3175 Error Code For Unimog Tractor Models

There are 2 kind of error description.

Description:

ISM-IDI DPF Intake Temperature Sensor Low Voltage Amber

ISM-DI Exhaust Gas Temperature 1 Sensor Signal Too Low Amber

Hissing noise at expansion valve, Loss of refrigerant.Restriction in refrigerant system.Check receiver-dryer for uniformity of temperature.