Idle Speed Setpoint/Actual Value Comparison

Note the following points with regard to evaluating the idle speed setpoints:

• The clutch must not be operated
  
• Heating switched off to ensure the engine speed is not boosted to facilitate increased heating output
  
• All electrical loads switched off, no drive stage selected and no air conditioning
  
• The values may be slightly higher if the battery is discharged
  
• The values may deviate from the setpoints if the distance covered by the vehicle (mileage) is < 1000 km
  

Scope of test of idle speed setpoint/actual value comparison

Full operational reliability of the oxygen sensor after the catalytic converter serves as the reference for ensuring the same vehicle conditions.

The following values are tested:

• Smooth running values
  
• Engine speed
  
• Ignition timing
  
• Idle air adaptation
  
• Air mass
  
• Injection duration
  
• Load signal
  
• Opening of idle speed control valve
  
• Inlet camshaft position
  
• Exhaust camshaft position
  
• Idle-lambda adaptation, bank 1 +2
  
• Partial load-lambda adaptation, bank 1 + 2
  
• Idle adaptation deviation
  
• Voltage value of pedal position sensor 1 + 2
  
• Voltage value of throttle potentiometer 1 + 2
  
• Partial load adaptation deviation