What is the cause of the high exhaust temperature fault in the Euro VI Auman?
3 Answers
Euro VI Auman high exhaust temperature fault is due to the car's water temperature being too high. Car water temperature too high: There are many reasons for high car water temperature, mostly caused by water pipe leakage and insufficient coolant. Common causes include: fan belt breakage, radiator or water pipe leakage, thermostat failure, engine oil leakage, etc. If the engine loses power while driving or produces severe knocking or pinging sounds, it is mostly due to engine overheating. Hazards of high car water temperature: High water temperature is commonly referred to as "boiling over." "Boiling over" can cause deformation or even damage to the cylinder head and cylinder block. In summer, high temperatures make it difficult for the radiator to dissipate heat, causing the engine water temperature to rise to varying degrees. Rubber hoses also soften more easily, leading to coolant leakage. Therefore, high water temperature or even boiling over becomes more common during driving.
Regarding the high exhaust temperature issue with the Euro VI Aumark, I've driven many Euro VI trucks and encountered similar problems, usually caused by particulate filter clogging or regeneration failure. Euro VI models specifically added this system to reduce emissions, but if you operate at low speeds for extended periods or use inferior diesel, soot accumulates in the filter and can't be expelled, causing exhaust temperatures to skyrocket. Additionally, issues with the exhaust gas recirculation system, such as a stuck EGR valve or faulty sensor, can cause the engine to inject more fuel, raising temperatures further. If the urea injection system's dosage is inaccurate or the nozzle is clogged, it can also affect temperature control. It's best to use manufacturer-recommended fuel and avoid frequent short trips with repeated starts and stops to prevent regeneration interruptions. Excessively high temperatures can easily damage aftertreatment system components and increase repair costs. If the warning light comes on, don't delay—take it to an authorized service center immediately to read the fault codes, inspect, and replace parts to prevent minor issues from becoming major problems.
As someone who frequently deals with truck maintenance, I've observed that most of the exhaust overheating issues in the Euro VI Aumark trucks stem from problems in the aftertreatment system. Start with the basics: the regeneration function of the particulate filter might be interrupted, such as due to low vehicle speed or false sensor readings preventing automatic cleaning, leading to heat buildup and high exhaust temperatures. If the EGR cooler is leaking or clogged, restricted exhaust gas recirculation can also cause a sharp temperature rise. Carbon buildup in the urea pump nozzle or a faulty dosing module can render the SCR system ineffective, disrupting temperature control. Simple at-home checks include inspecting the coolant level to ensure it's sufficient for antifreeze, preventing engine overheating from transferring. Also, check if the urea tank has enough solution and refill it with qualified product if empty. Overheating may shorten the DPF's lifespan, so it's best to regularly clean the air filter to assist. If the fault light appears, take it to a professional shop for diagnostic tool testing of voltage data—don't force it to run.
