Intake Air Temperature Sensor DDE 4.0

The intake air temperature sensor is integrated in the air mass meter and measures the temperature of the fresh air drawn in by the engine.

The intake air temperature serves as a measurement variable for the following functions:

• Injection rate control
  
• Rail pressure control
  
• EGR control
  
• Charge-air pressure control
  
• Preheater time control
  

Function

The DDE control module supplies the intake air temperature sensors with voltage and ground as follows:

• U_HR, battery voltage
  
• U_HFM, supply voltage 5 V
  
• M_HFM, ground
  

Depending on the air temperature, the intake air temperature sensor returns a measurement voltage via the A_TANS signal to the DDE control module.

Troubleshooting

Fault code 0110 ”intake air temperature sensor” is stored if the mass air flow sensor is defective and a substitute value is used in the DDE control module.