汽车专业英语(第7章)《汽车专业英语》王锦俞主编.ppt

汽车专业英语,Unit 7 Diagnostic Scan Tool and Oscilloscope 第七单元 故障诊断仪和示波器,7-1 Diagnostic Scan Tool (#1) 故障诊断仪,Kingtec Diagnostic System 金德故障诊断仪，金德故障诊断系统,Tech2=Tech2 Scan Tool#1 diagnostic tester TECH2故障诊断仪,Touch Panel Type Tester 触摸屏式故障诊断仪，触摸屏式测试仪,VAS 5051=Vehicle diagnostic, testing and information system 5051 （大众公司）5051型车辆诊断、测试和信息装置,What Is Hand-held Tester?,The DTCs that are stored in the ECU can be displayed on a handheld tester by establishing communication directly with the ECU. In addition, the hand-held tester can clear the DTCs from the ECUs memory. The hand-held tester provides other functions such as displaying the information data by communicating with the ECU by various sensors, or serving as a voltmeter or an oscilloscope.,7-2 Tech 2 Scan Tool Tech 2 故障诊断仪(#1),soft key 软键 select key 选择键 action key 作用键 function key 功能键,YES 是，可以 ENTER 进入，键入 EXIT 退出 NO 不 SHIFT 转换 PWR=power 电源,What Is Diagnosis?,The on-board diagnostic system is the vehicles self-diagnosis function that is provided by the ECU (Electronic Control Unit). Upon receiving the signals from the sensors that detect the conditions of the vehicle, the ECU transmits signals to the actuators optimally for the current conditions. The ECU receives signals from the sensors in the form of voltage. The ECU can determine the conditions of the system by detecting the changes in the voltage of the signals that are output by the sensors. Thus, the ECU constantly monitors the input signals (voltage), compares them to the standard values that are stored in the ECUs memory, and determines any abnormal conditions.,The graph on the left shows the characteristics of a water temperature sensor. Normally, the voltage of the water temperature sensor should vary between 0.1V and 4.8V, if a voltage within this range is input, the ECU determines that the condition is normal. If it is a short circuit (the input voltage is less than 0.1V) or an open circuit (the input voltage is more than 4.8V), the ECU determines that it is abnormal. If the ECU determines the input signal to be abnormal, the ECU illuminates the MIL (Malfunction Indicator Light) to alert the driver and stores a DTC (Diagnostic Trouble Code) in its memory.,7-3 Touch Panel Type Tester Operation 触摸屏式故障诊断仪操作,一. 设定菜单,二. 应用,三. 诊断菜单,Interpret Scan Tool Data to Determine System Condition,A scan tool is a test computer that communicates with the PCM and other on board computers of a vehicle .The scan tool reads and displays diagnostic information provided by the PCM such as DTCs and system operating data or parameters. Data transmitted to the scan tool from the PCM include both digital and analog values Digital parameters are often called switch parameters or signals and are either on or off high or low yes or no An analog parameter provides a signal value with a specific minimum-to-maximum range These kinds of data include analog voltage reading speed signal, temperature readings and frequency ranges.,Every item of data transmitted from the PCM to a scan tool has specific value of signal range described in the vehicle specifications. You must have access to or knowledge of these specifications and compare them to the scan tool readings to identify a system fault. Scan tool readings that identify an open or a short circuit are among the easiest to recognize If a resistive sensor displays a scan tool reading at or near the 5.0 volt reference voltage on which most such sensors operate the sensor circuit to the PCM is open If the scan tool voltage for such a sensor is at or near 0 volt the circuit is probably grounded.,7-4 DTCs Detection Item 故障码检测项目,Scan tool reading of PCM input and output signals reflect values as processed by the PCM. In some systems a sensor failure will cause the PCM to ignore the signal