Subaru Automatic Transmissions (4EAT) Module 302 – Technicians Reference Booklet

Subaru Automatic Transmissions (4EAT) Module 302 – Technicians Reference Booklet PDF free online. This Technicians Reference Booklet introduces the first generation of Subaru Four Speed Electronic Automatic Transmissions. It covers the components and their operation, its self-diagnostic system, troubleshooting, transmission removal, inspection, reassembly, and reinstallation procedures. The differences between the front-wheel-drive (FWD) and the four-wheel-drive (4WD) transmissions are also illustrated.

This booklet is designed to support the 4EAT Transmission Core Course and in no way should it be used to replace the service manual. The text and illustrations are derived from classroom instruction and
lab participation.

Ample room has been left throughout the booklet for note taking. It is recommended that after completing the course, this booklet should be filed in your personal Technicians Training Reference Booklets Binder, which is sold through Subaru of America Parts department (MSA5T0100B).

ALWAYS refer to the appropriate model year Subaru Service Manual and applicable service bulletins for all specifications and detailed service procedures. For your convenience, a service bulletin and Service Help Line Update index pages have been added to the back of this booklet.


  • Introduction
  • General Overview
  • Features
  • Major Components
  • Lock-Up Torque Converter
  • Lock Up Operating Modes
  • Oil Pump Assembly
  • Oil Pump Operation
  • Transmission Gear Train
  • Operating Principles: Rear Gear Set
  • High Clutch and Reverse Clutch
  • Operating Principles: Front Gear Set
  • Band Servo Operation
  • Operating Principles: AWD
  • Transfer Clutch Assembly (AWD)
  • AWD component details
  • Final Drive
  • Oil Pump Housing Features
  • Differential Carrier Features
  • Hydraulic Control System
  • Valve Body
  • Accumulators
  • Accumulator Operation
  • Component Disassembly / Inspection
  • Drive Pinion
  • Reassembly
  • Clutch Reassembly Precautions
  • Differential Pinion Backlash
  • Transfer Clutch Valve Assembly
  • Transmission Reassembly
  • Torque Converter Case
  • Final Drive Pre-load & Backlash
  • Forward Clutch Installation
  • Reverse Clutch Drum End-Play
  • Total End-Play
  • Valve Body Precautions
  • Extension Case
  • Transmission Reinstallation
  • Electronic Control System
  • Overview
  • Transmission Control Unit
  • TCU Inputs
  • Legacy TCU Inputs
  • Maintenance Precautions
  • TCU Outputs
  • Shift Modes
  • Combination Meter Light Operation XT – 6 and L – Series
  • Late Model Combination Meter
  • Legacy, SVX, Impreza & Forester Lighting
  • Fail Safe System
  • Fail Safe Components and Failure Results
  • Self Diagnostic System
  • XT and L-Series Diagnostics
  • 1990 –1994 Legacy, 1992 – 1995 SVX, 1993 – 1995 Impreza Diagnostics
  • Select Monitor Analysis
  • 1995 – 1998 Legacy, 1996 – 1998 Impreza, 1996 – 1997 SVX, 1998 Forester, Diagnostics / OBD – II Vehicles
  • Trouble Codes
  • OBD – II
  • OBD – II Operation Overview
  • OBD – II purpose
  • Control Unit Networking
  • Troubleshooting and Adjustments
  • Preliminary Inspection
  • Gearshift Cable Adjustment
  • Stall Test
  • Stall Test Results
  • Time Lag Test
  • Time Lag Results:
  • Pressure Test
  • On Car Service/Adjustments
  • 302 Module Lesson Plan Bulletins
  • 302 Module Service Help-Line Updates
  • 4EAT Valve Body Bolts

Language: English
Format: PDF
Pages: 37

Subaru Automatic Transmissions (4EAT) Module 302 – Technicians Reference Booklet PDF free online

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