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Old 03-09-2012, 12:05 AM   #1 (permalink)
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Question Troubleshooting Help Needed - P2146

Please Help! I'm going to try and pack a bunch of info here, so just the meat and potatoes:
I got code P2146 only, pretty much the same symptoms as everyone else.
I followed the Dodge service manual for troubleshooting the DTC which led me to replace the injector harness. For those familiar with the steps it was step #10, Low Side Driver Circuit Shorted in Injector Harness, as my low side 1, 2, and 3 are all shorted together.
So I replaced the injector harness and re-performed troubleshooting step 10 only to find the same problem still exists, so I believe that the injector harness is not my problem, but the the service manual leaves me out to dry at this point.

I have since ohm'd my injectors and all are between .4 and .6 ohm.
I have identified that the short exists somewhere between the ECM harness C1 and the injectors, but it is only evident when the circuit is complete, meaning the ECM harness is plugged into the injector harness and the injector harness is attached to all of the injectors. I have tested the ECM harness from controller end to injector harness end and there are no shorts, I have tested both the injector harnesses I have from end to end and there are no shorts in either one. I have tested the injectors and none of them are shorted to any other injector. I also checked all the involved pins and nothing is shorted to ground. When everything is hooked up, the low side control circuits of my injectors 1-2-3 are shorted together, but as soon as I disconnect the ECM harness from the injector harness, the short disappears from both ends, or if I disconnect the injectors the short disappears.

And this is where I have lost my mind. Can somebody please tell me where I've gone wrong or help me figure out what my next step should be?
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Old 03-09-2012, 01:22 PM   #2 (permalink)
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Kicking this back up top with some new info.

So I went ahead and reassembled everything with the new VC gasket/harness but minus the valve cover, thinking that maybe the short remained due to a condition created by the ECM and the still present DTC code so I intended to erase the code and check a few more things while I'm under the hood.

With all the wires hooked back up, I measured all the low side circuits to each other at the injector and the 3 in bank one are shorted together and the 3 in bank 2 are shorted together, which is really interesting since I have not received a bank 2 DTC.

So then I rescanned the codes, still only P2146, and I wiped it clear. I rechecked all the low side circuits and they were still shorted together within their banks. I started the truck up and let her idle for about 10 minutes. It sounds like something is not quite right, but I can't tell what it is. After idling for a while, no code popped up so I figured it was time for a test drive. I shut her down for a few minutes to put the valve cover back on and clean up my driveway, then I took a spin around the block and BAM, code pops again.

The code seems to pop when I come off the throttle and start coasting, but not the first time I do it. In my drive way I revved the engine to try and pop it, no dice. On the road I accelerated and backed off a few times before the code popped back up.

So now I am wondering if there is any additional test I can run on the injectors while they are in the truck to check for possibly a stuck or faulty one, or would that even cause a short? I have re-ohm'd all the injectors and they are still between .4 and .6, is there any reason to measure voltage or resistance across the injector terminals while the engine is running? Also, is there something to be said for the fact that bank 2 is exhibiting the same condition as bank 1 but there is no code for bank 2?

I will appreciate any ideas and thoughts here guys, I feel like I'm just grasping at strings now.
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Old 03-10-2012, 09:30 AM   #3 (permalink)
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Still Stumped

I guess I'm not the only one perplexed by this, or my threads not catching enough attention.

Here is my latest followup thoughts:

I've rechecked everything and found that it's not just my low side driver circuits shorted together, it is the high and low circuits in each bank. This of course starts making some sense since the high side circuits are shared at the ECM so when I connect the ECM harness to the fuel injector harness those 3 circuits should short together, but why that affects the low side is still a problem.

My sanity check question is this, If I do indeed have an injector short causing the issue, it should be evident to me on the fuel injector harness connector with all the fuel injectors attached, shouldn't it?
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Old 03-10-2012, 09:59 AM   #4 (permalink)
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Unhook the integrated gasket all together, then do an ohm test on 1-3 connections, and 1-3 injectors at the terminals. Might be lucky, and it's just the gasket.
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Old 03-10-2012, 03:02 PM   #5 (permalink)
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Thanks for the response Bill. I checked the gasket as you suggested and I see 0.1 ohm on the individual wires and none of them are shorted together, and each of the injectors ohm out to .4, .5 or .6 ohm.