from the failed sensor and operate on backup values stored in its own memory. In this case，the PCM may transmit the backup values to the scan tool in place of the failed sensor signal. If any particular scan tool data reading does not make sense in relation to particular problem or symptom, you should test the system component directly with a voltmeter, ohmmeter, oscilloscope, frequency counter, or other test equipment. OBD diagnostic standards require a uniform library of diagnostic trouble codes (DTC) to be used by all carmakers. Additionally, all OBDsystems must transmit a basic list of 16 data items to a scan tool. Carmakers are free, however to “enhance” the onboard diagnostic capabilities of their control systems. Many systems provide much more than the minimum OBD diagnostic data requirements.,7-5 Scan Tool Data Table（一）#1 诊断仪数据（一）#1,Data Stream and Indication,7-6 Scan Tool Data Table（二） 故障诊断仪数据表（二）,Outline of OBD/MOBD,The MOBD (Multiples On-Board Diagnostic) system enables a hand-held tester to directly communicate with the ECU when the tester is connected to the DLC3 on the vehicle, in order to read Daces and data. 1. Characteristics of MOBD: Destinations: Europe and General Countries 5 digits (P#),(B#), and (C#) *Each “#” indicates a number or an alphabet. For some models with diesel EFI, only 2-digit Daces will be displayed even when the tester directly communicated. However is it possible to read DTC in detail through using the sub-code (1) or (2) than MIL blinking pattern. 2. Principal functions of MOBD: Able to read Daces Able to read the ECU data Able to perform active tests,7-7 Other Abbreviations of Scan Tool 故障诊断仪中其它缩略语,Accaccessory 附件 accacceleration 加速度，加速 A/C WOT=A/C Clutch Cut Wide-open-throttle 节气门全开时空调离合器断开 ACV=alternating current voltage 交流电压 A/Fair fuel ratio 空燃比 ASR=anti-slip regulation 牵引力控制，防滑调节 A/T或ATautomatic transmission 自动变速器 AVR=average 平均，平均的 B=battery (positive) voltage 蓄电池电压 BAbrake assist 制动辅助装置 CKPcrankshaft position 曲轴位置 CMPcamshaft position 凸轮轴位置 VSC=vehicle stability control ”,DCV=direct current voltage 直流电压 DLC=data link connector 故障诊断插座 ELDelectrical load detect 电气负荷检测 EPS=electronic power steering 电子动力转向 ESPelectronic stability program 电子稳定程序（德系车用法，相当于“车辆稳定性控制装置 FREQ=frequency 频率 FTfuel trim 燃油修正 IDidentification 标识， 标识符 I/Minspection and maintenance 检查/维护(常指排放控制方面的检查/维护) IPCinstrument panel cluster 组合仪表 ISC=idle speed control 怠速控制，怠速空气控制 ISSinput shaft speed 输入轴转速,max=maximum 最大的 min=minimum 最小的 OSSoutput shaft speed 输出轴转速 PSP=power steering pressure 动力转向油压 PWM=pulse width modulation 脉冲宽度调制，脉宽调制 PROMprogrammable read only memory 可编程只读存储器 SIRsupplemental inflatable restraint 辅助充气约束装置 SRSsupplemental restraint system 辅助约束装置 SW=switch 开关 TFRtransmission fluid pressure 变速器油压 TWCthree way catalytic converter 三效催化转化器 VSC=vehicle stability control 车辆稳定性控制装置,OBD /EURO STAGE OBD MONITOR INFORMATION,欧洲阶段排放标淮OBD监测器信息,7-8 VAG5051 Display VAG5051显示屏,Vehicle self-diagnosis 车辆自诊断 Select vehicle system 选择车辆系统 01-Engine electronics 01-发动机电子设备 41-Diesel pump electronics 41-柴油泵电子设备 02-Gearbox electronics 02-变速器电子设备 12-Clutch electronics 12-离合器电子设备 22-All-wheel drive electronics 22-全轮驱动电子设备 03-Brake system electronics 03-制动系统设备 14-Suspension electronics 14-悬架系统设备 24-Traction control system 24-牵引力控制系统设备 34-Self-leveling suspension 34-自调平悬架 15-Air bag 15-安全气囊 25-Immobilizer 25-防盗器，阻断器 35-Central locking 35-中控门锁 45-Interior monitoring 45-舱内监控装置 55-Headlight range control 55-前照灯照明范围控制装置 Test Instruments 测试设备 Go to 转到，到，去 Print 打印 Help 帮助,Vehicle Self-diagnosis 车辆自诊断 Select diagnostic function 选择诊断功能 02-Interrogate fault memory 02-查询故障存储 03-Final control diagnosis 03-最终控制诊断 04-Basic setting 04-基本设定 05-Erase fault memory 05-擦除故障存储 06-End output 06-结束输出 07-Code control unit 07-控制模块编码 08-Read data block 08-读取数