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Self-diagnosis
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 codes AGR and ALH
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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3290 rpm
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40.4 mg/stroke
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37.2 mg/stroke
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38.0 mg/stroke
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Injection quantity limitation according to recognised air mass
36...39 mg/stroke OK
▪ < 36 mg/stroke: detected air mass insufficient
▪ => Test air mass meter, Page 23-69
▪ Exhaust gas recirculation at full throttle => check
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Injection quantity controlled according to engine speed (torque limitation) 34...39 mg/stroke OK.
▪ < 34 mg/stroke: engine speed too high or too low
▪ > 39 mg/stroke: increase in injection quantity as a result of tuning
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Desired injection quantity (accelerator pedal position) 39 mg/stroke OK
▪ < 39 mg/stroke: Accelerator pedal not fully depressed, incorrectly set or defective => test
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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 AHF and ASV
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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3290 rpm
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41.4 mg/stroke
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39.8 mg/stroke
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41.4 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
▪ => Check air mass meter => Page 23-69
▪ Exhaust gas recirculation at full throttle => check
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Injection quantity controlled according to engine speed (torque limitation) 38...42 mg/stroke OK.
▪ Less than 38 mg/stroke: engine speed too high or too low
▪ Greater than 42 mg/stroke: increase in injection quantity as a result of tuning
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Desired injection quantity (accelerator pedal position) greater than 40 mg/stroke OK
▪ Less than 40 mg/stroke: accelerator pedal not fully depressed, incorrectly adjusted or defective
▪ Check accelerator position sender -G79
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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 AGR and ALH
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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1850 mbar
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100 %
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Accelerator pedal position: 100 % OK
▪ < 100 %: accelerator pedal not fully depressed
▪ Accelerator pedal position sensor -G79 incorrectly adjusted
▪ or defective => check
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Current boost pressure: 1800...2050 mbar OK
If outside tolerance: boost pressure control defective => display group 11, Page 01-87
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Current air pressure: no specification
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Intake air mass: > 750 mg/stroke OK
▪ < 750 mg/stroke: Engine speed below 2000 rpm or above 4000 rpm
▪ Boost pressure too low => note 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 codes AHF and ASV
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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100.0 %
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Accelerator pedal position: 100.0 % OK
▪ Less than 100.0 %: accelerator pedal not fully depressed
▪ Accelerator pedal position sensor -G79 incorrectly adjusted
▪ or defective => check
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Current boost pressure: 1800...2250 mbar OK
If outside tolerance: boost pressure control defective => display group 11, Page 01-88
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Current air pressure: no specification
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Intake air mass: greater than 800 mg/stroke OK.
▪ less than 800 mg/stroke: Engine speed below 2000 rpm or above 4000 rpm
▪ Boost pressure too low => note display zone 3
▪ Unmetered air between air mass meter and turbocharger
▪ Air mass meter defective
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