Smooth running measurement

Test conditions:

• No fault stored
  
• Switched off automatic climate control
  
• Heater to minimum
  
• Warm-up period finished,
  i.e. when the large cooling circuit and the engine oil are oils warmed up.
  

Optimum starting point for measurement:

• When the electric fan has shut down just after a work interval.
  
• Intake air temperature below 40 °C.
  If this is not possible due to a high ambient temperature, this is not an exclusion condition.
  As the intake air temperature increases, so the probability increases that the measurement will become invalid.