常見故障及診斷思路?

Common faults and diagnostic ideas

發動機故障?

Engine malfunction

發動機抖動：這是奔馳發動機常見問題之一。火花塞老化或積碳可能是原因之一，火花塞負責點燃混合氣，若工作不良，混合氣無法充分燃燒，便會導致發動機抖動。可以通過觀察火花塞電極磨損情況和積碳程度來判斷是否需要更換。此外，噴油嘴堵塞也會引起類似問題，噴油嘴負責將燃油噴射到氣缸內，堵塞時噴油不均勻，影響燃燒效果。專業維修人員一般會使用專業設備對噴油嘴進行清洗或更換。?

Engine shaking: This is one of the common problems with Mercedes Benz engines. Aging or carbon buildup of spark plugs may be one of the reasons. Spark plugs are responsible for igniting the mixture. If they do not work properly, the mixture cannot burn fully, which can cause engine shaking. It can be determined whether replacement is necessary by observing the wear and carbon deposition of the spark plug electrode. In addition, clogged fuel injectors can also cause similar problems. Fuel injectors are responsible for injecting fuel into the cylinder, and when clogged, the fuel injection is uneven, affecting the combustion effect. Professional maintenance personnel generally use specialized equipment to clean or replace fuel injectors. ?

發動機啟動困難：可能是蓄電池電量不足，奔馳車電子設備多，對電量需求大，長時間停放或蓄電池老化都可能導致電量不足，此時用專業檢測儀檢測蓄電池電壓即可判斷。還有可能是燃油泵故障，燃油泵負責將燃油從油箱輸送到發動機，若其工作異常，無法提供足夠壓力，發動機便難以啟動。維修時需檢查燃油泵工作壓力和電路連接情況。?

Difficulty starting the engine: It may be due to insufficient battery power. Mercedes Benz cars have many electronic devices, which require a large amount of power. Long term parking or aging of the battery may also cause insufficient power. At this time, a professional tester can be used to detect the battery voltage to determine the issue. It is also possible that the fuel pump is malfunctioning. The fuel pump is responsible for delivering fuel from the fuel tank to the engine. If it works abnormally and cannot provide sufficient pressure, the engine will be difficult to start. During maintenance, it is necessary to check the working pressure and circuit connection of the fuel pump. ?

發動機故障燈亮：這涉及的原因較為復雜，氧傳感器故障較為常見。氧傳感器用于監測排氣中氧含量，以此調節混合氣濃度，故障時會使混合氣過濃或過稀，導致故障燈亮起。維修人員需讀取故障碼，根據故障碼提示進一步檢測氧傳感器的信號電壓等參數，判斷是否需要更換。另外，空氣流量計故障也會影響發動機進氣量的測量，導致混合氣比例失調，引發故障燈亮，同樣需通過專業檢測設備對其進行檢測維修。?

Engine malfunction light on: The reasons involved are complex, and oxygen sensor failures are common. The oxygen sensor is used to monitor the oxygen content in the exhaust gas, in order to adjust the concentration of the mixture. In the event of a malfunction, the mixture may become too rich or too lean, causing the malfunction light to turn on. The maintenance personnel need to read the fault code and further test the signal voltage and other parameters of the oxygen sensor according to the fault code prompt to determine whether replacement is needed. In addition, a malfunction in the air flow meter can also affect the measurement of engine intake volume, leading to an imbalance in the mixture ratio and causing the malfunction light to turn on. It also requires professional testing equipment for inspection and maintenance. ?

自動變速器故障?

Automatic transmission malfunction

換擋沖擊：奔馳自動變速器出現換擋沖擊，可能是變速器油液不足或變質。變速器油不僅起到潤滑作用，還傳遞動力，油液不足會導致油壓不穩定，變質則會影響其性能。維修時需先檢查油位，若不足添加同型號油液，若變質則需徹底更換。此外，電磁閥故障也可能引發換擋沖擊，電磁閥控制變速器內部油壓和換擋執行機構，故障時會使換擋時機不準確。維修人員需使用診斷儀檢測電磁閥工作狀態，必要時進行更換。?

Shift shock: Mercedes Benz automatic transmission may experience shift shock due to insufficient or deteriorated transmission fluid. Transmission oil not only provides lubrication, but also transmits power. Insufficient oil can lead to unstable oil pressure, and deterioration can affect its performance. When repairing, it is necessary to first check the oil level. If it is insufficient, add the same type of oil. If it deteriorates, it needs to be completely replaced. In addition, a malfunction of the solenoid valve may also cause a shift shock. The solenoid valve controls the internal oil pressure and shift actuator of the transmission, and in the event of a malfunction, the shifting timing may be inaccurate. Maintenance personnel need to use a diagnostic tool to check the working status of the solenoid valve and replace it if necessary. ?

變速器打滑：多片離合器磨損過度是常見原因。多片離合器負責連接和斷開變速器內部不同齒輪組，實現換擋，磨損后會導致動力傳遞不暢，出現打滑現象。維修時需拆解變速器，檢查離合器片的磨損情況，進行更換。另外，變速器油壓過低也會造成打滑，需檢查油泵工作情況和油路是否存在泄漏。?

