MB Star troubleshot Mercedes VITO can not drive issue
I have a mileage of about 43,000 km of the 2013 Mercedes-Benz VITO commercial vehicle, there is a problem: Start hanging D block, the vehicle can not travel.
First, confirm pick Symptom,found hanging D fail to do so the carriage and Guadang abnormal sound transmission instantaneously.
I had purchased the diagnostic system from mbstarshop.com:
I used MB Star diagnostic SD Connect C4 rapid detection of vehicles found in the transmission control unit (ETC) stores a DTC 0731: untrusted or transmission gear skid (gear, and stored)
N15 / 3 transmission control unit receives an engine load signal, vehicle speed signal transmission input / output speed sensor signal, the shift by controlling the electromagnetic valve. Combined with fault code analysis possible causes:
1) input / output speed sensor failure;
2) transmission control unit fault;
3) valve to control the transmission line fault between the units;
4) gear clutch slip.
I Have done the following checking:
1. Remove oil pan, ready to swap with the normal vehicle body, and found a large number of iron filings on the oil pan.
2. Remove the valve body, and found there are a lot of iron the body.
3. The presence of iron described internal transmission wear, break down the transmission and found badly worn gear set
1. Remove oil pan, ready to swap with the normal vehicle body, and found a large number of iron filings on the oil pan.
2. Remove the valve body, and found there are a lot of iron the body.
3. The presence of iron described internal transmission wear, break down the transmission and found badly worn gear set
I replaced the transmission assembly, and torque converter cleaning (without replacement) and tubing, then test, fault completely ruled out.
