Gm Service Manual Pdf Silverado 5.3 - 5.3L Crate Engine Control System - Chevrolet
Service Bulletin INFORMATION Bulletin No.: 20-NA-038 Date: March, 2020 Subject: Information on Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) Usage This bulletin replaces PIP5663. Please discard PIP5663. Brand: Cadillac Model: CTS CT6 Escalade 3500/4500 Medium Duty (LCF) Camaro Corvette Express Silverado Model Year: from to 2016 2019 2016 2020 2015 2020 2020 2016 2014 2020 2018 2014 2020 2020 2019 2020 2020 2018 Chevrolet Silverado 1500 (New Model) Silverado LD Silverado 1500 Silverado 2500/3500 Suburban 2019 2019 2020 2020 2015 Tahoe Savana 2015 2018 GMC Sierra 2014 Sierra 1500 (New Model) 2019 Copyright 2020 General Motors LLC. All Rights Reserved. 2019 2019 2020 2020 2020 2020 2020 2018 2019 VIN: from to Engine: Transmission: 6.2 (LT4) 6.2 (LTA) 5.3 (L83) 6.2 (L86) 6.6 (L8T) 6.2 (LT1, LT4) 6.2 (LT1, LT4, LT5) 6.2 (LT2) 4.3 (LV1) 4.3 (LV1, LV3) 5.3 (L83) 6.2 (L86) 4.3 (LV3) 5.3 (L82, L84) 6.2 (L87) 5.3 (L83) 4.3 (LV3) 5.3 (L82, L84) 6.2 (L87) 6.6 (L8T) 5.3 (L83) 6.2 (L86) 5.3 (L83) 6.2 (L86) 4.3 (LV1) 4.3 (LV1, LV3) 5.3 (L83) 6.2 (L86) 4.3 (LV3) Page 2 Brand: Model: March, 2020 Model Year: from to VIN: from to Sierra Limited Sierra 1500 Sierra 2500/3500 Yukon Models 2019 2020 2020 2015 2019 2020 2020 2020 Bulletin No.: 20-NA-038 Engine: Transmission: 5.3 (L82, L84) 6.2 (L87) 4.3 (LV3) 5.3 (L83) 6.2 (L86) 4.3 (LV3) 5.3 (L82, L84) 6.2 (L87) 6.6 (L8T) 5.3 (L83) 6.2 (L86) Involved Region or Country Information North America, Europe, Uzbekistan, Russia, Middle East, Iraq, Israel, Palestine, Argentina, Brazil, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru, Uruguay, Venezuela, Japan, Cadillac Korea (South Korea), GM Korea Company, China, Taiwan, Thailand, Singapore, Philippines, Egypt, Other Africa, South Africa AFM (Active Fuel Management) To provide maximum fuel economy under light load driving conditions, the engine control module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders 1, 7, 6, and 4, switching to a V4 mode. The engine will operate on 8 cylinders, or V8 mode, during engine starting, engine idling, and medium to heavy throttle applications. AFM active fuel management strategy which deactivates the lifters on specific cylinders. On V8 engines, it deactivates half of the cylinders (1,7,6 and 4) and on V6 engines, it deactivates only 2 of the cylinders (3 and 6). For LTA and LT2 engines, the deactivation occurs on cylinders 2, 3, 5 and 8. LOMA lifter oil manifold assembly is only used on legacy AFM applications DFM (Dynamic Fuel Management) Dynamic Fuel Management (DFM) is recognized as active fuel management technology with the additional ability to deactivate any combination of cylinder valves for an internal combustion engine. This technology combines millisecond-accurate torque control with cylinder deactivation to optimize fuel consumption of spark ignited engines. The control of every cylinder event optimizes engine operation such that peak efficiency is obtained throughout the range of engine operation. DFM extends cylinder deactivation to all cylinders, which allows for a large variety of firing sequences. DFM can have rotating cylinder deactivation patterns as well as fixed patterns. For rotating patterns, which cylinders are being deactivated can change with each subsequent engine cycle. Transitions between firing sequences is done in a continuous fashion, making the transitions seamless and transparent to the vehicle operator. DFM dynamic fuel management which can deactivate the lifter on any cylinder at any time. Unlike AFM, this can result any many different types of firing patterns, some of which are fixed patterns (like ¼, ½, ¾) and others which are rotating (like 1/5, 1/3, 2/5, 2/3). This is only available on small block engines (L84 and L87). OCV oil controlled valve is only used on small block engines. These provide faster response times than LOMA and are required for DFM (on L84 and L87). OCVs are also used on L82 for AFM. Refer to the AFM/DFM Usage Chart below. Bulletin No.: 20-NA-038 AFM/DFM Usage Chart Vehicles CTS LT4 CT6 LTA AFM VLOM Yes No Camaro LT1 Yes Camaro LT4 Yes Corvette LT1 Yes Corvette LT2 No Corvette LT4 Yes Corvette LT5 No Escalade L83, L86 Yes Express/Savana LV1 No Silverado/Sierra L83, L86 Yes Suburban/Tahoe/Yukon L83, L86 Yes Silverado/Sierra L82 No Silverado/Sierra L84 No Silverado/Sierra L87 No Silverado/Sierra HD L8T No Silverado/Sierra LV1 No Silverado/Sierra LV3 Yes 3500/4500 Medium Duty (LCF) No Parts Information No parts are required for this repair. March, 2020 4 Cylinder Deactivation Yes Yes Yes No Yes Yes Yes No Yes No Yes Yes Yes No No No No Yes No DFM. OCV's No No No No No No No No No No No No Yes Yes Yes No No No No Version Modified 1 Released February 26, 2020 Page 3 FDFM No No No No No No No No No No No No No Yes Yes No No No No None Notes Always active Automatic only. AFM not active with Manual trans Has the hardware, Not active Auto Trans active, Manual Trans active in ECO only Auto Trans active, Manual Trans active in ECO only Yes No hardware on LT5 No hardware on LV1 No hardware on L8T No hardware on L8T GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATIONArbortext Advanced Print Publisher 9.1.550/W Unicode Arbortext Advanced Print Publisher 9.1.550/W Unicode