Four-Speed Automatic Transmissions – SSP 851303



Four-Speed Automatic Transmissions - SSP 851303 PDF

Introduction

The four-speed automatic transmission has received many upgrades since it was first introduced in 1990. Changes have been made to the way range shifts are controlled, the method used to mechanically bypass the torque converter, to the internal gear ratios, and to many other systems, all the while maintaining the basic external appearance of the original. These changes resulted in different versions (phases) of the transmission; the first of which is referred to as ‘Phase 0’ (zero).

The four-speed automatic transmission utilizes just one planetary gearset. Combined with three clutches (K1, K2, and K3), two brakes (B1 and B2), and one freewheeling clutch (F), this Ravigneaux gearset produces four forward and one reverse range, plus Manual Low.

The Self-Study Program provides you with information regarding designs and functions.
The Self-Study Program is not a Repair Manual.
For maintenance and repair work, always refer to the current technical literature.

CONTENTS

Overview

  • Introduction, Evolution, Transmission Identification

Mechanicals/Hydraulics

  • Hydraulic Torque Converter, Torque Converter Lockup, Torque Converter Clutch (TCC), Clutches and Brakes, Power Flow: Phase 0 and Phase 1, Phase 2 and Phase 2 ETA

Electronic Controls

  • Component Identification, Transmission Control Module (TCM) J217, Determining the Shift Point, Fuzzy logic

Sensors

  • Throttle Position (TP) Sensors, Transmission Vehicle Speed Sensor (VSS) G38, Vehicle Speed Sensor G68, Transmission Fluid Temperature Sender G93, Engine Speed Sensor G28, Kick Down Switch F8, Motronic Kick Down Strategy, Multi-function Transmission Range (TR) Switch F125, Brake Light Switch E Cold Neutral Control (CNC)

Actuators

  • Solenoid Valves N88 to N94, Clutch and Brake Apply Charts, Solenoid Apply Charts, Cruise Control System, Shift Lock Solenoid N110, Park/Neutral Position (PNP) Relay J226, Selector Lever Display

Function Diagram

On-Board Diagnosis

  • VAS 5051/5052, Function 04, Basic Settings Display Group 0, Function 08, Reading Measured Value Blocks

Language: English
Format: PDF
Pages: 72
Size: 3.5 Mb
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