Hello everyone, it's been a while since I have had to come on here and ask for some help. Here is the story of what happened. Truck was running fine when parked a couple weeks ago. Nothing out of the ordinary while driving it last time. Tuesday my wife goes to use the truck and starts it and it runs rough and sounds terrible. So she took her other car. I have been having weak battery problems a while back but after charging them and driving the truck it was working fine. So I suspect that it's the batteries and put the charger on it over night and try again the next day. It was hard to start and it did finally start and I see what she was talking about rough idle and it would die on me.

Today I went and got new batteries and a new CPS. (I needed a spare anyway) Put the batteries in and same thing. Put the new CPS in and same. The only scanner I have is my android and torque. I set up the ICP and Inj PW and I get both on the live data so I figured that would work.

I got codes p1316, p1670, and p1280 when I checked the codes.

I have been doing a little searching and thinking it might be the IDM from the codes above.

I checked fuel bowl and I am getting fuel to the bowl but have not done a pressure check. How do I go about doing this? What adapter do I need from the fuel bowl? I have a generic pressure test kit and would need to know what size the adapter that's needed.

Also while trouble shooting earlier I disconected the ICP plug so that might be what the p1280 code is from.

I won't be able to do any more with the truck until saturday so I'm trying to get a game plan together to troubleshoot.

I plan on checking the 42 pin connector to the injectors. What else do I need to look at? Like I said I have the torque app and can use that if needed to do some more live data.

Here is a short video of what it sounds like when it does start, sometimes it runs for a while and the idle surges and sometimes it dies. I don't know if I can hurt it running like it is so I don't like to keep trying to run it for now.

<iframe width="420" height="315" src="https://www.youtube.com/embed/zxuHFBMNxdM" frameborder="0" allowfullscreen></iframe>

Thanks in advance.

Al

 

The P1316 is a generic code telling you the IDM has stored codes. To retrieve those, you need to run a KOEO or injector buzz. If I had to guess, I'd say you'll find a code for high to low side short for one or more injectors, which would cause the IDM to shut down the cylinder bank on the side generating the code. If you have no way to run tests, the first thing you'll probably want to do is check for chafing on the underside of the main wiring harness to the engine, where it crosses the left valve cover.

The P1670 can pop up after cranking with low battery voltage. The PCM is more tolerant of low voltage than the IDM, and if the IDM goes offline while cranking, the PCM loses the EF (electronic feedback) signal from the IDM and sets that code.

 

I plan on checking the harness from the 42 pin connector tomorrow and a buddy has a spare idm that I will try also.

The weird thing is it ran great when parked. And then the next time it was used is what it's doing in the video. I think it would be a failure of something more than the wiring but we'll see tomorrow.

Any other suggestions would be great.

 

Have mice?

 

Exactly what I was thinking. Devil's little fur snots. If it was a chewed wire I'd track along from IDM to UVCH connectors. If you have a voltmeter you can check continuity from the 42 pin connector to each injector pin on the harness where it connects to the UVCH. Big pins are glow plugs, small ones injectors. Center is common, injector pins are in same order as cylinders on each side. So passenger side is GP GP #7 #5 Common #3 #1 GP GP in the pic below. Hope that makes sense.

Great to have a known good IDM handy. Such kindness should be rewarded by way of cold adult beverage.

Both pressure ports are #4 ORB standard 7/16-20, IIRC. The lower one is after the filter and traditional, but either will work.

Any smoke when it runs?

 

If you have a Scan Tool, you should also monitor some PID's.

echo=on

Tools: OBD-II On-Board Diagnostics, Phase 2 Vehicle Media Communications Unit (Scanner)

1. Select the parameters indicated from the Scan Tool parameter list and monitor while cranking engine.

Data List Monitoring Parameter:
V-PWR 10.5 VDC Minimum.
RPM 100 RPM Minimum (0 - CMP Suspect)
ICP 500 PSI or 3.4 MPAM Minimum
ICPv (KOEO) Spec 0.20v - 0.30v
FUEL PW: 1 MS - 6 MS ( <1 / >6 IDM Suspect)
V-PWR - If indicating a low voltage condition, check battery voltage, charging system or power and ground circuits to the PCM.

DC% - Cranking NTE 20% / 65% is Closed. (IPR Suspect)

2. RPM - Low RPM could be an indication of starting/ charging system problems

3. No RPM indicated with the engine cranking - could be CMP circuit fault, check for DTC’s.

4. ICP - A minimum of 500 PSI (3.4 mPa) is required before the injectors are enabled. No or low oil in the reservoir, system leakage, injector O-Rings, or faulty IPR could cause pressure loss.

Note: If no RPM signal is received, IPR duty cycle will default to 14%

5. FUEL PW - Even though a 1 to 6 mS FUEL PW is shown, it’s possible the IDM did not receive the signal due to a CI or FDCS circuit fault or internal IDM failure.

IDM TESTING PROCEDURES

TEST 1:

Tools: DVOM

Measure the resistance between each power feed and each injector’s ground circuit at the IDM harness connector.
There is one power feed for each cylinder bank.

TEST 2:

Tools: DVOM

Measure the resistance between each power feed and ground. This should indicate an open circuit. If resistance is present check for
damaged valve cover gasket connectors and the wiring beneath the valve cover gaskets.

TEST 3:

Tools: Flash Light / Mirror

Check for damaged injector wiring harness; Measure the resistance between the each injector power feed and the ground shield for the
injector wires. WARNING: The wires to the injectors are shielded wire, DO NOT pierce injector wires, doing so will permanently damage the
harness.

NOTE: Nominal solenoid resistance for Powerstroke injectors is 2.9 Ohms.
This test measures entire circuit resistance which includes wire and valve cover connector resistance. All readings for the vehicle should
be consistent between each circuit.

NOTE: This test checks for injector circuits that are shorted to ground, which will cause immediate and permanent damage to the IDM module.

The resistance between these pins should be open (infinity), indicating no path to ground. This should indicate an open circuit. If resistance is present inspect the wiring harness for damage.

echo=off

 

OK got to do the pinouts for the 42 pin connector. Looks like it's open on the passenger side to the injectors. I will start ripping it apart and hope to get it fixed this week. The harness looks like it might need to be fixed/replaced to the valve covers, how big of a pain is that to replace? I might just be able to fix it it looks to have a few cracked insulation on a couple wires.

Thanks again for the help.

 

Final update, pulled the passengers valve cover and had the UVCH pulled back. Did the $0.50 mod and all is good. Back to normal for now! Still need to do the drivers side tomorrow and will be finished up. Thanks again everyone for the info/help!