Reading measured value block (data block)
Readout specifications for unit injectors - vehicles with 96 kW engine
Display Group 001 at idling speed (engine warm, coolant temperature not below 80 °C)
|
|
|
|
Display group 1
|
⇒
|
◂ Indicated on display
|
|
|
XXXX rpm
|
XX.X mg/stroke
|
XX.X °CA
|
XXX.X °C
|
◂ Display zones 1 ... 4
|
|
|
|
|
|
|
Coolant temperature ▪ 80...110 °C: okay ▪ < 80 °C: => run engine till warm
|
|
|
|
|
|
Specified injection period required by control unit: 3 ... 8 °CA okay
|
|
|
|
|
Injection quantity: 3.0 ... 13.0 mg/stroke okay ▪ < 3.0 mg/stroke: ▪ Unit injectors defective => Renew unit injectors, Page 23-38
|
|
|
|
Engine speed ▪ Manual gearbox 860 ... 940 rpm okay ▪ Automatic gearbox 790 ... 870 rpm okay
|
|
|
2)Check fuel supply system for leaks:
|
|
Display Group 004 at idling speed (engine warm, coolant temperature not below 80 °C)
|
|
|
|
Display group 4
|
|
◂ Indicated on display
|
|
|
XXXX rpm
|
XX.X °B(A)TDC
|
XX.X °CA
|
XX.X °CA
|
◂ Display zones 1 ... 4
|
|
|
|
|
|
|
Synchronisation angle: -3 ... +3 °CA okay
|
|
|
|
|
|
|
▪ > +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
|
=> Test-G40, Page 23-112
|
|
|
|
|
|
|
Hall sender -G40 loose, Sender wheel defective or turned out of position
|
=> Test3)
|
|
|
|
|
|
Injection period specified by control unit: 3 ... 8 °CA okay
|
|
|
|
|
Commencement of injection specified by control unit : 4°BTDC ... 2.5°ATDC okay ▪ > 4°BTDC: Engine too cold => run engine till warm
|
|
|
|
Engine speed ▪ Manual gearbox 860 ... 940 rpm okay ▪ Automatic gearbox 790 ... 870 rpm okay
|
|
|
3) Testing position of camshaft and sender wheel:
|
|
Display Group 004 at full throttle (road test, coolant temperature not below 80 °C)
Important: Always observe safety precautions => Page 01-1.
Important: Observe rules for road test at full throttle => Page 01-89.
|
|
|
|
Display group 4
|
|
◂ Indicated on display
|
|
|
XXXX rpm
|
XX.X °BTDC
|
XX.X °CA
|
XX.X °CA
|
◂ Display zones 1 ... 4
|
|
|
|
|
|
|
Synchronisation angle: -3 ... +3 °CA okay ▪ > +3°CA or < -3°CA:=>Page 01-123
|
|
|
|
|
|
Injection period specified by control unit: 16 ... 28 °CA okay
|
|
|
|
|
Commencement of injection specified by control unit: -13 ... -23 °CA okay ▪ > -13° CA: engine too cold => run engine till warm
|
|
|
|
Engine speed: 2800...3200 rpm okay
|
|
|
|
|
Display group 018 at idling speed (engine warm, coolant temperature not below 80°C)
|
|
|
|
Display group 18
|
|
◂ Indicated on display
|
|
|
XX
|
XX
|
XX
|
XX
|
◂ Display zones 1 ... 4
|
|
|
|
|
|
|
Status of unit injector solenoid valve 4: 0 okay ▪ Other reading than 0: =>Display zone 1
|
|
|
|
|
|
Status of unit injector solenoid valve 3: 0 okay ▪ Other reading than 0: => Display zone 1
|
|
|
|
|
Status of unit injector solenoid valve 2: 0 okay ▪ Other reading than 0: => Display zone 1
|
|
|
|
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)
|
|
|
2)Testing fuel supply system for leaks:
|
|
|