速騰點火線圈爆裂分析
1、速騰車點火線圈爆裂 Sagitar’ignition coil burst
故障現象 The fault phenomenon：
客戶反應汽車嚴重抖動，加速無力甚至熄火，同時伴隨ASR防側滑燈點亮。From customers reaction that the vehicle has severe dithering in the driving, and cannot Accelerate even flameout. Also the ASR anti-slide light up.
用VAG5052A查詢故障：Using VAG5052A for querying failure:
01發動機電子系統：點火線圈1啟動對正極短路（偶發）
Engine electronic system: The first of ignition coil starts the positive terminal gets short circuit.
03制動電子系統：發動機電子系統故障 Brake electronic system: Engine electronic system failure
44電子助力轉向系統：發動機電子系統故障 Electronic power steering system: Engine electronic system failure.
因為它們同屬于動力總線上的系統，通過網關聯系在一起，共同分享動力總線上的信息，總線上任何一部分出現故障，在別的系統上就會根據預先設定的程序記錄故障信息。由此初步判斷，制動電子系統和電子助力轉向系統故障的出現是因為發動機故障引起的，于是，著重檢查發動機的故障。由發動機故障碼，懷疑問題在點火線圈或者其線路上。
啟動發動機，怠速運轉大約10分鐘就出現發動機嚴重抖動，ASR燈亮，發動機熄火。重新啟動，發動機又可以正常運轉，用VAG5052讀取發動機數據流第14組，此時數據都正常。四個缸沒有失火現象。當故障現象再次出現時出現失火記憶。由此判斷故障點在點火線圈，點火線圈線路，或發動機控制單元上。
Because they belong to the system on the power line, through the gateway linked together to share the information on the power bus, any part of the bus failure, in other systems will be based on pre-set procedures to record fault information. It is tentatively judged that the failure of the brake electronic system and the electronic power steering system is caused by the engine failure, and the inspection of the engine failure is focused. By the engine fault code, suspect the problem in the ignition coil or its line.
Starting the engine, idle for about 10 minutes, the vehicle has severe dithering in the driving, and cannot speed up even flameout. Also the ASR anti-slide light would light up. And then restart the vehicle, the engine can run normally, with VAG5052 read the engine data stream 14 group, this time the data are normal. Fire memory when failure occurs again. The fault points are judged on the ignition coil, ignition coil line, or engine control unit.
拆下二次空氣泵，拔下點火線圈的插頭，檢查插頭內沒有銹蝕，用萬用表測量點火線圈的四根線，Ｔ４/2有12V正電，T4/4對地通。T4/1 , T4/3到發動機電腦J361的T121/112,T121/113連接正常。拆下點火線圈，發現點火線圈的底部有裂紋，于是更換點火線圈，重新試車，故障沒有出現。到此問題似乎解決了，但過了不久，故障再次出現！而且發動機無法啟動了
Removing the secondary air pump, and remove the plug of the ignition coil, checking that there is no rust in the plug, measure the four lines of the ignition coil with the multimeter, and the t4/2 has 12V positive, and t4/4 to the computer J361, T121/113 connect normal. The ignition coil was removed and a crack was found at the bottom of the ignition coil, so the ignition coil was replaced and the vehicle was retested. Failure did not occur. The problem seems to be solved, but after a while, the failure reappears! And the engine failed to start.
到站檢查，發現點火線圈又爆了。看來問題的根本不在點火線圈，而是與點火線圈有關的線路或者發動機控制單元上。重新檢查點火線圈的線路。的線路。如（圖一）
At the station, the ignition coil was found to be explosive again. It seems that the problem is not in the ignition coil, but in the wiring or engine control unit that relates to the ignition coil. Re-examine the line of the ignition coil. (figure 1)
（圖一）(figure 1)
點火線圈的二號針腳接的是從J363(SIMOS控制單元供電繼電器)經過SB14保險絲過來的12V正電; 第一和第三針腳接的是J361（發動機控制單元）的控制端，其中一號腳控制一四缸的點火，三號腳控制的是二三缸的點火。就是說，發動機正常工作時，當一缸在壓縮上止點時，J361會斷開一號腳的接地，從而在一四缸的次級線圈產生感應電壓，點燃一缸混合氣，一缸作功。測量一三腳到J361線路，正常。參照電路圖可以看出：點火線圈的接地線也是曲軸箱通風加熱電阻N79的搭鐵線，N79的一號針腳接的是從J519（中央電器控制單元）經過SC29保險絲過來的12V正電。微信公眾號 汽修技術服務 試想，如果642搭鐵點搭鐵不良，J519的正電會經過N79直接和點火線圈的四號針腳相連，這樣點火線圈的初級回路就被阻斷，造成無法點火，發動機控制單元J361會記錄點火線圈對正極短路故障。檢查642搭鐵線，在發動機空氣濾清器下面，發現642搭鐵點的固定螺母已經松動。清理搭鐵點，重新固定好，換上新的點火線圈。為了驗證故障點，清除故障碼，啟動發動機，人為斷開642搭鐵點，故障出現，證明故障點就在642搭鐵線松動。
The second pins of the ignition coil comes from the J363 (power relay of the SIMOS control unit) through the SB14 fuses and produces the 12V positive Voltage. The first and third pins are controlled by J363 (engine control unit), one of the which controls the ignition of a four-cylinder, the second and third cylinders are controlled by the third pins. This is to say, the normal of the engine, when the first check point on the compression, J361 would disconnect, thus induced voltage in the secondary coil of matters cylinder, lit a crock of mixture, a crock of doing work. Measure the first and the third cylinder to J361 line, it shows normal. Reference to the circuit diagram can be seen: the ground line of the ignition coil is also an iron wire of the crankcase, and the one on the N79, and the one on the N79 is from J519, which is the 12V positive charge from the sc-29 fuses. Wechat public motor repair technology services, just thinking, if 642 iron points were not fit, the positive charge of J519 would be connected directly with the fourth stitching of the ignition coil at N79, so that the primary loop of the ignition coil would be blocked and the ignition coil would not be ignited, and the engine control unit J361 would record the ignition coil to the positive terminal short circuit fault. Check the 642 for the iron wire, under the engine air filter, find that the fixed nut of 642 iron point has been loosened. Cleaning up the iron point , reattach and replace with a new ignition coil. In order to verify the failure point, remove the fault code, start the engine, and manually disconnect 642 to the iron point, the fault occurs, and the fault point is found to be loose in 642.