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Unit_5_engine_diagnosis_system.ppt

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UNIT_5_ENGINE_DIAGNOSIS_SYSTEM
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Unit 5 Engine Diagnosis System,1. How To Proceed With TroubleshootingThe Engine Control System consists of the sensors, Engine Control Module (ECM) and actuators. The ECM receives signals from various sensors, judges the operating conditions and determines the optimum injection duration, timing, ignition timing and idle speed. In general, the Engine Control System is considered to be a very intricate system to troubleshoot. But, the fact is that if you proceed to inspect the circuit one by one following the procedures directed in service manual, troubleshooting of this system is not complex.,Troubleshooting 故障查找(检修)Engine Control Module 发动机控制模块duration 持续时间intricate 复杂的procedure 程序service manual 维修手册,,This section explains the most ideal method of troubleshooting and tells how to carry out the necessary repairs.(1) Customer problem analysisUsing the customer problem analysis check sheet for reference, ask the customer as much details as possible about the problem.(2) Check and clear diagnostic trouble code (recheck)Before confirming the problem symptom, first check the diagnostic trouble code and make a note of any malfunction code which is output, then clear the code.( Hint: Output of the malfunction code indicates that there is a malfunction in the circuit indicated).However, it does not indicate whether the malfunction is still occurring or occurred in the past and returned to normal. In order to determine this, the problem symptoms should be confirmed in step (4) first and the diagnostic trouble code be rechecked in step (6).,sheet 单子reference 参考recheck 预检symptom 症状,,Accordingly, if troubleshooting is begun based on the malfunction code only in diagnostic trouble code check in step (2), it could result in a misdiagnosis and make it more difficult to locate the cause of the problem.(3) Setting the test mode diagnosis, (4) Problem symptom confirmation, (5) Symptom simulation.In order to find out the trouble more quickly, set the diagnosis check in test mode and with higher sensing ability of the ECM, confirm the problem symptoms. If the trouble does not reappear, use the symptom simulation method to make sure the trouble is reproduced.(6) Diagnostic trouble code check in test modeCheck the diagnostic trouble code in test mode. If the malfunction code is output, proceed to step (8). If the normal code is output, proceed to step (7).(7) Basic inspection Carry out basic inspection such as the spark check and fuel pressure check, etc.,misdiagnosis 误诊simulation 模拟reproduce 复制,,(8) Diagnostic trouble code chartIf the malfunction code is displayed, proceed to inspect the circuit indicated by the chart for each code.(9) Matrix chart of problem symptomsIf the normal code is displayed in the diagnosis in test mode, perform troubleshooting according to the inspection order in the Matrix Chart of Problem Symptoms.(10) Parts inspectionWhen the Matrix Chart of Problem Symptoms instructs to check the parts, proceed to parts inspection section included in service manual.(11) Circuit inspectionDetermine if the malfunction is the sensor, actuator, wire harness, connector or the ECM.(12) Adjustment, RepairAfter the cause of the problem is located, perform adjustment or repairs by following the inspection and replacement procedures in service manual.,chart 图表matrix chart 检查表instruct 指示wire harness 线束adjustment 调节,,2. Basic Inspection(1) Inspect battery voltageBattery positive voltage should be 11 V or more when engine is stopped.(2) Check idle speed1) Shift transmission into “N” position or neutral.2) Warm up engine at normal operating temperature.3) Switched off all accessories.4) Switched off air conditioning.5) Connect tachometer test probe to terminal IG (–) of data link connector 1, Check idle speed.Idle speed: 700 ~ 800 rpm(3) Check ignition timing1) Shift transmission into “N” position or neutral.2) Warm up engine at normal operating temperature.3) Keep the engine speed at idle.,neutral 空挡accessory 附属设备tachometer 转速表probe 探针,,4) Connect terminals TE1 and E1 of data link connector 1.5) Using a timing light, connect the tester to No.1 high–tension cord. Check ignition timing. Ignition timing: 10°TDC at idle. (4) Check fuel pressure1) Be sure that fuel is enough in tank.2) Turn ignition switch on.3) Connect terminals FP and + B of data link connector 1. Check for fuel pressure in the return hose. At this time, you will hear fuel return noise.(5) Check for sparkDisconnect the high–tension cord from the distributor and hold the end about 12.5 mm from the ground, see if spark occurs while the engine is being cranked.Hint: To prevent excessive fuel injected from the injectors during this test, don’t crank the engine for more than 1–2 seconds at a time.,TDC 上止点data link connector 数据链路连接器,,3. Diagnostic Trouble Code Check(1) Initial conditions. 