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Reading measured value block
Readout specifications for exhaust gas recirculation
Display group 03 during idling (warm engine, coolant temperature not below +85°C)
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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/stroke
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308 mg/stroke
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54 %
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Duty cycle (actuation) of exhaust gas recirculation valve
▪ No specification
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Actual intake air mass
▪ As specified air mass in display zone 2 (tolerance ±20 mg/stroke: OK
▪ Air mass too small: Unmetered air in intake area
Excessive exhaust gas recirculation => check
▪ Air mass too great: insufficient exhaust gas recirculation => check
Engine idling for 10 minutes=> give brief burst of throttle
▪ Constant 425 mg/stroke: substitute value for 66 kW vehicles
▪ Constant 550 mg/stroke: substitute value for 81 kW vehicles
=> interrogate fault memory
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Air mass specified by control unit
▪ 230 - 370 mg/stroke: OK
▪ Greater than 370 mg/stroke: Engine too cold => run until warm
Injection quantity too high=> readout specifications for injection pump
Intake manifold temperature very high=> no correction possible
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Engine speed
▪ 780 ... 900 rpm OK
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