No Start

[albee9]

Ok here is what i have 2002 Town & country 3.8L

I can't seem to find the no start problem .

I can get the van started by way of the relay jumping pin #87 and pin #30.

it will start and run but will not start with the key only.
I checked pin#86 with ignition on and i get 12.04 then I checked #85 and did not get any thing.

yes i did change the relay before got deeper in to it .

what is a fool proof way to find the problem.

I'm leaning towards bad ground

[shorod]

Which relay did you jump, the ASD relay? Have you checked for relay coil signal relative to ground/power (depending on the relay, it may have a switched coil ground or switched positive trigger).

Have you checked for pending diagnostic codes? When started does it idle fine? When you get it started does it crank for a long time before starting, or start right up?

-Rod

[albee9]

Originally Posted by shorod

Which relay did you jump, the ASD relay? Have you checked for relay coil signal relative to ground/power (depending on the relay, it may have a switched coil ground or switched positive trigger).

Have you checked for pending diagnostic codes? When started does it idle fine? When you get it started does it crank for a long time before starting, or start right up?

-Rod

To answer your questions The first thing I did was check the codes that brought me to checking the ignition system between the switch and the starter.

the relay was the stater relay i got it to start and run jumping pins #87 and #30 and it starts right up and runs fine .
I'm checking the grounds for thr fuse box and pcm .

I read that a bad ground on the pcm could cause this problem

[Scrapper]

look down by starter and see if you see a fusable link it may have shorted out?

[albee9]

Originally Posted by Scrapper

look down by starter and see if you see a fusable link it may have shorted out?

Ok I will look

I seem to have good connections but it won't start with the key there is some thing I'm missing I checked every thing i could think of short of swapping out parts.

[shorod]

You might try shifting from Park to Neutral and see if that helps.

The fool proof way to find the problem would be to backprobe the leads to the relay, or remove the relay and check the leads, per the wiring diagram, to see which signal you don't have when you should. Once you know which terminal doesn't have the signal it should, you trace the circuit backwards from there. The PCM controls the relay coil so that could be a bit trickier, but there are only so many input to the PCM that would impact the starter circuit.

-Rod

[albee9]

Originally Posted by shorod

You might try shifting from Park to Neutral and see if that helps.

The fool proof way to find the problem would be to backprobe the leads to the relay, or remove the relay and check the leads, per the wiring diagram, to see which signal you don't have when you should. Once you know which terminal doesn't have the signal it should, you trace the circuit backwards from there. The PCM controls the relay coil so that could be a bit trickier, but there are only so many input to the PCM that would impact the starter circuit.

-Rod

Ok I'll do that and let you know how it goes.

P.S I already tried the shifter not that

[albee9]

Put my reader on the car and got code P0888 .

I need to confirm that it is the tcm causing the problem.

How can I do that??

[jpb53]

P0888= TCM power relay sense circuit. So you need to start with the trans control relay. Here is a diagram.

[albee9]

ok Thank you .

Let you know in couple days

[albee9]

Well I've checked all the wires and relays fuses, and the only i can't check is the pcm don't know if it's got a connection with the engine or not.

I have not been able to pull the codes since this started, and that was the first thing i did then checked the starting system and got nill.

[DeltaP]

Pin 85 is ground. Put a jumper from relay pin 85 to good ground. See if relay energizes and starter cranks engine when key is turned.

[albee9]

Thank you every one for your help and suggestions

It was the pdc no ground

I have a dumb question can the POWER DISTRIBUTION CENTER be taken apart for repairs.

[jpb53]

The PDC does not ground the relay; the PCM does. Here's a wiring diagram. There are a lot of reports of corrosion inside the IPM and connectors which are underneath it. Also reports of corrosion of the forward control module. IPM is what you are calling the PDC.

[albee9]

Originally Posted by jpb53

The PDC does not ground the relay; the PCM does. Here's a wiring diagram. There are a lot of reports of corrosion inside the IPM and connectors which are underneath it. Also reports of corrosion of the forward control module. IPM is what you are calling the PDC.

your right about it being called IPM, But I checked the wring between the IMP, and the PCM,and i get ground from the PCM .

So I'm thinking it's the circuit broad in the IPM