Lly ficm harness Insulate the harness with a short piece of heater hose. Sep 3, 2022 · The scalping for the LLY FICM is ridiculous, but when there is nothing available I guess you gotta expect people want to cash in. Aug 4, 2012 · I found some info on the internet about using lly heads and injectors on a 02 lb7 and using the lb7 ecm and ficm to run it using lb7 intake and turbo basicly just swapping heads and injectors and making a custom wiring harness from the ficm to the injectors and haveing the ecm retuned for the lly injectors has anyone else heard of this and has Jun 5, 2018 · 6. It will have a Delphi Automotive Under Hood Rated Fuse/Relay block with a legend and dust cover and a 5 foot long OBD Port. Be sure you insulate the harness from the bracket, as the whole problem is the FICM bracket has a sharp edge and cuts into the wires. Aug 30, 2013 · One common problem--At the side of the alternator, the FICM harness tied down with a Zip tie. Good Luck Mar 5, 2016 · "The FICM supplies high voltage to each fuel injector on the ignition voltage circuits. 4. Then once it all looks good you button it all up and protect the areas which might be rubbed again with rubber hose and zip ties. Cut the zip tie and inspect the wires inside the plastic loom. So he charged me $600 for his extra F'ing around and loading Marks tune into the LB7 ECM and watched me drive away in a cloud of smoke. com has worked to develop the cleanest solution for wiring your Duramax drivetrain for simple operation with nothing more than power, ground, ignition and cranking signals. final fix was FICM, after the new engine wiring harness. DmaxSwap. 6 disc Bose sound system, rear entertainment system, tinted windows aFe Stage II air intake system, Fingerstick, homemade 304 SS EGR blocker plate, MBRP SS downpipe (bye-bye kitty), Putco 4" SS running boards w/ dually board (I installed leds on them), Amsoil sythetic oils dual remote engine oil filters w/ 1 micron by-pass filter Jun 22, 2013 · At the passenger side of the alternator-- the FICM wire harness is tied down to the FICM bracket with a zip tie. messing with the wire harness led me down the path of bad wire(s)? did the injector connectors ect. 2L Diesel Engine Suspension & Steering - 2001 - 2010 Top Contributors this Month View All May 31, 2013 · The sharp corner of the FICM bracket can cut into the wire loom and the wires. This is the highest quality replacement module on the market! Fits 2004. Feb 26, 2007 · 2004. C. 5 LLY D/A Chevy Crew Cab Dooley long bed 4wd w/ dual alt. This is an aluminum bracket very close to the FICM connectors. May have to peel tape back and check wiring. They say there is a TSB that says that the Edge is causing the wires to heat up and possibly short out. Or what else it supplies power to. Fits: 2004. Since most fuel modules fail because of this wiring harness issue (short), these modules cannot be warranted. finally would not get out of limp mode, then not run at all. if there is someone with some knowledge of the LLY FICM electronic operation and a schematic of the circuit (with Sep 23, 2011 · If all SI diagnostics are inconclusive, inspect for wire chafes at the Fuel Injector Control Module (FICM) wiring harness brace. He said he went to pull out of his driveway and it just shut off an that was it. I can't let my truck rot in the driveway, and full engine replacement is not a reasonable option. The FICM monitors the status of the ignition voltage circuits and fuel injector command circuits. Repair and insulate the harness with a short piece of heater hose. * This harness requires ECM tuning and we recommend TCM tuning as well (see the explanation in our article Aug 13, 2012 · At the side of the alternator there is the FICM harness tied down with a Zip tie. Cut the tie and pull the wires from the harness and inspect for cuts and wear. Jul 27, 2014 · With an LLY having issues like this you literally need to go through the entire FICM harness and inspect all the wires for damage (both with a multimemter and visually). 5L Diesel Engine Duramax First Generation: 2001-2004 (LB7) Duramax Second Generation: 2004. Thanks so much for the information!! I I've read about this method for years but finally needed to do it today to my 05 LLY and it ran great all afternoon. Mar 7, 2016 · Inspect for wire harness chafes on the Fuel Injection Control Module (FICM) wiring harness retaining bracket. The wiring harness brace is located 4 to 6 inches away from the FICM connectors. Reinstall with heater hose and zip tie. Common problem with LLY engines. Jul 16, 2017 · The LLY did have a problem with the FICM harness at the passenger side of the alternator. any pinhole thats touching metal can be the issue. Oct 16, 2013 · I plan on checking continuity from the harness side of the fuse to ground and moving the harness around but would like to know what wire in the harness supplies power to the FICM. 5 LLY - EC-LB- LT - 64 gallon Aero tank, CAI, de-badged, fender vents, MikeL-6 spd-Transgo, tow mirrors, gauges- Putnam XDR, shell, BU camera, Cabin Filters, GPS, Bluetooth Feb 8, 2017 · Inspect for wire harness chafes on the Fuel Injection Control Module (FICM) wiring harness retaining bracket. Cut the tie and pull the wires out. 5-2005 GM/Duramax 2500HD,3500HD ***These are Genuine GM Harnesses, as of 10/1/2021 discontinued from factory!