electran1.pdf

Table of Contents

Electronic Transmission Control

Subject

Page

Purpose of the System ........................................................................ 4

Transmission Versions and Control Systems ................................... 6

Transmission Identification ................................................................. 8

System Components ........................................................................... 10

Transmission Control Module ................................................................ 11

Speed Sensing ..................................................................................... 12

Transmission Oil Temp Sensor .............................................................. 13

Kickdown Switch/Circuit ....................................................................... 14

Brake Switch ........................................................................................ 15

Transmission Range Selector Switch .................................................... 16

Transmission Program Switch ............................................................... 17

Steptronic Components ........................................................................ 18

Magnetic Valves .................................................................................... 19

Pressure Regulating Solenoids .............................................................. 20

Mechatronics Module ............................................................................ 21

Instrument Cluster ................................................................................. 22

Transmission Features and Principles of Operation ........................ 24

Adaptive Hydraulic Pressure Control ......................................................24

Downshift Protection.............................................................................. 25

Reverse Lockout ................................................................................... 25

Engine Warm Up Cycle ......................................................................... 25

ASC/DSC Shift Intervention .................................................................. 25

Torque Reduction ................................................................................. 25

Emergency Program ............................................................................. 26

A/C Compressor Load Sensing ............................................................ 27

Shift Lock ............................................................................................. 27

Torque Converter Clutch ....................................................................... 28

Shift Solenoid Control ........................................................................... 30

Pressure Regulation .............................................................................. 31

Shift Programs .......................................................................................32

Steptronic ..............................................................................................34

Initial Print Date: 1/15/03

Revision Date:

Model: All with BMW Automatic Transmission

Production: All

Objectives:

After completion of this module you will be able to:

•

Identify BMW EH Automatic Transmissions.

•

Identify Electronic Transmission Control Components

•

Understand Electronic Transmission Operation

•

Diagnose Transmission related faults using the DISplus or GT-1

•

Understand service items and special tools.

Electronic Transmission Control

Purpose of the System

Electronically controlled transmissions were introduced on BMW products in 1986 on 5 and

7 series vehicles. Currently EH (Electro-hydraulic) transmissions are offered on almost every

production model (Except E46 M3 and E39 M5). EH transmissions offer the following ben-

efits the to driver:

•

Increased driving safety by reducing fatigue. All shifts are automatic as opposed to

manual transmissions which require more driver interaction.

•

Increased fuel economy through use of lock up torque converter.

•

Increased fuel economy through optimized shift points.

•

Improved shift comfort by use of “Overlap Shift” technology (ZF).

•

More available features through the use of CAN bus technology.

Electronic Transmission Control

The EH Control System is designed to work in conjunction with the engine electronics for

precise shift control. The TCM receives information on engine RPM, load and throttle posi-

tion to provide optimum shift points to maximize fuel economy and driver comfort.

The function of an EGS System is to:

•

Monitor all operating conditions through input signals

•

Continually assess operating conditions by processing input data and select the

appropriate operating program for current conditions.

•

Activate transmission system components and to communicate with other drivetrain

control systems.

•

Respond to driver selected driving program (Economy, Sport or Manual).

In addition to providing shift control, the TCM also adapts to changing conditions within the

transmission by monitoring slip ratios and modifying line pressure. This increases the life of

the transmission and reduces maintenance and adjustments. The TCM controls the oper-

ation of the Lock-Up Torque Converter which further increases economy.

On current models, the TCM also has the capability of adapting to driver habits and

responds to changing environmental conditions. Items such as rate of throttle input and

kickdown requests are monitored to select the most appropriate shift program.

The EGS system is also required to maintain occupant safety, safeguard drivetrain damage,

improve vehicle emissions and operate in failsafe mode when a malfunction occurs.

Electronic Transmission Control

Transmission Version and Control Systems

Each BMW Electro-hydraulic transmission has a corresponding control system. They are

designated “GS” which stands for Transmission Control. This acronym is from the German

words G etriebe S teurung. Each transmission can have more than one control system, this

depends upon application (model year, series etc.). Below is a listing of ZF control systems

used on BMW vehicles, Hydramatic control systems are shown on the opposing page.

ZF Control Systems

Transmission

BMW ID #

Manufacturer

Model/Year

Control System Engine

4HP22 (EH)

86 535i

86 635i

86 735i

GS 1.2X

M30

4HP24 (EH)

88-9/91 750iL (E32)

92-94 750iL (E32)

90-94 850i/Ci (E31)

GS 1.27

GS 1.29

M70

A5S310Z

5HP18

93 530i/iT (E34)

94 530i/iT (E34)

95 M3 (E36)

96-99 M3 (E36)

GS 7.3

GS 7.32

GS 7.11

GS 8.32

M60

S50 (US)

S52

A5S325Z

5HP19

00 323i/Ci/CiC (3/00-8/00)

01 323iT (from 4/01)

GS 8.60

M52 TU

01-02 325i/Ci/CiC from 9/00

00-01 330i/Ci/CiC from 6/00

01- 525 from 3/01

01- 530 from 3/01

03 Z4 (E85) 2.5i and 3.0i

GS 8.60.4

M54

A5S440Z

5HP24

97 840Ci (E31) from 9/96

97 540i (E39) 1/97-8/97

97 740i/iL (1/97 - 4/97)

97 740i/iL (5/97-8/97)

GS 8.55 (CAN index 50)

GS 8.55 (CAN index 60)

M62

98-03 540i

98-01 740i/iL

00- X5 4.4i

GS 8.60.2 (CAN index 60)

GS 8.60.2

M62, M62 TU 99-02

M62, M62 TU 99-01

M62TU

A5S560Z

5HP30

93-94 740i/iL (E32)

93 540i (E34)

94-95 540i (E34)

94-95 840Ci (E31)

95 740i/iL (E38)

GS 9.2

GS 9.22

M60

95-01 750iL (E38)

96-97 740i/iL ( -1/97)

96 840Ci (E31)

95-97 850Ci

GS 9.22.1

M73/M73TU

M62

M73

GA6HP26Z

02- 745Li (E65/E66)

03- 760Li (E66)

GS 19

N62

N73

Electronic Transmission Control

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