2001 caravan no start

I have a 2001 caravan 3.3l in the shop at the moment that will crank but
will not start. trouble codes are p0351, p0352, and p0353. all are active
and relate to the ignition coil primary circuits. when checking at coil pack
4 way connector when disconnected I have ASD control when cranking but no
pulse at primary circuit drivers. have checked drivers at pcm connectors
and still no pulse. scoped cam and crank sensors which give good patterns
and are in sync as verified with DRB scan tool. fused B+ and ASD control at
PCM and both ground circuits for PCM check out ok. any thoughts guys ?
cheers the rebelmc.

 

Assuming you have 12volts at the ASD relay output. Crank the engine for 5
seconds as you check the ignition coil driver circuit, the test lite should
flicker, If the lite flickers while cranking but wont start, replace the
coil.If it does not flicker measure the ignition coil driver circuit from
the coil to the PCM. The resistance should be below 5.0 ohms. If it isn't,
repair the wire. If it is below 5.0 ohms measure the resistance between the
ground and the ignition coil driver circuit, If the resistance is below 100
ohms repair the coil driver circuit for a short to ground.If it isn't below
100ohms replace the PCM

Glenn Beasley
Chrysler Tech

 

Hi Glenn. driver circuits check out ok and there is no short to ground. I
have tried a new PCM as I came to the same opinion as yourself. did not
mention it in the previous post as I was not wanting to influence any reply.

 

Were you cranking the engine when you were checking the coil driver circuit?
You may want to go back and retest the system

Glenn

 

Yes Glenn it was during cranking that I tested it. it all points to the PCM
not grounding the driver circuits but as I have replaced the PCM I am at a
loss. I was wondering whether the car has some sort of immobiliser
installed but as there is a good crank/cam signal and ASD control circuits I
cannot see how it would operate.

 

nope!! and you are getting fault codes to point you in the direction of the
problem

 

don't know if you gathered but I am in the UK and this car is US spec. is
the PCM plug and play or is there some form of configuration required.? I
have programmed the VIN but not sure of any other procedure. we have skim
security in UK but this car does not have a skim module or at least DRB says
not.

 

If you have a gray key it has skim. But still, if it had skim, the vehicle
would start and shut off if the skim wasn't programmed.You have a no start
problem. Did you install a new/reman PCM or swap out from another vehicle?

 

Black key , good point about the start and stall. the PCM is a new
replacement from Chrysler.

 

Just had another thought. I wonder if the coil pack is bad and has damaged
the new PCM to produce the same symptom.

 

You could have a bad reman PCM , they are purely junk, I have had so many
"Reman" PCM's with problems after I installed them either causing another
problem or the same problem I had before installing them. Chrysler has an
after market company "claiming they rebuild these things" Like most of the
aftermarket parts rebuilder they clean em up, paint em and ship em back out
to the shelves