DOCUMENT REF N°: 1.6.243 August 2000
DEALER QUALITY
BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER
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.
A
F
BROCHURE SUMMARY
BOSCH EDC 15C2 HDI SYSTEM (High pressure Diesel Injection)COMBINED WITH A PARTICLE FILTER SYSTEM
The aim of this brochure is to define the composition and operation of a BOSCH EDC 15 C2 HDI diesel engine management system, combined with a particle filter system, in relation to the DW12 Diesel engine.
This device consists of an ECU which analyses the information from the various sensors, and then operates the injectors at the correct moment. It also controls a pressure regulator, the exhaust gas recycling electrovalve and the turbocharging pressure modulating electrovalve.
The following subjects are dealt with in this document:
- General details and system presentation,
- Description and operation of the components of the various functions, or the functions themselves,
- Description of the operating phases:
· of the injection system,
· of the particle filter system.
- Notes on maintenance,
- The electrical circuit.
CONTENTS
Chapter 1: GENERAL details: hdi direct injection system 1
I - foreword 1
ii - PRINCIPle of hdi 4
III - particle filtration principle 5
IV - safety instructions 6
Chapter 2: general layout: hdi system 9
Chapter 3: fuel supply function 13
I - diagram 13
II - COMPONENTS COMMON WITH DOCUMENT "BOSCH EDC 15C2 HDI INJECTION SYSTEM" 15
III - specific components 15
IV - electric fuel heater (1276) 16
V - low pressure pump supply cut-off 16
Chapter 4: air supply function 17
I - diagram 17
II - COMPONENTS COMMON WITH DOCUMENT "BOSCH EDC 15C2 HDI INJECTION SYSTEM" 20
III - specific components 20
IV - vacuum reserve 21
V - variable geometry turbocharger 22
VI - variable "swirl" 26
VII - swirl control electrovalve (1264) 27
VIII - feature: inlet manifold pressure sensor (1312) 28
Chapter 5: exhaust gas recycling function 29
I - diagram 29
II - COMPONENTS COMMON WITH DOCUMENT "BOSCH EDC 15C2 HDI INJECTION SYSTEM" 32
III - SPECIFIC COMPONENTS 32
IV - water/exhaust gas exchanger (EGR) 32
V - throttle housing (EGR) 32
Vi - throttle housing control electrovalve (EGR) (1263) 33
Chapter 6: hdi system 35
I - COMPONENTS COMMON WITH DOCUMENT "BOSCH EDC 15C2 HDI INJECTION SYSTEM" 35
ii - SPECIFIC COMPONENTS 36
III - DOUBLE INJECTION RELAY (BSM) - feature 36
IV - coolant temperature sensor (1220) - feature 37
V - fuel temperature sensor (1221) - feature 39
VI - BRAKE SWITCH (2100) - feature 40
VII - CRUISE CONTROL brake pedal switch (7308) - feature 40
VIII - clutch switch (7306) - feature 40
IX - vehicle speed sensor - feature 40
X - INJECTION ECU (1320) - feature 41
Chapter 7: pre-post heating function 47
I - COMPONENTS COMMON WITH DOCUMENT "BOSCH EDC 15C2 HDI INJECTION SYSTEM" 47
II - preheater plugs (1160) - feature 47
Chapter 8: engine cooling function (fric) (INcorporated into the INJECTION ECU) 49
I - diagram 50
II - fan unit (1510) 52
III - coolant temperature sensor (1220) 54
IV - POSTVENTILATION 54
V - downgraded mode 54
Chapter 9: cooling requirements for the air conditioning (brac) (incorporated into the INJECTION ECU) 55
I - diagram 56
II - AIR CONDITIONING PRESSURESTAT (8007) 58
III - FAN UNIT (1510) 60
IV - downgraded mode 60
Chapter 10: particle filter function 61
I - diagram 61
...
wrona1977