5.3.3 Display group 3 - Exhaust gas recirculation
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
Engine speed
760...940 rpm
---
2
Intaken air mass (specified):
280...460 mg/stroke
---
3
Intaken air mass (actual):
4
Duty cycle of exhaust gas recirculation
valve
70...100 %
---
1)
The specification applies for deactivated exhaust gas recirculation system. (Duty cycle of exhaust gas recirculation valve in display
zone 4 at 100 %.
Evaluation: display group 3, display zone 3 - intaken air
mass (actual)
Display shows
Possible cause of fault
Fault remedy
Below specification
◆
Excessive exhaust gas recirculation
– Check exhaust gas recirculation sys-
◆
Unmetered air
– Check intake system for leaks
Above specification
◆
Engine too cold
– Run engine at increased speed to
warm up, and repeat test
◆
Insufficient exhaust gas recirculation
– Engine running for a long time at idling
speed, give burst on throttle
◆
Defective air mass meter -G70-
5.3.4 Display group 4 - Activation of injectors
-N30...N33-
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
Engine speed
760...940 rpm
---
2
Start of main injection activation
-5...5°CrS
3
Duration of main injection activation
350...700 ms
---
4
Pressure in high-pressure fuel system
(actual)
170...350 bar
---
Evaluation: display group 4, display zone 2 - start of main
injection activation:
Industriemotoren - Industrial Engines 2009
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Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
3
5 Measured value blocks, engine codes CJDA, CJDD
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