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Reading measured value block (data block)
Readout specifications for unit injectors - vehicles with 74 kW engine
Display Group 001 at idling speed (engine warm, coolant temperature not below 75°C)
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Display group 1
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⇒
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◂ Indicated on display
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XXXX rpm
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XX.X mg/stroke
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XX.X °CA
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XXX.X °C
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◂ Display zones 1 ... 4
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Coolant temperature: 75 ... 110 °C: okay
▪ < 75 °C: => run engine till warm
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Specified injection period required by control unit: 3 ... 8 °CA (crankshaft angle) okay
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Injection quantity: 3.0 ... 9.0 mg/stroke okay
▪ < 3.0 mg/stroke:
▪ Unit injectors defective => Renew unit injectors, Page 23-38
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Engine speed:
▪ Manual gearbox: 860 ... 940 rpm okay
▪ Automatic gearbox: 790 ... 870 rpm okay
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2)Check fuel supply system for leaks:
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Display Group 004 at idling speed (engine warm, coolant temperature not below 75°C)
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Display group 4
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◂ Indicated on display
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XXXX rpm
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XX.X °B(A)TDC
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XX.X °CA
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XX.X °CA
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◂Display zones 1 ... 4
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Synchronisation angle: -3 ... +3 °CA okay
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▪ > +3 °CA or < -3 °CA:
▪ Hall sender -G40 defective;
▪ Gap width between sender and sender wheel on camshaft not okay;
▪ Open circuit or short circuit to earth
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=> Test-G40,
Page 23-112
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Hall sender -G40 loose,
Sender wheel defective or turned out of
position
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=> Test3)
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Injection period specified by control unit: 3 ... 8 °CA okay
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Commencement of injection specified by control unit : 4°BTDC ... 2°ATDC okay
▪ > 4°BTDC: Engine too cold => run engine till warm
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Engine speed:
▪ Manual gearbox: 860 ... 940 rpm okay
▪ Automatic gearbox: 790 ... 870 rpm okay
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3) Testing position of camshaft and sender wheel:
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Display Group 004 at full throttle (road test, coolant temperature not below 75°C)
Important: Always observe safety precautions => Page 01-1.
Important: Observe rules for road test at full throttle => Page 01-89.
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Display group 4
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◂ Indicated on display
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XXXX rpm
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XX.X °BTDC
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XX.X °CA
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XX.X °CA
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◂ Display zones 1 ... 4
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Synchronisation angle: -3 ... +3 °CA okay
▪ > +3 °CA or < -3 °CA: => Page 01-111
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Injection period specified by control unit: 19 ... 24 °CA okay
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Commencement of injection specified by control unit: -16 .... -25°CA okay
▪ > -16° CA: engine too cold => run engine till warm
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Engine speed
▪ 2800 ... 3200 rpm okay
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Display group 018 at idling speed (engine warm, coolant temperature not below 75°C)
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Display group 18
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◂ Indicated on display
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XX
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XX
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XX
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XX
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◂ Display zones 1 ... 4
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Status of unit injector solenoid valve 4: "0" okay
▪ Other reading than 0: =>Display zone 1
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Status of unit injector solenoid valve 3: "0" okay
▪ Other reading than 0: => Display zone 1
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Status of unit injector solenoid valve 2: "0" okay
▪ Other reading than 0: => Display zone 1
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Status of unit injector solenoid valve 1: "0" okay
▪ Other reading than 0:
▪ Unit injector solenoid valves defective =>Test unit injector solenoid valves, Page 23-32
▪ Fuel starvation or air in fuel supply system => Test2)
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2)Check fuel supply system for leaks:
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