Tecnico

CITROËN

TECHNICAL TRAINING

PRESENTATION OF THE AL4 AUTOMATIC TRANSMISSION

CITROËN UK LTD
221 BATH ROAD SLOUGH SL1 4BA

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DEALER PERSONNEL DEVELOPMENT AND TRAINING

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© CITROËN UK LTD. Reproduction whether partial or in full without written permission from Citroën UK Ltd is forbidden

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DOCUMENT SUMMARY PRESENTATION OF THE AL4 AUTOMATIC TRANSMISSION

The aim of this document is to give a brief description of the design and operation of the electronically managed AL4 automatic transmission which offers precise, adaptive control as well as excellent gear changing quality. The following subjects are dealtwith in this document: - Presentation of the transmission and various pieces of information, - The selector control, - Lubrication, - The converter, - The mechanism, - The ECU, - Auto-diagnostics, - The electrical circuit, - Unit maintenance.

AL4 AUTOMATIC TRANSMISSION
© AUTOMOBILES CITROËN Toute reproduction ou traduction même partielle sans l'autorisation écrite d'AUTOMOBILES CITROËN estinterdite et constitue une contrefaçon

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CONTENTS
CHAPTER 1 : PRESENTATION - GENERAL .............................
III III IV VVI INTRODUCTION.............................................................................. PRESENTATION ............................................................................. DESCRIPTION OF THEAL4 AUTOMATIC TRANSMISSION .......... IDENTIFYING THE COMPONENTS OF THE AUTOMATIC TRANSMISSION.............................................................................. SPECIFICATIONS - SERVICING ..................................................... LAYOUT OF THE AL4 AUTOMATIC TRANSMISSION .................... PAGE 1 PAGE 1 PAGE 2 PAGE 3 PAGE 5 PAGE 7 PAGE 8 PAGE 9 PAGE 11 PAGE 11 PAGE 13PAGE 15 PAGE 17 PAGE 17 PAGE 18 PAGE 21 PAGE 21 PAGE 23 PAGE 27 PAGE 27 PAGE 31 PAGE 33 PAGE 35 PAGE 35 PAGE 36

VII - MISCELLANEOUS ADVICE.............................................................

CHAPTER 2 : SELECTOR CONTROL........................................
III SELECTOR LEVER ......................................................................... PROGRAMSELECTOR...................................................................

CHAPTER 3 : CHECKING THE OIL LEVEL ............................... CHAPTER 4 : THE TORQUE CONVERTER...............................
III DESCRIPTION................................................................................. CONVERTER LOCK-UP ..................................................................

CHAPTER 5 : THE EPICYCLICGEAR TRAIN ...........................
III DESCRIPTION................................................................................. OPERATING PRINCIPLE ................................................................

CHAPTER 6 : ECU.......................................................................
III III ECUFUNCTIONS............................................................................ OPERATING SUMMARY ................................................................. ECU CONNECTIONS ......................................................................

CHAPTER 7 : AUTO-DIAGNOSTIC ............................................
III FAULT WARNINGS ......................................................................... MEMORISED FAULTS / DOWNGRADEDMODES..........................

AL4 AUTOMATIC TRANSMISSION
© AUTOMOBILES CITROËN Toute reproduction ou traduction même partielle sans l'autorisation écrite d'AUTOMOBILES CITROËN est interdite et constitue une contrefaçon

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CONTENTS
CHAPTER 8 : WIRING DIAGRAM - XANTIA..............................
PETROL ENGINE/WITHOUT CRUISE CONTROL...