項目一汽油發動機電控繫統整體認知001
一、項目情境引入001
二、項目相關知識001
（一）概述001
（二）發動機ECU的組成及功能007
（三）發動機電控繫統故障自診斷繫統測試011
三、項目實施012
（一）實施要求012
（二）實施步驟012
（三）注意事項013
小結014
習題及思考014

項目二汽油發動機電控燃油噴射繫統檢修015
一、項目情境引入015
二、項目相關知識015
（一）燃油噴射繫統的分類015
（二）燃油噴射繫統的組成017
（三）發動機燃油噴射繫統傳感器的結構原理019
（四）發動機燃油噴射繫統執行器的結構原理037
（五）發動機斷油控制過程042
（六）發動機燃油噴射的控制過程044
（七）噴油脈衝寬度的控制047
三、項目實施050
（一）實施要求050
（二）實施步驟050
（三）注意事項059
四、知識與技能拓展059
（一）ECU控制的燃油泵控制電路059
（二）燃油泵開關控制的燃油泵控制電路060
（三）燃油泵繼電器控制的燃油泵控制電路060
小結061
習題及思考061

項目三汽油發動機電控點火繫統檢修062
一、項目情境引入062
二、項目相關知識062
（一）汽油機點火繫統的作用062
（二）汽油機點火繫統分類062
（三）對點火繫統的基本要求063
（四）微機控制點火繫統的結構組成064
（五）微機控制點火繫統的控制過程068
（六）微機控制點火繫統高壓電的分配方式072
（七）爆震控制076
三、項目實施078
（一）實施要求078
（二）實施步驟078
（三）注意事項080
四、知識與技能拓展081
（一）點火繫統波形分析081
（二）故障案例084
小結085
習題及思考085

項目四汽油發動機怠速控制繫統檢修086
一、項目情境引入086
二、項目相關知識086
（一）怠速控制閥的分類086
（二）怠速控制閥的原理087
（三）發動機怠速控制過程090
三、項目實施093
（一）實施要求093
（二）實施步驟093
（三）注意事項097
四、知識與技能拓展098
（一）電子節氣門怠速控制執行機構098
（二）直動式節氣門的基本設定099
小結099
習題及思考100

項目五汽油發動機輔助控制繫統檢修101
一、項目情境引入101
二、項目相關知識101
（一）汽車排放對環境影響101
（二）排放控制繫統的分類101
（三）各種排放控制繫統的原理102
三、項目實施117
（一）實施的要求117
（二）實施步驟117
（三）注意事項125
四、知識與技能拓展125
（一）可變配氣相位與氣門升程電子控制繫統125
（二）VTEC繫統工作原理126
小結127
習題及思考127

項目六汽油發動機電控繫統典型故障檢修128
一、項目情境引入128
二、項目相關知識128
（一）發動機電子控制繫統故障診斷原則128
（二）電子控制繫統的故障診斷的基本方法129
（三）電子控制繫統的故障診斷的流程130
（四）電子控制繫統的故障診斷的排除程序133
（五）電控發動機常見故障診斷的排除程序135
三、項目實施137
（一）實施要求137
（二）實施步驟137
（三）注意事項139
四、知識與技能拓展139
（一）啟動困難139
（二）怠速過高140
（三）混合氣過稀140
（四）混合氣過濃140
（五）啟動失速140
小結145
習題及思考145

參考文獻146

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 onboard diagnostics system of engine electronic control system015
ⅢItem 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 cutoff control process057
（Ⅵ）Control process of engine fuel injection059
（Ⅶ）Control of fuel injection pulse width063
ⅢItem 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
ⅣKnowledge 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

“汽車發動機電控繫統故障診斷與修復”課程是高職院校汽車檢測與維修技術專業的一門核心專業課程，主要介紹汽車電控發動機繫統的結構原理及檢修內容。學生學習該課程能夠為進入該行業頂崗實習以及工作奠定一個很好的基礎。
在本書的編寫過程中，編者始終貫徹以大眾轎車構造為主體，結合實際車輛和診斷設備，通過六個項目對現代轎車發動機電控繫統的結構、工作原理及檢修內容進行詳細介紹，同時對電控發動機上的傳感器、執行器對電控繫統工作的影響也做了詳細說明。在項目實施內容中，通過對實操及注意事項的學習達到提高學生思考能力的目的。為了讓讀者能夠在較短的時間內掌握本書的內容，及時檢查自己的學習效果，鞏固和加深對所學知識的理解，每個項目後還附有習題及思考題。
本書編者都來自教學線，有著豐富的教學經驗和扎實的專業理論知識及專業實踐技能。在本書的編寫過程中，以典型工作項目來進行教材的編寫，為教師與學生分別理清了教學與學習的思路，同時突出了對學生實際操作能力的培養，滿足了職業教育學生的人纔培養要求。
本書由天津交通職業學院劉新宇主編，曹向紅、李嘉澤副主編，張瑞靜參編。其中，天津交通職業學院張瑞靜編寫項目一，天津交通職業學院劉新宇編寫項目二，天津交通職業學院曹向紅編寫項目三、項目四、項目五，天津交通職業學院李嘉澤編寫項目六。
由於編者水平有限，書中存在不妥之處在所難免，衷心希望廣大讀者批評指正。

編者

“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 coedited 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