CITROËN
TECHNICAL
TRAINING
PRESENTATION OF THE AL4
AUTOMATIC TRANSMISSION
_________________
CITROËN UK LTD
221 BATH ROAD
SLOUGH SL1 4BA
DEALER PERSONNEL
DEVELOPMENT AND
TRAINING
_________________
© CITROËN UK LTD. Reproduction whether partial or in full without
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A
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 dealt with 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
CHAPTER 1 : PRESENTATION - GENERAL............................. PAGE 1 I - INTRODUCTION.............................................................................. PAGE 1 II - PRESENTATION ............................................................................. PAGE 2 III - DESCRIPTION OF THE AL4 AUTOMATIC TRANSMISSION .......... PAGE 3 IV - IDENTIFYING THE COMPONENTS OF THE AUTOMATIC TRANSMISSION.............................................................................. PAGE 5 V - SPECIFICATIONS - SERVICING..................................................... PAGE 7 VI - LAYOUT OF THE AL4 AUTOMATIC TRANSMISSION .................... PAGE 8 VII - MISCELLANEOUS ADVICE............................................................. PAGE 9 CHAPTER 2 : SELECTOR CONTROL........................................ PAGE 11 I - SELECTOR LEVER ......................................................................... PAGE 11 II - PROGRAM SELECTOR................................................................... PAGE 13 CHAPTER 3 : CHECKING THE OIL LEVEL............................... PAGE 15 CHAPTER 4 : THE TORQUE CONVERTER............................... PAGE 17 I - DESCRIPTION................................................................................. PAGE 17 II - CONVERTER LOCK-UP.................................................................. PAGE 18 CHAPTER 5 : THE EPICYCLIC GEAR TRAIN ........................... PAGE 21 I - DESCRIPTION................................................................................. PAGE 21 II - OPERATING PRINCIPLE ................................................................ PAGE 23 CHAPTER 6 : ECU....................................................................... PAGE 27 I - ECU FUNCTIONS............................................................................ PAGE 27 II - OPERATING SUMMARY................................................................. PAGE 31 III - ECU CONNECTIONS ...................................................................... PAGE 33 CHAPTER 7 : AUTO-DIAGNOSTIC ............................................ PAGE 35 I - FAULT WARNINGS......................................................................... PAGE 35 II - MEMORISED FAULTS / DOWNGRADED MODES.......................... PAGE 36
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CHAPTER 1 : PRESENTATION - GENERAL............................. PAGE 1 I - INTRODUCTION.............................................................................. PAGE 1 II - PRESENTATION ............................................................................. PAGE 2 III - DESCRIPTION OF THE AL4 AUTOMATIC TRANSMISSION .......... PAGE 3 IV - IDENTIFYING THE COMPONENTS OF THE AUTOMATIC TRANSMISSION.............................................................................. PAGE 5 V - SPECIFICATIONS - SERVICING..................................................... PAGE 7 VI - LAYOUT OF THE AL4 AUTOMATIC TRANSMISSION .................... PAGE 8 VII - MISCELLANEOUS ADVICE............................................................. PAGE 9 CHAPTER 2 : SELECTOR CONTROL........................................ PAGE 11 I - SELECTOR LEVER ......................................................................... PAGE 11 II - PROGRAM SELECTOR................................................................... PAGE 13 CHAPTER 3 : CHECKING THE OIL LEVEL............................... PAGE 15 CHAPTER 4 : THE TORQUE CONVERTER............................... PAGE 17 I - DESCRIPTION................................................................................. PAGE 17 II - CONVERTER LOCK-UP.................................................................. PAGE 18 CHAPTER 5 : THE EPICYCLIC GEAR TRAIN ........................... PAGE 21 I - DESCRIPTION................................................................................. PAGE 21 II - OPERATING PRINCIPLE ................................................................ PAGE 23 CHAPTER 6 : ECU....................................................................... PAGE 27 I - ECU FUNCTIONS............................................................................ PAGE 27 II - OPERATING SUMMARY................................................................. PAGE 31 III - ECU CONNECTIONS ...................................................................... PAGE 33 CHAPTER 7 : AUTO-DIAGNOSTIC ............................................ PAGE 35 I - FAULT WARNINGS......................................................................... PAGE 35 II - MEMORISED FAULTS / DOWNGRADED MODES.......................... PAGE 36
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