Sensors

Logic of naming sensors in VW-group is simple it contains "G" (german "Geber") + sensor number. The sensor number is unique. Here you can find fitting location, connectors and pins description, some information about sensors signals.

To our mind, sensors information is reference, so there is only simple search by sensor number.

G

Audi R8 42 (2007- )
Audi A8 4E (2002 -)
Audi A6 4F (2005- )
Audi A3 8P (2003- )
G151_4E_87_____1_0702_21_Funktion

Audi A8 4E (2002 -). G151 Описание

Right vent temperature sender -G151

 

See Fitting Location, Fig.: N87-0806

A Connector of temperature sensor -G151

1 - Right vent temperature sender -G151

 

The air conditioner is regulated within an overall temperature range between 18°C and 28°C. However, the possibilities of individual climate settings for each selectable position must be set against the fact that the climate zones are not physically separated from each other.

In the selected automatic function the air conditioner uses the sensors to determine how much the air for the climate zone concerned needs to be heated or cooled in order to deliver the selected temperature.

In this, the air conditioner control unit determines the flow rate of the engine coolant in the heating circuit through the heat exchangers or the cooling power of the refrigerant circuit, as appropriate. The air conditioner control unit decides according to the requirement, for example that the regulated warm or cooled air for ventilation is routed to the "driver" and "front passenger" climate zone and, with the (optional) 4-zone air conditioner, to the left and right rear passengers.

The design layout with two adjacent heat exchangers provides a right/left split of the passenger compartment ventilation.

The temperature of these two air flows for the left and right halves of the vehicle is primarily determined by the temperature setting at the front seat positions.

The right vent temperature sender -G151 is located in the heater/air conditioner unit behind the right side heat exchanger in the air vent duct to the right footwell.

The air flowing out of the heater/air conditioner unit into the passenger compartment is recorded with a temperature-sensitive resistor and so is available as an influencing variable in the temperature monitoring and control function of the operating and display unit -J255. The temperature sender -G151 is designed as an NTC sensor. The resistance is evaluated as a signal from the control unit and regulates the air distribution and delivery rate of the blower.

 

K Notes:

J The value of the out-flow temperature is determined as a reference signal to the dash panel temperature sensor -G56 on the right and left sides.

J As the temperature falls the electrical resistance increases.

J The sender is self-diagnosis compatible. A fault detected in the sender is only registered by the operating and display unit -J255 if the coolant temperature is detected as above 50°C.

J If the fault: "short to earth" is detected by the operating and display unit -J255, the value 150°C is entered in display zone 2 of measured value block 017.

J If the fault: open circuit/short to positive is detected by the operating and display unit -J255, the value -70°C is entered in display zone 2 of measured value block 017.

J If the right vent temperature sender -G151 fails, the value of the intact vent temperature sender -G150 is adopted. Operation is maintained.

J If both senders (-G150 and -G151) fail, the air temperature downstream of the heat exchangers can no longer be recorded and the temperature control fails. This causes the heating power to be controlled in preset temperature increments by the operating and display unit -J255, using a substitute value for each side.

J Experience shows that temperature senders are the most frequent cause of temperature control faults. They do not usually fail immediately, but deliver false values to the control unit based on an additional wire resistance as a result of damage or corrosion in the connector contacts. Thus a comparison of the values of both senders (-G150 and -G151) in the relevant display zones is recommended for optimum diagnosis.

J A Air conditioner; Rep.Gr. 87; Removing and installing right vent temperature sender -G151

J A Current flow diagram; ELSA

 

Measured value block 017

 

Display zone 1:

 

Readout of left vent temperature sender -G150 in °C

 

Display zone 2:

 

Readout of right vent temperature sender -G151 in °C

 

Display zone 3:

 

Readout of centre vent temperature sender -G191 in °C

 

Display zone 4:

 

Display zone currently not used




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