Volkswagen CPYC - Display Group 3 - Exhaust Gas Recirculation

Display shows Possible cause of fault Fault remedy
◆ Shortage of fuel
◆ Air in fuel system
– Check fuel supply system
⇒ Page 298, removing and installing
parts of fuel supply system
– Bleeding fuel system ⇒ Page 383.
◆ Injectors for cylinders 1…4
-N30...N33- defective
– -N30...N33- Check. ⇒ Page 398
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
full load ⇒ Page 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
zone
Operating mode or component Specification Evaluation
1 Engine speed 2200...2800 rpm ---
2 Intaken air mass (specified): 620...830 mg/stroke ---
3 Intaken air mass (actual): Approx. intaken air
mass (specified)
⇒ Page 113
4 Duty cycle of exhaust gas recirculation
valve
65...80 % ---
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-
tem ⇒ Page 436
◆ Unmetered air
– Check intake system for leaks
Above specification
◆ Engine too cold
– Warm up engine, and repeat test
◆ Insufficient exhaust gas recirculation
– Give burst on throttle
◆ Defective air mass meter -G70-
– -G70- Check. ⇒ Page 411
Evaluation: display group 3, display zone 4 - duty cycle of
exhaust gas recirculation valve
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
3
6 Measured value blocks, engine codes CPYA, CPYB, CPYC, CPYD, CPYE, CPYF, CPYG
127