FENDT 900 Vario COM III B092 Boost Pressure/Temperature Sensor

FENDT 900 Vario COM III tractor Component B092 – Sensor, charge air pressure/temperature reports the boost pressure and charge air temperature to the A051 – ECU, engine control unit (EDC 7).

The B092 – Sensor, charge air pressure/temperature is a combination sensor. Two sensors with a shared power supply are mounted in the same component.

 

Preparations:

AGCO EDT 2026

AGCO 2×4 CANUSB 930203400

Fendt Fendias 2024 v2

Deutez Serdia 4.0 or Serdia 2010

 

 

Function of the pressure sensor:

The charge pressure (physical variable) is converted into a voltage signal (electrical variable). The pressure and the signal voltage are proportional, so that as the charge pressure increases, the signal voltage increases proportionately. (“LDA function”)

 

Function of the temperature sensor:

The resistance of the temperature sensor changes depending on the temperature. The sensor has either an NTC (nega tive temperature coefficient) or a PTC (positive temperature coefficient) characteristic.

 

The B092 – Sensor, charge air pressure/temperature is an NTC sensor, i.e. as the temperature rises, the resistance of the sensor falls.

 

Circuit diagram of the B092 charge air pressure/temperature sensor

 

 

Component B092 – Sensor, charge air pressure/temperature reports the boost pressure and charge air temperature to the A051 – ECU, engine control unit (EDC 7).

The B092 – Sensor, charge air pressure/temperature is a combination sensor. Two sensors with a shared power supply are mounted in the same component

 

Function of the pressure sensor:

The charge pressure (physical variable) is converted into a voltage signal (electrical variable). The pressure and the signal voltage are proportional, so that as the charge pressure increases, the signal voltage increases proportionately. (“LDA function”)

 

Function of the temperature sensor:

The resistance of the temperature sensor changes depending on the temperature. The sensor has either an NTC (negative temperature coefficient) or a PTC (positive temperature coefficient) characteristic.

 

The B092 – Sensor, charge air pressure/temperature is an NTC sensor, i.e. as the temperature rises, the resistance of the sensor falls.

Circuit diagram of the B092 charge air pressure/temperature sensor

 

Used for controlling the engine (A051 – ECU, engine control unit (EDC 7).)

The B092 – Sensor, charge air pressure/temperature picks up the boost pressure and the charge air temperature.

The signals are forwarded to the A051 – ECU, engine control unit (EDC 7)..

In the A051 – ECU, engine control unit (EDC 7)., the boost pressure is used to control the engine (“LDA function”).

 

For charge air temperature warning message (on the A007 – Instrument panel)

The A051 – ECU, engine control unit (EDC 7). picks up the charge air temperature from the B092 – Sensor, charge air pressure/temperature and forwards it to the A050 ECU, basic control unit via the G BUS.

The “Warning threshold” for the charge air temperature is stored in the A050 ECU, basic control unit.

 

If the charge air temperature rises above the “warning threshold”, the A050 – ECU, basic control unit issues an error message.

 

The error message is sent to the A007 – Instrument panel via the K BUS and appears on the display.

 

NOTE:

The B092 – Sensor, charge air pressure/temperature can be read using the Deutz SERDIA 4.0  diagnostics program.