2009 SUBARU IMPREZA WRX and WRX STI Service and Repair Manual

TECHNICIANS TRAINING AND REFERENCE MATERIALS

Technicians Reference Booklet 4EAT Phase II Module 304

© Copyright 2001 Subaru of America, Inc. All rights reserved. This book may not be reproduced in whole or in part without the express permission of Subaru of America, Inc. Subaru of America, Inc. reserves the right at any time to make changes or modifications to systems, procedures, descriptions, and illustrations contained in this book without necessarily updating this document. Information contained herein is considered current as of April 2001. © Subaru of America, Inc. 2001 TT06002/01

Effective: 4/10/01 4EAT Phase 2 3 Table of Contents Slide Sequence ................................................................................................................... 4 Introduction ........................................................................................................................ 6 Disassembly ....................................................................................................................... 7 Variable Torque Distribution (VTD) ................................................................................... 9 4EAT Phase 2 Disassembly Continued ........................................................................ 13 Servicing the Oil Pump .................................................................................................... 17 Servicing the High and Reverse clutch .......................................................................... 18 Servicing the Planetary Gear Assembly and Low Clutch ............................................. 19 Hydraulic Control ............................................................................................................. 21 Line Pressure ................................................................................................................... 21 Lock up Engagement .................................................................................................... 22 Lock up Release ........................................................................................................... 22 1st gear ......................................................................................................................... 24 2nd Gear ....................................................................................................................... 25 3rd Gear ........................................................................................................................ 26 4th Gear ........................................................................................................................ 27 TCM Control ...................................................................................................................... 29 Normal Shifting ............................................................................................................. 29 Slope Control ................................................................................................................ 29 Control at Low Temperature ......................................................................................... 29 Control During ABS Operation ...................................................................................... 29 Engine Over Speed Prevention Control ........................................................................ 29 Timing Control .................................................................................................................. 30 Low Clutch Timing Control .............................................................................................. 31 Engine Torque Control .................................................................................................. 31 Learning Control ........................................................................................................... 32 Reverse Inhibit Control ................................................................................................. 32 Engine Brake Control .................................................................................................... 33 Self Diagnosis ................................................................................................................... 34 Failsafe Function .......................................................................................................... 35 2002 Impreza 4EAT Phase 2 Enhancements "Chopper Voltage Signal" ..................... 36

Effective: 4/10/01 4 1 Title Slide (4EAT Phase 2) 2 Created By 3 Teaching Aids 4 Title Slide (General Information) 6 5 Left Side (Introduction) 6 6 Right Side 6 7 Bell Housing 6 8 Disassembly 7 9 Extension Housing 7 10 Transfer Clutch 7 11 Reduction Gears 7 12 Hammer and Punch 7 13 Tool Usage 7 14 Gear on Bench 7 15 Tool Usage 8 16 Filter 8 17 Solenoid 8 18 Artwork 8 19 Oil Pan 9 20 Title Slide (Variable Torque Distribution (VTD)) 9 21 Rear View of 4EAT 9 22 Transfer Planetary 9 23 Transfer Area 10 24 Transfer Planetary 10 25 Reduction Drive Shaft 10 26 Power Split 11 27 Transfer Clutch 11 28 Transfer Planetary 11 29 Piston Clutch Side 12 30 Piston Case Side 12 31 Pressure Ports 12 32 Valve Body with Artwork 13 33 Valve Body 13 34 Failsafe 13 35 Seal Pipe Removal 14 36 Oil Pump 14 37 High Clutch 14 38 Hub 14 39 Front Sun Gear 14 40 Leaf Spring 14 41 2-4 Clutches 14 42 High Clutch 15 43 High Clutch Hub and Front Sun Gear 15 44 Leaf Spring 15 45 Planetary 15 46 2-4 Brake Piston 15 47 Tool Usage 16 48 Tool Usage 16 49 2-4 Brake Piston 16 50 Spring Retainer 16 Slide Sequence Slide No. Description Page No.

2009 SUBARU IMPREZA WRX and WRX STI Service and Repair Manual

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