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Reading measured value block
Readout specifications for vehicle performance
Display group 08 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85 °C)
- Engine code AFF
Important: The fault reader must be secured on the rear seat and operated from this position. Observe the safety precautions applicable to test drives .
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Read measured value block 8
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◂ Indicated on display
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3990 rpm
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38.4 mg/stroke
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31.0 mg/stroke
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35.7 mg/stroke
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Injection quantity limitation according to recognised air mass greater than 35 mg/stroke: OK
▪ Less than 35 mg/stroke detected air mass insufficient
=> Test air mass meter, Page 23-83
Check exhaust gas recirculation at full throttle=>
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Injection quantity limitation according to engine speed (torque limitation) 29.0 - 31.5 mg/stroke OK
▪ Less than 29.0 mg/stroke engine speed too high or too low
▪ Greater than 31.5 mg/stroke: increase in injection quantity as a result of tuning
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Desired injection quantity (accelerator pedal position) greater than 36 mg/stroke OK
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Engine speed, 2800 ... 4000 rpm OK
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Display group 08 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85 °C)
- Engine codes: AHU, AHH
Important: The fault reader must be secured on the rear seat and operated from this position. Observe the safety precautions applicable to test drives => Page 23-1.
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Read measured value block 8
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◂ Indicated on display
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3990 rpm
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38.4 mg/stroke
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35.0 mg/stroke
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35.7 mg/stroke
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Injection quantity limitation according to recognised air mass greater than 35 mg/stroke: OK
▪ Less than 35 mg/stroke detected air mass insufficient
=> Test air mass meter, Page 23-83
Check exhaust gas recirculation at full throttle =>
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Injection quantity limitation according to engine speed (torque limitation) 34.2 - 36.5 mg/stroke: OK
▪ Less than 34.2 mg/stroke engine speed too high or too low
▪ Greater than 36.5 mg/stroke: increase in injection quantity as a result of tuning
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Desired injection quantity (accelerator pedal position) greater than 36 mg/stroke OK
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Engine speed, 2800...4000 rpm OK
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Display group 08 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85 °C)
- Engine code AFN
Important: The fault reader must be secured on the rear seat and operated from this position. Observe the safety precautions applicable to test drives => Page 23-1.
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Read measured value block 8
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◂ Indicated on display
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3990 rpm
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43.4 mg/stroke
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40.4 mg/stroke
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42.0 mg/stroke
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Injection quantity limitation according to recognised air mass greater than 40 mg/stroke: OK
▪ Less than 40 mg/stroke detected air mass insufficient
=> Test air mass meter, Page 23-83
Check exhaust gas recirculation at full throttle=>
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Injection quantity limitation according to engine speed (torque limitation) 38.0 - 43.5 mg/stroke: OK
▪ Less than 38.0 mg/stroke engine speed too high or too low
▪ Greater than 43.5 mg/stroke: increase in injection quantity as a result of tuning
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Desired injection quantity (accelerator pedal position) greater than 42 mg/stroke OK
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Engine speed, 2800 ... 4000 rpm OK
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Display group 10 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85 °C)
- Engine codes: AFF, AHU, AHH
Important: The fault reader must be secured on the rear seat and operated from this position. Observe the safety precautions applicable to test drives => Page 23-1.
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Read measured value block 10
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◂ Indicated on display
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830 mg/stroke
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1030 mbar
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1968 mbar
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100 %
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Accelerator pedal position: 100 %: OK
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Current boost pressure: 1800 ... 2050 mbar OK
If outside tolerance: boost pressure control defective => display group 11, Page 01-83
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Current air pressure: no specification
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Intake air mass: 750 ... 850 mg/stroke: OK
▪ Less than 750 mg/stroke Engine speed below 2000 rpm or above 4000 rpm
Boost pressure too low, observe display zone 3
Unmetered air between air mass meter and turbocharger
Air mass meter defective
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Display group 10 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85 °C)
- Engine code AFN
Important: The fault reader must be secured on the rear seat and operated from this position. Observe the safety precautions applicable to test drives=> Page 23-1.
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Read measured value block 10
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◂ Indicated on display
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963 mg/stroke
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1030 mbar
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1968 mbar
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100 %
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Accelerator pedal position: 100 %: OK
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Current boost pressure: 1800...2250 mbar okay
If outside tolerance: boost pressure control defective => display group 11, Page 01-83
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Current air pressure: no specification
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Intake air mass: 800...1100 mg/stroke: OK
▪ Less than 800 mg/stroke Engine speed below 2000 rpm or above 4000 rpm
Boost pressure too low => observe display zone 3
Unmetered air between air mass meter and turbocharger
Air mass meter defective
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