Hello,

I have mercedes ml in garage. Do diagnostic with mb star. In engine no fault data, but coling fan work in full speed no comunication with transmision ecu and transfer case box. In can getaway coding ok and no faults. All fuses ok.
Maybe have this problem.Yes transmission ecu is dead.
Bought a used transmission ECU, but the car than the forward or back. Comunication to transmision ok to ism ok no fault data. I think need reprogram it. I do intial start up scn coding .
1.Perfom scn coding with data storage device.
2.Manually enter scn coding.
I dont have data storage. Maybe someone can help manually scn coding?