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Reading measured value block
Readout specified values for injection pump
Display group 01 during idling (warm engine, coolant temperature not below +85 °C)
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Read measured value block 1
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◂ Indicated on display
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860 rpm
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5.6 mg/stroke
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1.680 V
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87.3 °C
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Coolant temperature
▪ 85 ... 100 °C OK
▪ Less than 85 °C: => Run engine until warm
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Voltage from modulating piston movement sender -G149
▪ 1.250 ... 1.750 V: OK
▪ Less than 1.250 V Injection pump too rich => replace injection pump
▪ Greater than 1.750 V Engine loaded => switch off consumption units
Engine too cold => allow engine to warm up, see display zone 4
Injection pump too lean=> replace injection pump
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Injection quantity
▪ 2.0 ... 9.0 mg/stroke: OK
▪ Less than 2.0 mg/stroke Injection pump too rich => replace injection pump
▪ Greater than 9.0 mg/stroke: Engine loaded => Switch off consumption units
Engine too cold => allow engine to warm up, see display zone 4
Injection pump too lean=> replace injection pump
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Engine speed
▪ 780 ... 900 rpm OK
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Display group 01 with attempted start (if engine does not start)1)
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Read measured value block 1
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◂ Indicated on display
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230 rpm
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37.4 mg/stroke
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2.780 V
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14.3 °C
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Coolant temperature
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Voltage from modulating piston movement sender G149 (quantity adjuster returns modulating piston position to control unit)
▪ Periodic voltage increases: okay (pump is injecting)
▪ Less than 1.000 V Metering control closed =>observe display zone 2, only if specified injection quantity okay =>replace injection pump
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Specified injection quantity (control unit actuating metering control in injection pump)
▪ Periodic injection quantity increases: okay (pump is being activated)
▪ 0.0 mg/stroke System fault => interrogate fault memory, Page 01-8
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Engine speed
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1) If the electrical system voltage falls below 10.8 V during the attempted start, the V.A.G 1551 fault reader will abort the diagnosis.
Display group 19 with ignition on
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Read measured value block 19
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◂ Indicated on display
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0.780 V
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4.350 V
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No display
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No display
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Voltage at sensor for modulating piston movement with metering control at maximum stop
▪ 4.150 ... 4.720 V: OK
▪ If outside tolerance: Check contact resistance in wiring
Metering control in injection pump incorrectly set=> replace injection pump
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Voltage at sensor for modulating piston movement with metering control at minimum stop
▪ 0.500 ... 0.970 V: OK
▪ If outside tolerance: Check contact resistance in wiring => Page 23-80
Metering control in injection pump incorrectly set=> replace injection pump
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Display group 04 during idling (warm engine, coolant temperature not below +85 °C)
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Read measured value block 4
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◂ Indicated on display
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860 rpm
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0.9 °BTDC
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0.9 °BTDC
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23 %
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Duty cycle (actuation) of injection start valve
▪ no specification
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Current actual commencement of injection
▪ 2°ATDC -4°BDTC: OK
▪ later 2°ATDC: Injection timing control stuck
Injection start valve defective
Injection pump set at extremely retarded position
=> Check injection timing range, Page 23-56
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Injection start specified by control unit
▪ 2°ATDC -4°BDTC: OK
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Engine speed
▪ 780 ... 900 rpm OK
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Display group 04 at full throttle (test drive in 3rd or 4th gear, coolant temperature not below +85 °C)
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 4
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◂ Indicated on display
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4060 rpm
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16.3 °BTDC
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16.1 °BTDC
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84 %
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Duty cycle (actuation) of injection start valve
▪ No specification
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Current injection start
▪ As specified commencement of injection in display zone 2
▪ (tolerance ±2°): OK
▪ If outside tolerance: Injection pump delivery start incorrect
=> check injection start, Page 23-56
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Injection start specified by control unit
▪ 14 ... 18 °BTDC: OK
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Engine speed
▪ 3800 ... 4200 rpm: OK
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