Display Group 3 - Exhaust Gas Recirculation - Volkswagen CJDA Workshop Manual

Display shows Possible cause of fault
◆ Shortage of fuel
◆ Air in fuel system
◆ Injectors for cylinders 1...4

6.4.3 Display group 3 - Exhaust gas recirculation

Note
◆ To perform the test increase engine speed from 1500 rpm to
full throttle at full load. Note conditions for measurements at
⇒ P age
full load 125.
◆ The measured values must be read at an engine speed of
2500 rpm (2nd person required).
Test prerequisites
● Engine warm, coolant temperature not below 80°C
● Engine speed 2200...2800 rpm
● Engine at full load
Display Operating mode or component
zone
1 Engine speed
2 Intaken air mass (specified):
3 Intaken air mass (actual):
4 Duty cycle of exhaust gas recirculation
valve
Evaluation: display group 3, display zone 3 - intaken air
mass (actual)
Display shows Possible cause of fault
Below specification
◆ Excessive exhaust gas recirculation
◆ Unmetered air
Above specification
◆ Engine too cold
◆ Insufficient exhaust gas recirculation
◆ Defective air mass meter -G70-
Evaluation: display group 3, display zone 4 - duty cycle of
exhaust gas recirculation valve
6 Measured value blocks, engine codes CPYA, CPYB, CPYC, CPYD, CPYE, CPYF, CPYG
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
-N30...N33- defective
Industriemotoren - Industrial Engines 2009 ▶
Fault remedy
– Check fuel supply system
⇒ P age
298, removing and installing
parts of fuel supply system
– Bleeding fuel system
– -N30...N33- Check.
Specification
2200...2800 rpm
620...830 mg/stroke
Approx. intaken air
mass (specified)
65...80 %
Fault remedy
– Check exhaust gas recirculation sys-
⇒ P age 436
tem
– Check intake system for leaks
– Warm up engine, and repeat test
– Give burst on throttle
– -G70- Check.
3
⇒ P age
383.
⇒ P age 398
Evaluation
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⇒ P age 113
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⇒ P age 411
127