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TECHNICAL TRAINING

OPERATING PRINCIPLE BOSCH ME7.4.4 / M7.4.4 AND EOBD

DOCUMENT REF N°: 1.3.277 September 2000

DEALER QUALITY DEVELOPMENT DIVISION

1

NOTE TO READERS This document contains information of a confidential nature. It is therefore strictly reserved for the use of CITROËN trainers and may not be distributed to people outside the relevant departments.

ABROCHURE SUMMARY OPERATING PRINCIPLE BOSCH ME7.4.4/M7.4.4 AND EOBD

The aim of this document is to define the composition and operation of the BOSCH ME7.4.4 and M.7.4.4 petrol engine management systems. These devices consist of a digital ECU which analyses information from the various sensors and then operates the injectors and ignition coils at the right moment. It is also responsible foroperating the petrol vapour recycling electrovalve, the gas throttle or idle regulation motor and an air injection to the exhaust pump. The following subjects will be dealt with in this document: General details and presentation of the systems. Description and operation of the components. Wiring diagrams. Diagnostics.

EOBD is dealt with at the end of the document.

OPERATING PRINCIPLE -BOSCH ME7.4.4/M7.4.4 AND EOBD

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CONTENTS
CHAPTER 1: FOREWORD ........................................................................ 1

CHAPTER 2: DESCRIPTION OF THE COMPONENTS ............................ 9
III III IV VVI VII INLET AIR PRESSURE SENSOR............................................................................. 9 ENGINE SPEEDSENSOR...................................................................................... 11 KNOCK SENSOR ................................................................................................... 13 MOTORISED THROTTLE HOUSING (ME7.4.4) ................................................... 14 ACCELERATOR PEDAL POSITION SENSOR (ME7.4.4)...................................... 18 COOLANT TEMPERATURE SENSOR.................................................................. 20 COOLANT TEMPERATURE THERMOCONTACT................................................ 22

VIII - PRESSURESTAT ................................................................................................... 23 IX XXI XII IGNITIONCOIL....................................................................................................... 24 POWER STEERING OIL PRESSURE SWITCH *................................................... 26 FUEL PRESSURE REGULATOR........................................................................... 27 INJECTORS............................................................................................................ 28

XIII - FUEL PUMP........................................................................................................... 28 XIV - FUEL FILTER ......................................................................................................... 29 XIV - DOUBLE MULTIFUNCTION RELAY...................................................................... 30 XVI - CANISTER RESERVOIR....................................................................................... 31 XIX - DOWNSTREAM OXYGEN SENSOR..................................................................... 34 XX - CATALYTIC CONVERTER .................................................................................... 36 XXI - STEPPER MOTOR ( M7.4.4 ) ................................................................................ 37

OPERATING PRINCIPLE - BOSCH ME7.4.4/M7.4.4AND EOBD

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CONTENTS
CHAPTER 3: DIAGNOSTIC ASSISTANCE ............................................. 43
III III IV VVI VII IDENTIFICATION .....................................................................................................43 HISTORY..................................................................................................................44 READ FAULTS...
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