Symptom: Jetta ATi car after the start hanging D block does not go.
     Fault check: first connect the VAS5051 engine diagnostic instrument, query the variable box control unit, trouble-free recording, read 08 data block, the solenoid valve voltage is normal, the electronic control system is faulty, only mechanical part, first check the oil pressure , The main oil pressure normal, and then check the oil pressure, the internal changes in the oil tanker out of some, with a paste of taste, according to the paste can be sure that the clutch film has been burned, the owner agreed to disassemble the gearbox, found Deviation box oil is dirty, K3 clutch burned. Recognized by the owner, replace the K3 clutch assembly, cleaning the gearbox housing, installed, filling the gearbox oil, commissioning, troubleshooting.
     Maintenance summary: the car driving 90,000 km has not changed the self-change box oil, because the variable box driving 90,000 km, the oil has deteriorated, reducing lubrication performance, resulting in impurities to increase the wear and tear of the parts, the car under normal circumstances, Use D gear drive, so lead to K3 clutch all burned.