Maybe I should also mention that outside of the 30 second or so moment that my truck pops the DTC code and the CEL comes on, my truck runs seemingly fine with no smoke out the tail pipes, and no noticeable knocks or misses. I have replicated the code 2 times, both times the code popped after I got off the accelerator and began coasting at normal idle.

So now I'm starting to question the troubleshooting steps. The step I question is #10:


Now, if the Injectors carry .5 ohm across their terminals, and they all share a common high side at the ECM, doesn't it stand to reason that there should be less than 1 ohm of resistance measured between any two low side circuits when they are all hooked up?


I'm beginning to think that if the troubleshooting led me astray, and the problem isn't in my wiring, then it may be intermittent in either my injectors or ECM, so is it possible for an injector solenoid to short our momentarily and then resume normal operation or is it more likely for an ECM to short out momentarily and then resume normal ops?
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Old 03-10-2012, 05:50 PM   #6 (permalink)
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OTHER DTC’S
HIGH SIDE DRIVER CIRCUIT OPEN
LOW SIDE DRIVER CIRCUIT OPEN
HIGH SIDE DRIVER SHORTED TO LOW SIDE DRIVER
HIGH SIDE DRIVERS SHORTED LOW
LOW SIDE DRIVER CIRCUIT SHORTED OTHER LOW SIDE DRIVER CIRCUIT
LOW SIDE DRIVERS SHORTED LOW
HIGH SIDE DRIVER SHORTED TO VOLTAGE
LOW SIDE DRIVER SHORTED TO VOLTAGE
LOW SIDE DRIVER CIRCUIT SHORTED IN INJECTOR HARNESS
INJECTOR
INJECTOR HARNESS
INTERMITTENT CONDITION
ECM

Have you checked between the ECM harness connection and the 1-3 injector harness? If yes, and nothing showed up, then the ECM is likely the culprit.
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Old 03-10-2012, 11:54 PM   #7 (permalink)
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Quote:
Originally Posted by BILLS06 View Post
Have you checked between the ECM harness connection and the 1-3 injector harness? If yes, and nothing showed up, then the ECM is likely the culprit.
I did check out the ECM harness between the ECM connector and the Injector Harness, and nothing came up faulty. I am fearing that a full set of injectors or and ECM purchase is in my near future, I just hope I can guess right on the first time. Unless I can find an argument otherwise, I'd almost prefer to error on the side of the injectors first, at least with almost 100K on mine I could benefit from new or upgraded injectors more than I would if I just had a new ECU that didn't fix my problem.

Thanks for your suggestions to this point, I really appreciate it!
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Old 03-11-2012, 12:01 AM   #8 (permalink)
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Install a test ecm from either a dealer or a buddies truck.

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Old 03-12-2012, 09:51 PM   #9 (permalink)
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Thanks for the suggestions guys. Unfortunately my local dealership won't fess up a spare ECM to test with and I don't know any one else with a similar truck to swap with. So today I threw in the towel and brought her to the dealer for them to diagnose. Wouldn't you know it as I was almost to the dealership the damn thing hit full on limp mode. I suppose they'll have an easier time pinpointing the issue, but we'll see what the $110 diagnosis will tell me.
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Old 03-14-2012, 02:05 AM   #10 (permalink)
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The Verdict

Well to close this thread out, the dealership says my front three injectors are sticking "at times" and the back three are leaking. This sounds fishy to me that I would happen to have issues with all the injector all of a sudden, but since I was expecting at least one bad injector I was expecting to replace the set anyhow.
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Old 03-14-2012, 04:10 AM   #11 (permalink)
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dealer shop has screwed the pooch on your truck. their diagnosis is so far off, it's funny. that dealer will keep throwing parts at your truck until your wallet is broke.

if the injector harnesses are good, then check the wiring harness cable from the valve cover injector connector to the ECM for shorts.

either the wire harness failed, shorted, or ECM injector drivers failed.

only thing worse than putting in Mopar "rebuilt" injectors is putting in Chinese injectors.
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Old 03-16-2012, 03:18 PM   #12 (permalink)
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Angry Back to square one

So far I've:
Inspected all the cables from the ECM to the Valve Cover Gasket, found no shorts
Replaced the Valve Cover Gasket Harness, fault remains
Replaced all 6 injectors, fault remains.

Any ideas?
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