MB SD C4 Diagnose MB VITO commercial vehicle can not drive

I have a mileage of about 43,000 km of the 2013 MB 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

Equipment I use :

MB SD C4 Plus DELL D630 4GB Laptop

I used 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



I replaced the transmission assembly, and torque converter cleaning (without replacement) and tubing, then test, fault completely ruled out.

Thanks for the MB SD C4 testing, where I buy it ? I bought it from obd2shop.co.uk !

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