Item ⅠOverall Cognition of Electronic Control System for Gasoline Engine001
Ⅰ. Introduction of Item Scene001
Ⅱ. Item Related Knowledge001
（Ⅰ）Overview001
（Ⅱ）Composition and function of engine electronic control unit （ECU）010
（Ⅲ）Test of onboard diagnostics system of engine electronic control system015
ⅢItem Implementation016
（Ⅰ）Requirements for implementation016
（Ⅱ）Implementation steps016
（Ⅲ）Matters needing attention018
Summary019
Exercises and Thinking019
Item ⅡMaintenance of Electronic Control Fuel Injection System for Gasoline Engines020
Ⅰ. Introduction of Item Scene020
Ⅱ. Item Related Knowledge020
（Ⅰ）Classification of fuel injection system020
（Ⅱ）Composition of fuel injection system023
（Ⅲ）Structural principle of sensor for engine fuel injection system026
（Ⅳ）Structural Principle of Actuator for Engine Fuel Injection System050
（V）Engine fuel cutoff control process057
（Ⅵ）Control process of engine fuel injection059
（Ⅶ）Control of fuel injection pulse width063
ⅢItem Implementation068
（Ⅰ）Requirements for implementation068
（Ⅱ）Implementation steps068
（Ⅲ）Notice080
Ⅳ. Knowledge and Skills Expansion080
（Ⅰ）Fuel pump control circuit controlled by ECU080
（Ⅱ）Fuel pump control circuit controlled by fuel pump switch081
（Ⅲ）Fuel pump control circuit controlled by fuel pump relay081
Summary082
Exercises and Thinking083
Item ⅢMaintenance of Electronic Control Ignition System for Gasoline Engine084
Ⅰ. Introduction of Item Scene084
Ⅱ. Item Related Knowledge084
（Ⅰ）Function of ignition system of gasoline engine084
（Ⅱ）Classification of gasoline engine ignition system085
（Ⅲ）Basic requirements for ignition systems085
（Ⅳ）Structure of MCI087
（Ⅴ）Control Process of MCI092
（Ⅵ）High voltage distribution mode of MCI098
（Ⅶ）Detonation control103
Ⅲ. Item Implementation105
（Ⅰ）Requirements for implementation105
（Ⅱ）Implementation steps105
（Ⅲ）Matters needing attention109
Ⅳ. Knowledge and Skills Expansion109
（Ⅰ）Waveform analysis of ignition system109
（Ⅱ）Failure cases114
Summary115
Exercises and Thinking115
Item ⅣMaintenance of Idle Speed Control System for Gasoline Engine116
Ⅰ. Introduction of Item Scene116
Ⅱ. Item Related Knowledge116
（Ⅰ）Classification of idle speed control valves116
（Ⅱ）Principle of ISCV116
（Ⅲ）Process of engine idle speed control121
Ⅲ. Item Implementation125
（Ⅰ）Requirements for implementation125
（Ⅱ）Implementation steps125
（Ⅲ）Matters needing attention130
Ⅳ. Knowledge and Skills Expansion131
（Ⅰ）Electronic throttle idle control actuator131
（Ⅱ）Basic setting of direct type throttle valve131
Summary133
Exercises and Thinking133
Item VMaintenance of Auxiliary Control System of Gasoline Engine134
Ⅰ. Introduction of Item Scene134
Ⅱ. Item Related Knowledge134
（Ⅰ）Environmental Impact of Motor Vehicle Emissions134
（Ⅱ）Classification of emission control system135
（Ⅲ）Principles of Various Emission Control Systems135
Ⅲ. Item Implementation155
（Ⅰ）Requirements for implementation155
（Ⅱ）Implementation steps155
（Ⅲ）Matters needing attention165
ⅣKnowledge and Skills Expansion165
（Ⅰ）Variable port timing and valve lift electronic control system165
（Ⅱ）Working principle of VTEC system166
Summary168
Exercises and Thinking168
Item ⅥTypical Troubleshooting of Electronic Control System of Gasoline Engine169
Ⅰ. Introduction of Item Scene169
Ⅱ. Item Related Knowledge169
（Ⅰ）Fault diagnosis principle of EEC System169
（Ⅱ）Basic methods for fault diagnosis of electronic control systems170
（Ⅲ）Process of fault diagnosis for EEC system172
（Ⅳ）Troubleshooting procedures for fault diagnosis of EEC system174
（Ⅴ）Troubleshooting procedure for common fault diagnosis of electronic control engines178
Ⅲ. Item Implementation180
（Ⅰ）Requirements for Implementation180
（Ⅱ）Implementation steps180
（Ⅲ）Matters needing attention182
Ⅳ. Knowledge and Skills Expansion183
（Ⅰ）Difficult in starting183
（Ⅱ）Too high idle speed184
（Ⅲ）The mixture is too thin184
（Ⅳ）Too rich mixture184
（Ⅴ）Starting stall184
Summary189
Exercises and Thinking189
“Fault Diagnosis and Repair of Automobile Engine Electronic Control System” is the core professional course of Automobile Inspection and Maintenance Technology Specialty in higher vocational colleges， which mainly introduces the structure principle and overhaul of modern automobile electronic control engine system.Students studying this course can lay a good foundation for internships and jobs in this industry.
In the process of compiling this book， editors， taking the structure of Volkswagen automobile as the main body， combined with the actual automobile and diagnostic equipment， detailed introduces the modern automobile engine electronic control system structure， working principle and overhaul through six items， as well as the influence of the electronic control engine sensors， actuators on the operation of the electronic control system.In the implementation of items， students can improve their ability of thinking by studying the practice and matters needing attention.In order to enable readers to master the content of the book in a short time， check their learning effect in time， consolidate and deepen their understanding of what they have learned， each item is followed by exercises and questions.
The editors of this book are from the front line， with rich teaching experience and solid professional theoretical knowledge and practical skills.In the process of writing this book， the typical work items are used as teaching materials to clarify the teaching and learning ideas for teachers and students respectively.At the same time， the training of students’ practical ability is highlighted to meet the training requirements of vocational education.
This book is edited by Xinyu Liu of Tianjin Transportation technical college，deputy by Xianghong Cao，Jiaze Li，and coedited by Ruijing Zhang，of which Zhang Ruijing of Tianjin transportation vocational college compiles project 1， Liu Xinyu of Tianjin transportation vocational college compiles project 2， Cao Xianghong of Tianjin transportation vocational college compiles project 3， project 4 and project 5， and Li Jiaze of Tianjin transportation vocational college compiles project 6.
Due to my limited knowledge， it is inevitable that there is something improper in the book.I sincerely hope that the readers shall correct it.
Editor
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