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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
Thanks Ron, Thanks Cougar281. I saved the Fuel Injector Programming instructions and when I eventually find the cure for ECM Failure to Communicate, I will check both ECM and GPCM modules for Injector IQA Number, per those instructions. As I have not replaced the GPCM, hopefully it still... -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
After digesting the wiring drawings, it dawned on me I was chasing a red herring. The relevant drawings from gmupfitters 2008_LD_ElectricalPickupsChassisCabs, Section D page number and drawing sheet number: D-343 Power Distribution drawing 12 of 26 PTR = Power Train Relay is activated by the ECM... -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
Thanks mopar3, that is an excellent idea and I will give it a try next. I was stymied when trying to find wiring on the circuits feeding the ECM fuses, which there are several. Ron Nelson provided the link to gmupfitters 2009 electrical document: 2009_LD_ElectricalPickupsChassisCabs_100813... -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
Thanks Cougar281. I bought the replacement ECM from this outfit: FlagshipOne https://www.fs1inc.com/ and they advertise that given the VIN, it should be programed to work out of the box. Which it did, sort of. I still had the intermittent no-crank problem but when the truck did start, it... -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
That list of codes was what appeared immediately after installing the replacement ECU, which was sold as a "stock program" with my VIN the only customization. After the truck started (not the first, second, or third try), I let it warm up for a long while just siting in the driveway, but did not... -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
Thanks Dean, I will put that on the list of things to inspect. I am still looking for the pin to pin diagram of wiring that feeds the multiple ECM fuses as recent testing at the fuses show low and sometime no voltage feed the 25A circuit to the ECM. Fault code 0100, Lost Communication With... -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
Attached are the faults after installing the replacement ECU, Feb 14th. That ECU was initially starting intermittently, the next weekend it fired up like normal (almost) and I tried to take it for a test ride, it died about 5 miles from home. -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
Attached are the codes detected when the first ECM failed, before the truck was towed to the dealer. I did not clear them so they had something to start with. -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
These are the other two fuses I was focused on: -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
Fuse 56 appears to feed several components, Fuel Pump Relay and FSCM were still connected during my voltage testing today. -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
Ron, thanks for the latest info, it was all good. I expected to be chasing GMLAN wiring, and I may yet need to before all is said and done, but I found ECM, fuse #14 - DSL ECM (25A) does not receive 12volts with any position of the Ignition Switch, initially, about 0.1vdc. Fuse #13, ECM-BATT... -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
Thanks Ron. The gmupfitter doc is a gold mine of good info. I found the X1 and X2 ECM connector/Pins descriptions so I can start measuring voltages at the ECM, with the idea that perhaps the ECM is loosing power may be the reason it it not talking on the GMLAN. Found several of Ground Points on... -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
Thanks Dozerboy, I will reach out to Josh. -
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Howdy Yall, looking for recommendations for LMM ECM expertise in the Weatherford Tx/Fort Worth area.
I am a newby to the forum, proud owner a 2009 GMC LMM for the last 11 years. I do oil changes, fuel filter servicing, glow plug replacement, two batteries and the truck was reliable until now. Now at 125K miles, having no-crank starting failure. With key held solid to start, the starter would...