豐田凱美瑞轉向鎖定ECU故障導致無法啟動

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本文來自的技術員真實案例汽車維修上門關於解決豐田凱美瑞的轉向鎖定在不能啟動ECU麻煩的結果。問題:無法使用智能鑰匙啟動汽車發動機,並已確認濟鑰匙和發動機是OK.Sometimes它可以啟動汽車,有時它會開始後熄火,然後按後啟動按鈕它沒有反應,並按下後制動踏板,點火開關指示器關閉,後制動燈閃和打開和關閉在正常情況下安全指示器光。豐田凱美瑞轉向鎖定ECU故障導致無法啟動故障分析:根據上述症狀,初步判斷以下部分有故障:關閉系統ECU,相關線束,繼電器,啟動按鈕等部位。故障診斷:首先,使用豐田IT2獲取故障代碼:B2799,它的意思是:發動機防盜trouble.Then清除故障碼,並再次啟動汽車,故障代碼和問題仍然exist.Consult到汽車維修手冊,它列出可能的原因:線束故障,ECM,ID框中。發動機防盜及相關組件是太多measure.So我們試圖用同車型ECM和關鍵鈕在這款車進行測試,仍stay.In更換過程中的麻煩,另一個問題出現了:如果方向盤鎖定,汽車可以啟動。轉向鎖定系統原理:轉向鎖定ECU檢測鎖定桿位置(鎖定/解鎖),並自動傳送這個信號到主ECU和授權ECU。授權ECU確保是否遵循主ECU通信的方式來鎖定或解鎖轉向機。然後授權ECU通過ID碼發送鎖定或解鎖命令信號到轉向鎖定ECU。顯然,有很多複雜的部分需要test.Then我用IT2來讀取數據蒸汽“的Lck / UnlckRec(YES)”,這表明,轉向鎖止ECU接收鎖定/解鎖command.Use萬用表測試轉向鎖止ECU線束並找到終端E51-3和E51-1電壓為0.21V(標準條件:電壓為1V下,當電動機運行)當點火開關並打開左側門,然後我測試在另一相同車廂相同的端子模型和僅在幾秒鐘內成為10.59V的電壓(標準條件:電壓為10時的馬達未運行〜12V)。但是,所有的其他終端aredetected符合標準要求。根據測試結果,我推斷轉向鎖止ECU不能avtive TV.Then我刪除轉向鎖止ECU和發現它的一部分被腐蝕,然後我檢查它的修復它的歷史被淹沒3年前,用來代替所有的驅動程序除了轉向ECU ECU。更換新的轉向鎖ECU和完成匹配後,我遇到了新的麻煩,點火開關導通時,“ON”位置時,儀表盤有顯示,SRS指示燈不斷閃爍,啟動機不轉,遙控門鎖智能輸入功能工作。安裝了舊轉向鎖止ECU後,啟動機器開始轉動,但後來得到了同樣的麻煩。我想,當我的程序,它會產生新的麻煩。我初步判斷,當它的關鍵是匹配的授權ECU損壞,和線束可能有故障。再次測試之間ID中,ECM,主ECU和授權ECU的LIN電纜,它正在運行。連接豐田IT2讀取主ECU,它顯示G.SW-ACC.SW:ON,主ECU檢測出來不要在車內點火開關真實位置和顯示器防盜鎖- SET鍵。從上面的數據流中讀出,經授權的ECU未檢測到琴鍵和點火開關的位置。檢查授權ECU電源和接地線符合要求。根據以上數據和測試結果,我在猜測授權ECU有故障。由於授權的ECU和ID框之間的特殊關聯,那麼我同時訂購授權ECU和ID框。新零件到達後,再次註冊匹配鍵,完成符合安全指標不熄火都不是,啟動機器不能正常工作都不是,同樣的結果之後。後來我冷靜下來,反映地方有問題,然後我找到問題的所在,我立刻關閉點火開關轉到OFF位置,我用遙控器打開/關閉鎖,然後進入車內啟動,安全指標熄火和汽車可以啟動。幾天後,後司機開車回家,我叫司機,一切都OK,這意味著故障被完全固定。這導致授權ECU的原因有故障原因是點火開關未接通的OFF位置和ECU處於睡眠狀態,而不會主動上一次的節目後。但經過精加工程序就無法啟動,然後重複更換新老轉向鎖匹配導致授權ECU爆發。

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