Main task

The sensor is a combined pressure and temperature sensor. It measures the prevailing absolute pressure and temperature in the charge air pipe.

The temperature is used to:

• Together with the boost pressure determine the density of the charge air. The charge air density is used by airmass control to correct the throttle angle.
• Correct the charge air control valve PWM ratio. A higher PWM ratio is required at high temperature to obtain the same air mass/combustion.
• Correct ignition angle. An advanced timing is required at low temperatures.
• Blocking certain diagnostics:
  • Blocks certain diagnostics at temperatures lower than -7°C.
  • Reactivates certain diagnostics at temperatures higher than +5°C.