1) Battery voltage 11 V or more. 2) Throttle valve fully closed. 3) Transmission in neutral position. 4) Air conditioning switched off.(2) Diagnostic trouble code check in the normal mode 1) Turn ignition switch off. 2) Connect terminals TE1 and E1 of data link connector 1 or 2. 3) Turn ignition switch on. 4) Read the diagnostic trouble code on malfunction indicator lamp on the combination meter. 5) After completing the check, Turn ignition switch off and disconnect terminals TE1 and E1.(3) Diagnostic trouble code check in the test mode 1) Turn ignition switch off. 2) Connect terminals TE2 and E1 of data link connector 1 or 2.,Initial 初始的,,3) Turn ignition switch on.Hint: To confirm that the test mode is operating, check that the malfunction indicator lamp flashes when the ignition switch is turned to ON. If the malfunction indicator lamp does not flash, proceed to troubleshooting of the TE2 terminal circuit.4) Start the engine.5) Simulate the conditions of the malfunction described by the customer.6) After the road test, connect terminals TE1 and E1 of data link connector 1 or 2.7) Read the diagnostic trouble code on malfunction indicator lamp on the combination meter.8) After completing the check, Turn ignition switch off and disconnect terminals TE1,TE2 and E1.Hint:1) The test mode will not start if terminals TE2 and E1 are connected after the ignition switch is turned on..,flash 闪烁 road test 路试,,2) When vehicle speed is 5 km/h or below, diagnostic trouble code “42” (Vehicle speed signal) is output, but this is not abnormal.3) When the engine is not cranked, diagnostic trouble code “43” (Starter signal) output, but this is not abnormal4. Diagnostic Trouble Code Clearance(1) After repair of the trouble areas, the diagnostic trouble code retained in the ECM memory must be cleared out by removing the EFI fuse (15A) for 10 seconds or more, with the ignition switch OFF.Hint: Cancellation can also be done by removing the battery negative (–) terminal, but in this case, other memory systems (clock, etc.) will also be cancelled out.(2) After cancellation, road test the vehicle to check that a normal code is now read on the malfunction indicator lamp.If the same diagnostic trouble code appears, it indicates that the trouble area has not been repaired thoroughly.,,Translation Skill (5)词的增译,词的增译就是在译文中增加一些原文中无其形而有其义的词。英语中有时为了避免重复,常省略一些词。但在汉语译文中省略了这些词时,就会使译文意义不明确,不通顺。所以在翻译汉语时,有时增词是很必要的。一、用汉语动词补充英语名词,使译文通顺 The molecules get closer and closer with the pressure. 随着压力增加,分子越来越接近。二、增加表示名词复数的词 The moving parts of a machine are often oiled that friction may be greatly reduced. 将机器的各个可动部件经常加注润滑油,可大大减少摩擦。三、在形容词前加名词 The washing machine of this type is indeed cheap and fine. 这种类型的洗衣机真是物美价廉。,,四、具体指出被动语态中暗含的逻辑主语 To explore the moon’s surface, rockets were launched again and again. 为了勘探月球的表面,人们一次又一次地发射火箭。五、增加表示数量意义的概括性的词,起修饰润色作用 The frequency, wavelength and speed of sound are closely related. 声音的频率、波长与速度三者密切相关。六、增加使译文语气连贯的词 Reading makes a full man; conference a ready man; and writing an exact man. 阅读使人充实;会谈使人敏捷;写作使人精确。,Exercises(练习)1.Translate the following into Chinese,(1)normal mode(2)warm up(3)switch off(4)data link connector(5) combination meter (6)malfunction code,(1)正常模式(2)暖机(3)断电;熄火(4)数据链路连接器(5) 组合仪表 (6)故障码,2.Translate the following into English,(1)发动机工作温度(2)初始条件(3)蓄电池负极(4)基本检查(5)路试(6)修理或更换,(1)engine operating temperature(2)initial conditions(3)battery negative terminal(4)basic inspection(5)road test(6)repair or replace,3.Translate the following sentences into English,(1)The ECM contains a built–in self–diagnosis system by which troubles with the engine signal network are detected and aMalfunction indicator lamp onthe instrument panel lights up.(2)A malfunction indicator informs the driver that a malfunction hasbeen detected. The light goes off automatically when the malfunction has been repaired.,(1)ECM包含一个嵌入式自诊断系统。该系统可以对发动机信息网络进行检测同时,仪表板上的故障指示灯会亮。(2)故障指示灯亮则通知司机已经检测到故障。当故障排除后,指示灯自动熄灭。,,(3)A test mode function has been added to the functions of the self–diagnostic system of the normal mode for the purpose of detecting malfunctions such as poor contact, which are difficult to detect in the normal mode.(4)The Malfunction indicator lamp will come on when the ignition switch is turned ON and the engine is not running.(5)When the normal code is displayed in the diagnostic trouble code check, troubleshooting should be performed in the order for all possible circuits to be considered as the causes of the problems.,(3)自诊断系统增加检测模式功能目的是可以检测正常模式下很难检测的项目,如接触不良故障。(4)当点火开关置于ON位置,发动机没有启动时,故障指示灯会亮。(5)当读取故障码显示为正常模式时,应该按照顺序,对所有可能被视为引起故障原因的电路进行检测。,
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