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

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Lock-Up Torque Converter Impeller Torque Clutch Converter Torque Converter Clutch Piston Stator Torque Converter Shell One Way Clutch Turbine Shaft SPlines Turbine 29 Electronic Transmission Control
Shift Solenoid Control Magnetic valves are used to direct the flow of transmission fluid to control shift elements in the transmission. Another Term for “Magnetic Valve” is “Shift Valve”. Magnetic valves (MV) are solenoids controlled by the TCM. They can be switched by B+ or B-. On ZF transmissions, magnetic valves are designated MV1, MV2, MV3 etc. On GM transmissions they are designated Shift Valve A, Shift Valve B, Shift Valve C etc. Either valve can be checked for proper resistance using a multi-meter, DISplus or GT-1. Also, the “Activate Components” function can be used to check the Magnetic valves. Most all magnetic valves are switched on/off instead of Pulse Width Modulation (PWM). All magnetic valves (except THM R-1 to 12/95) are supplied power from an internal relay located in the TCM. The magnetic valves are switched on and off by final stage transistors in the TCM. During failsafe operation, power to all MV’s is switched off by the internal relay. Magnetic valves are located on the valve body. They can be replaced individually. Refer to proper repair instructions for installation and removal procedures. TCM Internal Relay Magnetic Valve (Shift Valve) 30 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: Torque Converter Clutch Since the e
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 and 38: Table of Contents Electronic Transm
Page 39 and 40: Driver influenced features of AGS T
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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