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Reading measured value block
Readout specifications for exhaust gas recirculation
Display group 03 at idling speed (engine warm, coolant temperature not below +85 °C)
Engine code: AFF, AHU, AHH, AFN, AVG
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Read measured value block 3
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⇒
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◂ Indicated on display
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860 rpm
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290 mg/H
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308 mg/H
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54 %
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Duty cycle (activation) of exhaust gas recirculation valve
▪ No specification
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Intake air mass (actual value)
▪ If as specified in display zone 2 (tolerance ±20mg/H (mg/stroke)): okay
▪ Air mass too small: unmetered air in intake tract
Excessive exhaust gas recirculation => test
▪ Air mass too great: too little exhaust gas recirculation => test
If engine has been idling for 10 minutes or more => press accelerator briefly
▪ Constant substitute value => interrogate fault memory
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Air mass specified by control unit
▪ 230...370 mg/H (mg/stroke) okay
▪ > 370 mg/H: engine too cold => run engine till warm
Injection quantity too great => readout specifications for injection pump
Intake manifold temperature very high => correction not possible
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Engine speed
▪ 780...900 rpm okay
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