[b.cook]

Did you verify the base pressure?

The ICP may be reading correctly.

The wire reading from the plug to the PCM should be zero. It is just wire, and should have NO ohms.



Link is in post 16.

Ok, I've pulled both the PCM and IDM. I'm sending them to Diesel Tech of Chattanooga for testing. I will report back when I get the results/parts back.

 

[b.cook]

Hello Everyone,

Sorry it took a bit to send the PCM and IDM to Diesel Tech in Chatanooga and then get them back. So both the PCM and IDM passed all of their tests, so they are not the issue.

I installed them both again and then cranked the engine with the ICP plugged in (CrankNoStart.pdf), and once with the ICP unplugged (Unplugged-ICP.pdf). The Forscan logs for both instances are attached.

I'm really struggling with where to go next here.

 

[b.cook]

@Jax Any thoughts on next steps?

 

[cjfisher]

B.cook,

Looking at the data... The ICP looks like it is basically grounded. Depending on how the AD converter is setup 0.20 volts is ground. You either have a crazy leak, somehow have air locked the HPOP, or you still have a problem in the wiring. Is there oil in the HPOP reservoir? Have you used a (5000 psi) mechanical gauge to check the high pressure oil rail? I'd recheck the wiring as well.

Cj

 

[Jax]

I agree -- Checking your wiring is the first thing. It's free (for you, your labor).

 

[Jax]

I did these tests and the only one off was that B to ground was 300 ohms not >1000.

Here is a link with Ford test data. Try these measurements.

ECSD - Injection Control Pressure (ICP) Sensor -...

Injection Control Pressure (ICP) Sensor Courtesy of: Ford Motor Company SIGNAL FUNCTIONS The Injection Control Pressure (ICP) sensor is a variable capacitance sensor that when supplied with a 5 volt reference signal from the PCM produces a linear analog voltage signal that indicates...

www.thedieselstop.com

You said yourself that "B" was almost ground! Find that short! Your truck will never start as long as the PCM reads ICP = zero!

 

[b.cook]

I did open up the harness and check all of the wiring before sending the units to Dieseltech. I ohmed all of the wires and they read correct from the ICP plug all the way to the PCM connector.

 

[Jax]

Check "b" wire continuity to ground

 

[b.cook]

@Jax

O.k., I tore the harness apart and here's what I've found.

1. Tested 'B' to ground and got a reading of 387 Ohms.
   1. Pulled plug on top of valve cover (42 PIN plug), tested again and got an inifinity reading.
2. Disconnected negative battery and unplugged PCM.
3. Tested continuity at PCM plug to disconnected 42 PIN plug on PCM side.
   1. Tested good continuity.
4. Tested Brn/Wht wire at PCM plug to ground.
   1. Received Inifinity reading.
5. Plugged 42 PIN connector back in and tested continuity on Brn/Wht wire at ICP connector to PCM plug.
   1. Received good continuity.
6. Tested Brn/Wht at ICP connector to ground.
   1. Received Inifinity reading.
7. Plugged PCM back in (battery still disconnected).
8. Tested Brn/Wht at ICP connector to ground.
   1. Received a reading of 387 Ohms.
9. Connected Neg battery leads and tested Brn/Wht at ICP connector to ground.
   1. Received a reading of 288 Ohms.

So it seems for some reason my PCM is grounding the Brn/Wht wire for the ICP. That would lead me to think I need to replace the PCM. However, the tests from DieselTech came back all good.

Perhaps this is an area they do not test?

 

[b.cook]

For those that are interested and for posterity sake, it was the IPR. When I pulled the IPR the body and main part of the IPR had separated. I could not find the little pin that is supposed to be inside the body so I replaced the IPR with a MOPAR IPR and the truck started and runs fine.

Oye!