Mb164 ml320cdi gearbox fault

[autodiags20]

nobody don't know?

[agabna]

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.

Thanks for help

hello
you said the fan is working in full speed and all fuses and wire are good
the speed of the fan was controlled by the mr + A/C through the control inside the fan

You have to see the actual value of the fan in the mr + ac to get why it working in full speed
Some times if you have problem in the inlet air temp
The fan work in full speed if it above 50
Deg
And also can delay the gear
And some times the problem from the fan itself
But the common for me i found the mr our other ecu is not good but not all the time
and after you change the egs ecu the fan worked normal

That is what I am talking about

You have change the egs ecu and you could diagnosis that means you have problem inside the ecu not in the wire
if you need scn coding your ecu should buy new
and then it very easy to to scn coding
Their is some co could send to you the scn

[Manmart]

I once did a Mercedes who also constantly working fan, after ignition. The problem was the refrigerant pressure sensor. Oxidized one pin and the sensor showed a pressure of 20 bar. Carefully look at the parameters of diagnostics.

[agabna]

I once did a Mercedes who also constantly working fan, after ignition. The problem was the refrigerant pressure sensor. Oxidized one pin and the sensor showed a pressure of 20 bar. Carefully look at the parameters of diagnostics.

hello
yes you are right some times it can work from the refrigerant pressure because that sesor has two function
pressure + temp