Electronic Transmission Control Introduction 1-10-03.qxd - GE39

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Adaptive Features (AGS) AGS features were introduced in 1994 with the A5S560Z transmission. AGS control consists of adaptive features that will modify transmission operation according to various factors. AGS operation can be influenced by two major functional groups: • Driver influenced features (influenced by throttle and kickdown input) • Environmental influences (such as road conditions - icy, traffic etc.) The driving program selection is not adapted on a long term basis - nor is it stored in the control module memory when the ignition is switched off. It continually changes as the driver of the vehicle changes driving habits. 38 Electronic Transmission Control
Driver influenced features of AGS The adaptive drive program is based primarily on throttle input. The throttle information comes from the ECM (DME) via the CAN bus. The TCM continuously monitors the throttle input for: • The current throttle position • The rate of change in pedal movement • The number of acceleration requests • The number of kickdown requests Drive away Evaluation The AGS system selects the appropriate shift program based on the amount of acceleration that occurs during takeoff. When driving away under full throttle the transmission will shift from XE to E. Kick Fast Feature Based on these inputs, the AGS will select one three different driving programs as follows: • Extreme Economy - Shift points are a low speeds for maximum comfort and economy • Economy - The shift points are raised for more performance with economy as priority • Sport - The shift points are higher to take advantage of full engine performance. Under full throttle acceleration at high speed, single gear downshifts are possible. A two gear downshift is possible if the accelerator pedal is moved quickly to kick-down. The Extreme Sport program was eliminated as part of the kick-fast feature. 39 Electronic Transmission Control
Page 1 and 2: Table of Contents Electronic Transm
Page 3 and 4: Purpose of the System Electronicall
Page 5 and 6: Transmission Version and Control Sy
Page 7 and 8: Transmission Identification BMW aut
Page 9 and 10: System Components (Electrical) A5S
Page 11 and 12: Turbine Speed Sensor The Turbine Sp
Page 13 and 14: Kickdown Switch The TCM receives a
Page 15 and 16: Transmission Range Selector Switch
Page 17 and 18: Steptronic Components The Steptroni
Page 19 and 20: Pressure Regulating Solenoids Press
Page 21 and 22: Instrument Cluster The cluster is u
Page 23 and 24: Transmission Features and Principle
Page 25 and 26: Emergency Program When a malfunctio
Page 27 and 28: Torque Converter Clutch Since the e
Page 29 and 30: Shift Solenoid Control Magnetic val
Page 31 and 32: Shift Programs BMW EH transmissions
Page 33 and 34: Steptronic Shift Modes The Steptron
Page 35 and 36: Steptronic Shifter Circuit In order
Page 37: Table of Contents Electronic Transm
Page 41 and 42: Hill Recognition Program There are
Page 43 and 44: CAN Bus Topology The CAN bus consis
Page 45 and 46: The voltage of the CAN bus is divid
Page 47 and 48: Establishing a Diagnostic Plan Once
Page 49 and 50: Identification Page The ID page is
Page 51 and 52: Test Modules Test modules are found
Page 53 and 54: Information Resources When diagnosi
Page 55 and 56: Control System Transmission Coding
Page 57 and 58: Transmission Fluid Checking Procedu
Page 59 and 60: Transmission Service Overview of Al
Page 61 and 62: Transmission Adjustments Tool # 24
Page 63 and 64: Tool # 24 6 010 8-pin test cable us
Page 65 and 66: Tool # 24 2 380 34 mm Socket used t
Page 67: 11.List 5 inputs to the TCM from th

Electronic Transmission Control Introduction 1-10-03.qxd - GE39

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