Product Overview
This ATSG GM 6T30/6T40/6T45/6T50 Technical Manual contains the procedures necessary to diagnose, overhaul and/or repair the 6T30/40/45/50 (6 Speed) GEN 1 and GEN 2 transmissions from General Motors and is for use by professional technicians.The Hydra-matic 6T30/40/45/50 (6 Speed) is a fully automatic, six speed, front wheel drive, electronically controlled transmission that features clutch to clutch shifting. It is also all-wheel drive capable. It was first introduced in the 2007 Chevy Captiva followed by the Malibu in 2008 and quickly spread to the compact, mid-size, small crossover vehicle line, as shown in Figure 1. The 6T40 is also found in hybrid applications. At the start of production for the 2012 model year Generation 2 was introduced which is currently used in all platforms using the 6T family of transmissions. This series of transmissions is also known as the GF6.It consists primarily of a four element torque converter, three planetary gear sets, five clutch packs, one mechanical one-way clutch and a hydraulic pressurization and control system. Three planetary gear sets provide the six forward gear ratios and reverse. Changing gear ratios is fully automatic and is accomplished through the use of a Transmission Control Module (TCM), that is located within the transmission. The TCM receives and monitors various electronic sensor inputs, and uses this information to shift the transmission at the optimum time. The TCM commands shift solenoids and Clutch Pressure Control (CPC) solenoids within the transmission to control shift timing. The TCM controls shift feel through the CPC solenoids. The TCM also controls the apply and release of the torque converter clutch which allows the engine to deliver the maximum fuel efficiency without sacrificing vehicle performance. GENERAL DESCRIPTION AND VEHICLE APPLICATION CHART........................ 3COMPONENT LOCATION AND IDENTIFICATION.................................................... 4COMPONENT APPLICATION CHART............................................................................ 5SHIFT QUADRANTS........................................................................................................... 6IDENTIFICATION TAG INFORMATION....................................................................... 8TRANSMISSION FLUID REQUIREMENT, DRAIN, FILL & CHECK PROCEDURES...................................................................................................................... 9TRANSMISSION LINE PRESSURE SPECIFICATIONS............................................ 10ELECTRONIC COMPONENT OPERATION................................................................. 11SOLENOID IDENTIFICATION & APPLICATION CHART....................................... 12SOLENOID DESCRIPTION AND OPERATION........................................................... 13TRANSMISSION FLUID TEMPERATURE SENSOR & PRESSURE SWITCH ID. 20PRESSURE SWITCH & MANUAL SHAFT POSITION SWITCH (IMS) LOGIC CHART................................................................................................................................. 21INPUT & OUTPUT SPEED SENSOR............................................................................. 22AUXILIARY FLUID PUMP ASSEMBLY (BAS HYBRID ONLY)................................ 23CASE CONNECTOR TERMINAL IDENTIFICATION................................................ 24TYPICAL WIRING SCHEMATIC.................................................................................... 25DIAGNOSTIC TROUBLE CODE DESCRIPTIONS..................................................... 26HYDRAULIC PASSAGE IDENTIFICATION................................................................ 29CHECK BALL LOCATION AND FUNCTION............................................................... 37TRANSMISSION DISASSEMBLY................................................................................... 41COMPONENT REBUILD SECTION3-5-REVERSE/4-5-6 CLUTCH HOUSING - DISASSEMBLY..................................... 633-5-REVERSE/4-5-6 CLUTCH HOUSING - ASSEMBLY............................................ 751-2-3-4 & LOW-REVERSE CLUTCH HOUSING - DISASSEMBLY.......................... 851-2-3-4 & LOW-REVERSE CLUTCH HOUSING - ASSEMBLY................................. 86TRANSMISSION FLUID PUMP DISASSEMBLY........................................................ 88TRANSMISSION FLUID PUMP ASSEMBLY ASSEMBLY......................................... 90CONTROL VALVE BODY - DISASSEMBLY.................................................................. 93CONTROL VALVE BODY - ASSEMBLY......................................................................... 96TRANSMISSION FINAL ASSEMBLY.......................................................................... 100TRANSMISSION ELECTRONIC CONTROL HYDRAULIC MODULE OVERHAUL.............................................................................................................................................. 120TRANSMISSION FINAL ASSEMBLY - CONTINUED............................................. 123AIR CHECK LOCATIONS.............................................................................................. 127TORQUE SPECIFICATIONS......................................................................................... 128SPECIAL TOOLS.............................................................................................................. 130
