汽车发动机电控系统故障诊断与修复课程是高职院校汽车检测与维修技术专业的一门核心专业课程，主要介绍汽车电控发动机系统的结构原理及检修内容。学生学习该课程能够为进入该行业顶岗实习以及工作奠定一个很好的基础。
在本书的编写过程中，编者始终贯彻以大众轿车构造为主体，结合实际车辆和诊断设备，通过六个项目对现代轿车发动机电控系统的结构、工作原理及检修内容进行详细介绍，同时对电控发动机上的传感器、执行器对电控系统工作的影响也做了详细说明。在项目实施内容中，通过对实操及注意事项的学习达到提高学生思考能力的目的。为了让读者能够在较短的时间内掌握本书的内容，及时检查自己的学习效果，巩固和加深对所学知识的理解，每个项目后还附有习题及思考题。
本书编者都来自教学线，有着丰富的教学经验和扎实的专业理论知识及专业实践技能。在本书的编写过程中，以典型工作项目来进行教材的编写，为教师与学生分别理清了教学与学习的思路，同时突出了对学生实际操作能力的培养，满足了职业教育学生的人才培养要求。
本书由天津交通职业学院刘新宇主编，曹向红、李嘉泽副主编，张瑞静参编。其中，天津交通职业学院张瑞静编写项目一，天津交通职业学院刘新宇编写项目二，天津交通职业学院曹向红编写项目三、项目四、项目五，天津交通职业学院李嘉泽编写项目六。
由于编者水平有限，书中存在不妥之处在所难免，衷心希望广大读者批评指正。
编者
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 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
项目一汽油发动机电控系统整体认知001
一、项目情境引入001
二、项目相关知识001
（一）概述001
（二）发动机电控单元ECU的组成及功能007
（三）发动机电控系统故障自诊断系统测试011
三、项目实施012
（一）实施要求012
（二）实施步骤012
（三）注意事项013
小结014
习题及思考014
项目二汽油发动机电控燃油喷射系统检修015
一、项目情境引入015
二、项目相关知识015
（一）燃油喷射系统的分类015
（二）燃油喷射系统的组成017
（三）发动机燃油喷射系统传感器的结构原理019
（四）发动机燃油喷射系统执行器的结构原理037
（五）发动机断油控制过程042
（六）发动机燃油喷射的控制过程044
（七）喷油脉冲宽度的控制047
三、项目实施050
（一）实施要求050
（二）实施步骤050
（三）注意事项059
四、知识与技能拓展059
（一）ECU控制的燃油泵控制电路059
（二）燃油泵开关控制的燃油泵控制电路060
（三）燃油泵继电器控制的燃油泵控制电路060
小结061
习题及思考061
项目三汽油发动机电控点火系统检修062
一、项目情境引入062
二、项目相关知识062
（一）汽油机点火系统的作用062
（二）汽油机点火系统分类062
（三）对点火系统的基本要求063
（四）微机控制点火系统的结构组成064
（五）微机控制点火系统的控制过程068
（六）微机控制点火系统高压电的分配方式072
（七）爆震控制076
三、项目实施078
（一）实施要求078
（二）实施步骤078
（三）注意事项080
四、知识与技能拓展081
（一）点火系统波形分析081
（二）故障案例084
小结085
习题及思考085
项目四汽油发动机怠速控制系统检修086
一、项目情境引入086
二、项目相关知识086
（一）怠速控制阀的分类086
（二）怠速控制阀的原理087
（三）发动机怠速控制过程090
三、项目实施093
（一）实施要求093
（二）实施步骤093
（三）注意事项097
四、知识与技能拓展098
（一）电子节气门怠速控制执行机构098
（二）直动式节气门的基本设定099
小结099
习题及思考100
项目五汽油发动机辅助控制系统检修101
一、项目情境引入101
二、项目相关知识101
（一）汽车排放对环境影响101
（二）排放控制系统的分类101
（三）各种排放控制系统的原理102
三、项目实施117
（一）实施的要求117
（二）实施步骤117
（三）注意事项125
四、知识与技能拓展125
（一）可变配气相位与气门升程电子控制系统125
（二）VTEC系统工作原理126
小结127
习题及思考127
项目六汽油发动机电控系统典型故障检修128
一、项目情境引入128
二、项目相关知识128
（一）发动机电子控制系统故障诊断原则128
（二）电子控制系统的故障诊断的基本方法129
（三）电子控制系统的故障诊断的流程130
（四）电子控制系统的故障诊断的排除程序133
（五）电控发动机常见故障诊断的排除程序135
三、项目实施137
（一）实施要求137
（二）实施步骤137
（三）注意事项139
四、知识与技能拓展139
（一）启动困难139
（二）怠速过高140
（三）混合气过稀140
（四）混合气过浓140
（五）启动失速140
小结145
习题及思考145
参考文献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 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
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