail to the cps. Theirs also a TSB about the trigger rubbing the CPS did the old one have wear on it? I've also gotten Bad CPS's right outta the box BWD part# CSS626 BTW i own a GREMLIN!!

No chip on the truck. I guess the CPS could be bad, but it is the third one he has put on the truck, and the thing keeps quitting and won't start randomly. I drove it around for quite a while without it doing it. As soon as I got back, I went to restart it and it wouldn't fire. It really acts like a short or something. I just can't find where!

[96F350KID]

It almost sounds like a PCM but do replace it till you check the ohms between the wires do you have accsess to alldata or Shop Key?

[dieselkane]

I don't have access, but I'll check the wires. What should they read again? I am thinking it may just be the PCM based on what you've said.

[96F350KID]

Wait till 5pm EST and i'll tell you i cant look em up right now