Volkswagen CJDA Workshop Manual page 411

– Apply several throttle bursts, and observe display zones 2
and 3 for fuel rail pressure at idling speed. In addition, ob-
serve duty cycle in display zone 4.
The fuel rail pressure specification in display zone 2 and the ac-
tual fuel rail pressure in display zone 3 should be roughly within
the same range, but they should not always be the same. The
difference between the pressure in display zone 2 and display
zone 3 must not exceed 40 bar.
Engine codes CJDA, CJDD
● Display zone 2, pressure in high pressure fuel system
(specified): 170... 350 bar.
● Display zone 3, pressure in high pressure fuel system (ac-
tual): 170... 350 bar.
● Display zone 4, duty cycle (specified): 15... 30 %
Engine codes CPYA, CPYB, CPYC, CPYD, CPYE
● Display zone 2, pressure in high pressure fuel system
(specified): 320... 780 bar.
● Display zone 3, pressure in high pressure fuel system (ac-
tual): 320... 780 bar.
● Display zone 4, duty cycle (specified): 25... 42 %
Continuation for all engine codes
If the specified values in display zones 2 and 3 are roughly with-
in the same range, and if the pressure difference does not ex-
ceed 40 bar:
No fault was detected.
– Then, read event memory of engine control unit, and clear
event memory if necessary
If the specified values in display zones 2 and 3 were always the
same, or if the pressure difference did exceed 40 bar:
⇒ P age
– Check wiring
Check fuel pressure while the engine is started.
WARNING
◆ Wrap a clean cloth around the connection before
opening the fuel system. Then release pressure by
carefully pulling hose off connection.
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
⇒ P age
26, read event memory.
398.
Industriemotoren - Industrial Engines 2009 ▶
2 Checking components and functions
3
395