Volkswagen CJDA Workshop Manual page 413

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.
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.
– Check fuel system for leaks
If no fault was found:
– Renew fuel pressure sender -G247-.
If the fault persists:
– Renew high-pressure pump
– 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:
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– Check wiring
Checking fuel pressure while the engine is started
– Have a second person start the engine, and observe pres-
sure tester while the engine is started.
– While doing this, close shut-off tap of pressure tester slowly
and carefully until a pressure of max. 8 bar is displayed.
– Switch off ignition.
If specification has been attained:
Fuel supply to high-pressure pump is OK.
– Renew fuel pressure sender -G247-.
– Then, read event memory of engine control unit, and clear
event memory if necessary
If the fault persists:
– Renew fuel pressure regulating valve -N276-.
– Then, read event memory of engine control unit, and clear
event memory if necessary
If the fault persists:
– Renew fuel metering valve -N290-.
– Then, read event memory of engine control unit, and clear
event memory if necessary
If the fault persists:
– Renew high-pressure pump.
If the specification has not been attained:
– Check fuel lines, e.g. for kinks, and check whether fuel filter
is clogged.
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
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384.
⇒ P age
380.
⇒ P age
26, read event memory.
398.
⇒ P age
26, read event memory.
⇒ P age
26, read event memory.
⇒ P age
26, read event memory.
Industriemotoren - Industrial Engines 2009 ▶
2 Checking components and functions
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