Transmission slippage: Excessive wear of the multi plate clutch is a common cause. The multi plate clutch is responsible for connecting and disconnecting different gear sets inside the transmission to achieve gear shifting. Wear and tear can cause poor power transmission and slip. During maintenance, it is necessary to disassemble the transmission, check the wear of the clutch plates, and replace them. In addition, low transmission oil pressure can also cause slippage, and it is necessary to check the working condition of the oil pump and whether there are leaks in the oil circuit. ?

底盤故障?

Chassis malfunction

懸掛系統異響：奔馳的懸掛系統較為復雜，常見的異響原因是減震器漏油。減震器負責緩沖路面顛簸，漏油后其阻尼力下降，無法有效減震，行駛時會發出異常響聲。維修人員通過觀察減震器外觀是否有油漬來判斷，若漏油需及時更換減震器。此外，懸掛球頭磨損也會產生異響，球頭連接懸掛部件，磨損后間隙變大，在行駛中會發出 “咯噔” 聲，需檢查球頭間隙，必要時進行更換。?

Suspension system abnormal noise: Mercedes Benz's suspension system is relatively complex, and the common cause of abnormal noise is shock absorber oil leakage. The shock absorber is responsible for buffering road bumps. After oil leakage, its damping force decreases, making it unable to effectively absorb vibrations and producing abnormal noises while driving. The maintenance personnel determine whether there are oil stains on the appearance of the shock absorber, and if there is oil leakage, the shock absorber should be replaced in a timely manner. In addition, the wear of the suspension ball head can also produce abnormal noise. The ball head is connected to the suspension components, and the clearance increases after wear, making a "clunking" sound during driving. It is necessary to check the clearance of the ball head and replace it if necessary. ?

制動系統故障：制動片磨損是常見問題，奔馳車制動性能強，制動片磨損相對較快。當制動片厚度接近磨損極限時，儀表會提示更換。若未及時更換，不僅制動效果下降，還可能損壞制動盤。維修時直接更換符合規格的制動片即可。另外，制動盤表面磨損不均勻會導致制動時車輛抖動，此時需對制動盤進行打磨或更換。?

Brake system malfunction: Brake pad wear is a common problem. Mercedes Benz cars have strong braking performance, but brake pad wear is relatively fast. When the thickness of the brake pads approaches the wear limit, the instrument panel will prompt for replacement. If not replaced in a timely manner, not only will the braking effect decrease, but it may also damage the brake disc. Simply replace the brake pads that meet the specifications during maintenance. In addition, uneven wear on the surface of the brake disc can cause the vehicle to shake during braking, and in this case, the brake disc needs to be polished or replaced. ?

維修工具與設備?

Maintenance tools and equipment

專業診斷儀?

Professional diagnostic equipment

奔馳汽車電子系統復雜，專業診斷儀必不可少。如奔馳原廠的 STAR 診斷儀，它能與車輛的各個控制模塊進行通信，讀取故障碼、數據流，對車輛系統進行編程和設碼等操作。通過診斷儀，維修人員能快速準確地判斷故障所在，大大提高維修效率。例如，當發動機故障燈亮起時，使用 STAR 診斷儀讀取故障碼，若顯示為某傳感器故障，可根據故障碼提示進一步檢查傳感器及其線路。?

Mercedes Benz's electronic system is complex, and a professional diagnostic tool is essential. Like Mercedes Benz's original STAR diagnostic instrument, it can communicate with various control modules of the vehicle, read fault codes and data streams, program and code the vehicle system, and perform other operations. Through the diagnostic instrument, maintenance personnel can quickly and accurately determine the location of the fault, greatly improving maintenance efficiency. For example, when the engine malfunction light is on, use the STAR diagnostic tool to read the fault code. If it shows a sensor fault, further check the sensor and its circuit according to the fault code prompt. ?

專用工具?

Special tools

火花塞套筒：奔馳發動機火花塞規格特殊，需要專用的火花塞套筒才能拆卸和安裝。這種套筒尺寸精確，能避免在操作過程中損壞火花塞。?

Spark plug socket: Mercedes Benz engine spark plugs have special specifications and require specialized spark plug sockets for disassembly and installation. This sleeve has precise dimensions and can avoid damaging the spark plug during operation. ?

變速器油加注工具：奔馳自動變速器對油液加注量和加注方式有嚴格要求，專用的變速器油加注工具能確保準確加注適量的油液，保證變速器正常工作。例如，在更換變速器油時，使用專用加注工具可將新油準確注入變速器，避免因加注量不當導致變速器故障。

Transmission oil filling tool: Mercedes Benz automatic transmission has strict requirements for the amount and method of oil filling. The dedicated transmission oil filling tool can ensure accurate filling of the appropriate amount of oil to ensure the normal operation of the transmission. For example, when replacing transmission oil, using a specialized filling tool can accurately inject new oil into the transmission to avoid transmission failure caused by improper filling.

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