5.3.9 Display group 13 - Smooth running control
1
Test prerequisites
● Engine running at idling speed.
● Engine warm, coolant temperature not below 80°C.
● Intake air temperature < 40°C.
Display
zone
Operating mode or component Specification Evaluation
1 Injection quantity for smooth running con-
trol through injector, cylinder 1 -N30-
-2.80...2.80 mg/stroke
⇒ Page 101
2 Injection quantity for smooth running con-
trol through injector, cylinder 2 -N31-
-2.80...2.80 mg/stroke
⇒ Page 101
3 Injection quantity for smooth running con-
trol through injector, cylinder 3 -N32-
-2.80...2.80 mg/stroke
⇒ Page 101
4 Injection quantity for smooth running con-
trol through injector, cylinder 4 -N33-
-2.80...2.80 mg/stroke
⇒ Page 101
Evaluation: display group 13, display zones 1…4 - idling
speed smooth running control
◆ The injection system provides idling speed smooth running
control. There may be differences in performance between
the individual cylinders (component tolerances, jet flow rate,
compressions, etc.) which are recognised and compensated
for by selective injection quantities.
◆ Recognition at idling speed is via the signal from the engine
speed sender. If the signals are delivered at the same
rhythm then all cylinders work the same. If one cylinder is
weaker then the crankshaft takes longer for the next half rev-
olution. Conversely a more powerful cylinder will accelerate
the crankshaft so that less time is needed for the half revolu-
tion.
◆ If the engine control unit recognises a difference, then the
relevant cylinder is immediately given more or less fuel, until
the engine runs “smoothly” again.
◆ +... mg/stroke: The respective cylinder is less powerful and
is therefore supplied with more fuel.
◆ -... mg/stroke: The respective cylinder is more powerful and
is therefore supplied with less fuel.
5.3.10 Display group 20 - Fuel rail values 3
Test prerequisites
● Engine running at idling speed.
● Engine warm, coolant temperature not below 80°C.
● Intake air temperature < 40°C.
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
3
5 Measured value blocks, engine codes CJDA, CJDD
101
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