Requirements for the air mass system test

In order to ensure that the air mass system test delivers a meaningful result, the following requirements must be met:

• The engine must be at operating temperature
• All additional loads, e.g. air conditioning system or seat heating, must be switched off
• No electrical faults in the following systems may be stored in the DDE fault memory:
  • Air mass flow sensor
  • EGR controller
  • Charging pressure actuator
  • Charging pressure sensor
  • Intake air temperature sensor
  • Charge-air temperature sensor
  • Ambient pressure sensor
  • Throttle valve
  • Swirl flaps
• The air intake duct and air filter must be OK
• Diesel particle filter must not be clogged
• Regeneration of the diesel particle filter may be active or requested
• The throttle valve and swirl flaps must be functional