Audi A6 1.8T (equipped with awl engine and gearbox 012) has a range of about 98000 km, with acceleration fault and black smoke.

　　采用VAS505l進行故障診斷，存儲發動機控制系統的無故障代碼。檢查點火狀態，正常;讀取動態數據流量、空氣流量數據和增壓壓力數據是否正常;測試燃料系統的壓力。燃料壓力大約是220千帕，很低。

　　Vas505l is used for fault diagnosis and no fault code of engine control system is stored. Check whether the ignition status is normal; read the dynamic data flow, air flow data and boost pressure data; test the fuel system pressure. The fuel pressure is about 220 kPa, very low.

　　更換燃油泵后，燃油壓力基本恢復正常，加速性能有所改善，但仍存在黑煙現象;經過檢查火花塞，我發現火花塞已經很久沒有更換了，所以我決定更換火花塞。然而，更換火花塞后，故障仍然沒有消除。

　　After replacing the fuel pump, the fuel pressure basically returned to normal, the acceleration performance was improved, but there was still black smoke; after checking the spark plug, I found that the spark plug had not been replaced for a long time, so I decided to replace the spark plug. However, after replacing the spark plug, the fault is still not eliminated.

　　檢查氣缸壓力，正常;使用VAS5051讀取數據組032，發現氧傳感器信號電壓低，跳動緩慢。噴油時間修正量為+ 25%，達到極限。因此，懷疑是氧傳感器的故障引起的。然而，更換了兩個氧傳感器后，故障仍然存在。，故障只能被認為是發動機控制單元損壞的結果。

　　Check the cylinder pressure, normal; use vas5051 to read data group 032, and it is found that the signal voltage of oxygen sensor is low and the beat is slow. The injection time correction is + 25%, reaching the limit. Therefore, it is suspected that the fault of the oxygen sensor is the cause. However, after replacing both oxygen sensors, the fault still exists. Finally, the fault can only be considered as a result of damage to the engine control unit.

　　故障排除后，更換發動機控制單元測試，故障排除。

　　After troubleshooting, replace the engine control unit for testing and troubleshooting.

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