Today, the customer drove about half an hour in the city. The engine failure indicator and the side slip indicator suddenly turned on. After driving about 10 kilometers, the fault indicator was still on. The customer was annoyed and completely repaired because he had just bought a car for less than 10 days. Customers reported that the car did not have a high-quality installation.

　　故障識別:維修人員根據(jù)客戶描述對車輛進行檢查。1. 當技術(shù)人員啟動車輛時，發(fā)現(xiàn)發(fā)動機故障指示燈和側(cè)滑指示燈都亮著，并觀察里程表為220KM，確認結(jié)果與客戶描述相符。2. 使用GTS讀取故障代碼P0500速度傳感器。3.觀察車輛。該車輛沒有任何精品安裝。技術(shù)人員初步判斷故障原因:1、速度信號電路是開路還是短路。2. 組合儀表總成失效。3.ECM失敗。

　　Fault identification: Maintenance personnel inspect the vehicle according to customer description. 1. When the technicians start the vehicle, they find that the engine fault indicator and the side slip indicator are on, and observe the odometer is 220 KM. The results are consistent with the customer description. 2. Use GTS to read the fault code P0500 speed sensor. 3. Observe the vehicle. The vehicle does not have any high-quality installation. Technicians preliminarily determine the causes of the failure: 1. Whether the speed signal circuit is open or short-circuit. 2. Failure of assembled instrument assembly. 3. ECM failed.

　　故障維修:1。故障代碼為P0500速度傳感器。首先，查閱維修手冊，了解故障代碼的情況是:車輛行駛時沒有向ECM (First logic)發(fā)送速度信號。

　　Troubleshooting: 1. The fault code is P0500 speed sensor. First of all, consult the maintenance manual to understand the fault code: the vehicle does not send speed signals to the ECM (First Logic) when driving.

　　2. 檢查電路圖，了解速度信號傳輸過程:ABS傳感器→ABS計算機→儀器裝配(放大速度信號)→ECM、導(dǎo)航、ECU等。

　　2. Check the circuit diagram to understand the speed signal transmission process: ABS sensor ABS computer instrument assembly ECM, navigation, ECU, etc.

　　當齒輪為D2，發(fā)動機轉(zhuǎn)速約為1000 RPM時，車輛將以0 km/h的速度行駛。如果發(fā)生故障，ECM數(shù)據(jù)流中不顯示車速。

　　When the gear is D2 and the engine speed is about 1000 RPM, the vehicle will travel at a speed of 0 km/h. If a fault occurs, the ECM data stream does not show the speed.

　　4. 刪除故障代碼。行駛200米后，故障指示燈將再次亮起。

　　4. Delete the fault code. After driving 200 meters, the fault indicator will be turned on again.

　　5. 配合客戶對車輛進行測試，讀取ABS系統(tǒng)的數(shù)據(jù)流。顯示四輪速度和車輛速度，表明速度信號可以從速度傳感器傳輸?shù)紸BS計算機。同時，ABS系統(tǒng)的速度與測速儀的速度一致，表明速度信號可以從ABS計算機傳輸?shù)浇M合儀表。

　　5. Cooperate with customers to test vehicles and read data stream of ABS system. It shows the four-wheel speed and vehicle speed, indicating that the speed signal can be transmitted from the speed sensor to the ABS computer. At the same time, the speed of ABS system is consistent with that of the tachometer, which indicates that the speed signal can be transmitted from the ABS computer to the combined instrument.

　　6. 讀取電力系統(tǒng)的數(shù)據(jù)流，發(fā)現(xiàn)無論在何種工況下，車速始終為0 km/h。同時，巡航系統(tǒng)在車速計為60KM/H時運行，巡航系統(tǒng)無法正常設(shè)置。開車時打開音響系統(tǒng)，喇叭的聲音不會隨著車速的變化而改變。

　　6. Read the data flow of the power system and find that the speed of the vehicle is always 0 km/h under any working condition. At the same time, the cruise system can not be set up normally when the speedometer is 60KM/H. Turn on the sound system while driving, and the sound of the horn will not change with the speed of the car.

　　7. 通過以上檢測分析，速度信號從速度傳感器中斷到組合儀表，無法到達ECM。

　　7. Through the above detection and analysis, the speed signal is interrupted from the speed sensor to the combined instrument, and can not reach the ECM.

　　8. 測量組合儀與ECM速度信號線束F2接線端子12與A24接線端子8之間的電阻值小于1歐姆，正常。

　　8. The resistance between the measuring instrument and the terminal 12 of ECM speed signal bundle F2 and terminal 8 of A24 is less than 1 ohm, which is normal.

　　9. 示波器用于測量組合儀表與ECM之間速度信號的波形電壓，車輛運行時電壓始終為0 v

　　9. The oscilloscope is used to measure the waveform voltage of the speed signal between the combined instrument and ECM. The voltage of the vehicle is always 0 V when it is running.

　　10. 判斷組合儀表不能對速度信號進行放大。提供車輛更換儀器的故障排除。三天后，他回到客戶那里，說問題已經(jīng)解決，故障指示燈沒有再亮。

　　10. Judging that the combination instrument can not amplify the speed signal. Provide troubleshooting for vehicle replacement instruments. Three days later, he returned to the customer and said that the problem had been solved and the fault indicator had not been turned on again.