Ok boys, I need help.

LLY with 9k miles has been in the shop for 8 days now. Truck started running rough, engine light came on. Truck went immediately to dealer. They put the initial code reader on and determined it is a fuel/injector issue. However, they cleaim there is another diagnostic port/connection(?) under the hood they need to hook up to figure out exactly what is wrong. What they don't have is the exact connector to do the diagnosis, and if they use the wrong connector they can do damage, so says the service manager. Does this sound legit to you guys? I will say that this dealership has an excellent reputation and other dealers send their difficult cases there to be fixed. Service manager says he has ordered this connector but because of the holidays/weather related delivery problems they still don't have this connector to do the diagnosis. Any idea what they are waiting for? I'm driving around in a 4x4 Trailblazer on their dime (actually, not a bad vehicle) but would really like my truck back. Any info. would be appreciated. Thanks in advance.
Dennis

Are they aware of the reflash?

yeah, they said they only do it if they determine it is part of the problem. They don't want to do it untill they diagnosis it. Otherwise, it could compound the problem of diagnosing it.

only thing I can think of is the return line adapters.

I think they are talking about the J 35616-94 Connector Adapter of the J 356116-B to probe the FICM connector.

I just cleared four codes yesterday including DTC P1226 (Injector 2 Output Circuit), P1229 (Inj 3 Output Ckt), P1238 (Inj 6), and P1241 (Inj 7).

I have EXACTLY the same symptoms you describe.

The funny thing is, that the day before I got the symptoms I changed the oil, oil filter, fuel filter, spin-on, and air filter. I currently have about 14,500 miles on it.

According to Helms, the DTC will set if the ECM detects an incorrect voltage for the commanded state of an injector driver.

Temperatures here were about 20 degrees and we just received about 6" of snow (the day after the oil change, etc.). We were going out to do some shopping for the day (it was Christmas eve). The truck seemed to run fine and I didn't have the predator then so I couldn't read the codes. I thought maybe I'd screwed up the fuel filter change or the oil change or something. Went back to the house briefly to check things out. Everything seemed okay, so we went out for the day. Truck seemed to run okay, but at full throttle, noticed more fuel knock and occasional rough running at higher throttle levels.

Predator showed up yesterday (thanks JK!), so I read the codes. Aside from the four previously mentioned, there were several EGR codes (from unplugging EGR, and 4" downpipe back) that I'm not worried about. Cleared the codes and started up and ran the truck a couple times. Codes and CEL came back on the last engine start cycle.

I have the Juice/Attitude installed through the entire process because I don't feel like it is affecting it either way. I also don't feel like the filter change made any difference.

Could I have a bad FICM? Or bad ECM? If I do have a bad FICM, is it pretty easy to replace? It is pretty hard to tell how the replacement would be from the Helms.

Thanks for your help, any advice appreciated. Somebody set me straight.

Dennis

take off the juice.....

anytime trouble shooting problems, remove the mods that plug n play...

Could be a connection issue at those connectors, seen it a hundred times

Okay, I'll give it a try, then what, the FICM? How much does one run anyway?

Thanks,
Dennis

Okay, just unhooked the juice, cleared the CEL, and drove it around. I don't know if it's just my imagination or what, but it seems to have more power than before stock.

CEL light came back on after second ignition cycle. Seemed to have some lower RPM knock or chatter or whatever you want to call it like before, but I couldn't really run it up to speed where I was experiencing the rough running before (although I suspect it will be similar).

I should clarify that there were no codes after I cleared them the first time (I think I mentioned codes were back after I cleared them the first time, but they weren't).

I also plugged the EGR back in just to take it as close to back to stock as possible without ripping off the exhaust.

Any ideas now?

Thanks,
Dennis

Ttt

Here is some info that may help:

Service VME - 04-05 6.6L LLY Broken #2 and #7 Injector Connector Terminals - kw SES DTC MIL P0202 P2149 P00207 P2146 P0300 wire misfire miss FICM #PIP3227 - (Nov 11, 2004)
04-05 6.6L LLY Broken #2 and #7 Injector Connector Terminals.
.

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

Service VME
.

Condition/Concern:
A condition may exist were the SES Light is on with a Low Power complaint. Codes P0202 and P2149, or P0207 and P2146. Sometimes P0300 miss fire codes are set because one engine bank is shut down.

The injector connector terminals for cylinders #2 and #7 have been found to break internally due to high vibration forces on these injectors. This creates an intermittent connection that the FICM detects and sets the appropriate P0200 code.

Since the connection can be intermittent, it may be necessary to manipulate the harness of the affected injector to duplicate the code. It is not possible to verify a broken terminal by visual inspection. Currently the injector connectors are not serviceable so the engine harness should be replaced. An injector connector service repair kit is being developed which will allow the replacement of the individual connectors. The injector terminals have been improved since May 04 production, and the harness will be changed the middle of November. The combination of these 2 changes will eliminate this failure.

Well, I figured out what is wrong with my truck. Final diagnosis is that the owner is a complete idiot. After I changed all the filters and crap the other day, I didn't plug the MAF plug back in. So, that pretty much explains why it was running the way it was. I plugged it back in this morning after I found it, and it runs great again. Cleared the CEL, and it hasn't been back in 5 or 6 ignition cycles.

Thanks to EVERYONE for your help! I love the Diesel Place!
Dennis

DMaxallitech

Excellent information! Still don't have truck back but this sounds exactly like my problem. Thanks.

Dennis

The broken injector connector can't set the P122? codes, only the P020? ones. These codes identify circuit problems between the ECM and the FICM. Look at the large connector (C107) on the drivers side of the engine near the top. Check to see if the wires coming out the back are chaffing on the sharp edge of the black bracket. If that looks good, then you most likely have some wires pinched or a few terminals on the ECM that are not making good contact.

Let us know what you find...

Here is the update (no, I still don't have my truck back),

The Fuel Injection Control Module needs to be replaced. Part is on order (say it takes 48 hours before they can ship it). Should have my truck back latest by Friday (that will be 15 days without the truck!). I think I'm bordering on MA Lemon Law status but let's see how it works out.