What is the reason for the failure of the four-wheel drive system?
2 Answers
Vehicle warning lights usually illuminate due to issues with the fuel emission system. Here is some relevant information: Full-time drive: The front and rear wheels always maintain a 4-wheel drive mode, with the engine output torque distributed at a 50:50 ratio between the front and rear wheels during driving. Full-time drive offers excellent driving control and tracking performance, but it consumes more fuel and has poor fuel economy. Part-time drive: The driver can switch between 2-wheel drive or 4-wheel drive modes by engaging or disengaging the transfer case based on road conditions. This is the most common drive mode for general off-road vehicles or 4WD SUVs.
During my last off-road adventure in the mud with my SUV, the four-wheel drive system suddenly got stuck, which gave me quite a scare. Upon inspection, it was found that the friction plates in the central differential were severely worn, causing uneven torque distribution. Common causes of four-wheel drive failures include damaged differentials, bent drive shafts, or errors in the electronic control unit (ECU), such as when wheel speed sensors get clogged with mud and send incorrect signals. This can cause the vehicle to lose traction on slopes, making it prone to skidding or losing control. Preventive measures include regularly cleaning the undercarriage, avoiding sudden acceleration in extreme road conditions, and having professionals periodically check fluid levels and system coding. If you encounter trouble, immediately switch to two-wheel drive mode and drive slowly to a safe area.