*** Nov 16, 2012 · The FICM wire rub is a problem with 04. I don't think the FICM needs to be programmed, just installed. 5 and 05 LLY trucks. The sharp corner of the FICM bracket cuts into the wire loom and the wires. The sharp edge of the FICM bracket, cuts into the protective cover and wires- shorts the injection. 00 your LB7 LLY LBZ or LMM Duramax ECM/TCM (Engine to Chassis) harness is reworked to standalone and will look factory fresh. The wiring harness is nylon tied to the wiring harness brace. Unfortunately, I replaced the Ficm, and the #3 injector first and it would do it again. M) module. It is a simple fix to use a piece of heater hose around the harness, or a more elaborate fix like the poster shows. $$ For $576. Oct 20, 2017 · The most common issues are #2/7 harness's and the wire bundle on the alternator. Remanufactured fuel injection control (F. Where can someone purchase a part like you show-?? All LLY owners should check and isolate the FICM harness NOW. May 29, 2013 · You did not mention that you actually checked this common LLY problem. Dec 4, 2016 · I am very familiar with the injector harness issues and running issues as this is my 3rd lly truck. Nov 20, 2017 · General Motors details a chafing problem in the FICM wiring harness (TSB #09-06-04-034) as it passes behind the alternator mounted on the front passenger side of the engine. The sharp corner of the FICM bracket where it is tied down to, cuts into the wires. Jun 29, 2020 · GM sells connectors (VERY expensive) and there are some very cheap ones on Amazon (I've used these and had great success so far). Nov 19, 2024 · 3. Apr 3, 2011 · Are you aware that the FICM harness does short out at the FICM bracket where it is secured with a zip tie-? Sorry, don't have a pin-out diagram. This problem is caused by a poorly designed metal mount for the harness and requires a thorough inspection of the FICM harness where it passes behind the alternator. Feb 4, 2020 · Check FICM wiring harness that is zip tied to alternator bracket inspect inside the loom for rubbing and bare wires. Repair the wires as necessary-- Best to isolate the harness with a short piece of heater hose. So, usually, just the connector(s) need to be replaced, not the entire harness. The harness is tied down with a tie strap. never started again. Also check harness chafes at FICM connector bracket (over left valve cover). It looks like it has fixed it though 👍👍🙏🙏. From there you have to start pulling wires apart and checking them VERY carefully. Dec 14, 2006 · Long story short, FICM has been replaced 4 times, and now GM has to have an inspector verify that the engine harness needs to be replaced. 2004. WARRANTY: PLEASE NOTE, GM has issued a service bulletin on 04-05 LLY trucks beginning in 2008 informing of known wire bundle chaffing. I. Yep, I like the Ol' Beast. So for he last 5 months the truck would randomly either shut off or barely runs and sounds like a tractor. Right now turn around is 2 weeks. inspect carefully. Aug 1, 2011 · This condition may be caused by the fuel injector control module (FICM) wiring harness protective conduit rubbing against the back of the alternator, the alternator bracket or the FICM harness retaining bracket. Aug 17, 2021 · Re-acquiring an LLY FICM(Next to impossible) getting another LLY engine harness since I hacked up mine to go the LB7 route. i messed with wire harness in different places on the engine and it would go into limp mode. This harness is the connection between the ECM/TCM and the engine harness as well as the transmission. 5-2005 Chevy / GMC 2500HD / 3500HD LLY. 5-2005 (LLY) 6. If any part of the taped portion of the harness is touching the FICM wiring harness retaining bracket, then you must look for chaffing on the wiring harness. Oct 15, 2014 · The other problem is the FICM harness-- It is secured at the side of the alternator with a Zip tie. Cut the tie and inspect the wires. THe FICM energizes each fuel injector by grounding the command circuit between the FICM and the fuel injector. Jul 16, 2012 · So glad to find this write up. It is rare that a FICM is bad on a LLY engine, but wires can cause problems--At the passenger side of the alternator-- the FICM wire harness is tied down to the bracket with a zip tie. It may be necessary to remove the nylon tie to inspect the harness. May 8, 2013 · It is very rare for a FICM to go bad on a LLY engine-- shorted wires on the FICM bracket-very common. Another injector harness problem is where it is pulled tight over the alternator bracket near the FICM. xkpaazwpmzyllrbnrpfxwivywpglqfplytoytfuxtlgahgfroashvxfxpusjeehfgpcisuchflxdwcczdn