A/C Pressure/Temperature Sensor -G395-
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NOTE:
Switch pressures, removing and installing switches as well as switch arrangement and version. Refer to vehicle specific refrigerant circuit - OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information).
The A/C Pressure/Temperature Sensor -G395- is installed instead of the High Pressure Sensor -G65- or the Refrigerant Circuit Pressure Sensor -G805-.
- The A/C Pressure/Temperature Sensor -G395-, the Refrigerant Circuit Pressure Sensor -G805- and the High Pressure Sensor -G65- are available in different versions. Currently the sensor's only exterior difference is the parts number. Therefore, make sure that the part numbers are correctly allocated when replacing them (part number allocation ). Reason: These sensors produce different signals that can only be identified by the corresponding control modules. Refer to Vehicle Diagnostic Tester (function "OBD" or "Guided Fault Finding " for the A/C system), refer to OVERVIEW - REFRIGERANT CIRCUIT (vehicle-specific repair information).
- When voltage is applied, the A/C Pressure/Temperature Sensor -G395- (and the Refrigerant Circuit Pressure Sensor -G805- exchange information via the Data bus (for example via the "LIN-Bus") with the corresponding control module. The relevant control module uses this information to calculate the pressure (and temperature) in the refrigerant circuit and any faults detected are signaled to the control module.
- The A/C pressure/temperature sensor -G395- transmits the measured value for the pressure in the refrigerant circuit and the measured temperature to the connected control module. The refrigerant circuit pressure sensor -G805- only transmits the measured value for the pressure within the refrigerant circuit to the connected control module. Even if only the pressure signal is evaluated on most vehicles, no A/C pressure/temperature sensor -G805- is or will be installed in a vehicle in which a refrigerant circuit pressure sensor -G395- is designed.
- The temperature measured by the A/C Pressure/Temperature Sensor -G395- differs from the actual refrigerant temperature in the refrigerant circuit because of the A/C pressure/temperature sensor -G395- design and its component location. Because of this, it is not currently evaluated and is not used to regulate the A/C system. Refer to A/C Pressure/Temperature Sensor -G395-, CHECKING PRESSURE SIGNAL (vehicle-specific repair information).
- This information is used for example by the Climatronic Control Module -J255- control head or the Vehicle Electrical System Control Module -J519- to calculate the pressure in the refrigerant circuit and to actuate the downstream control modules (coolant fan control module, Engine Control Module etc.) via the data bus system. These control modules then actuate, for example, the A/C Cutch -N25-, the coolant fan and the motor. Refer to Vehicle Diagnostic Tester (function "OBD" or "Guided Fault Finding " and OVERVIEW - BELT PULLEY, A/C COMPRESSOR WITH A/C Clutch -N25- (vehicle-specific repair information).