Volkswagen CJDA Workshop Manual page 407

2.2 Checking fuel pressure regulating valve
-N276-
Special tools and workshop equipment required
◆ K-Jetronic pressure tester -V.A.G 1318-
◆ Hand multimeter -V.A.G 1526- or multimeter -V.A.G 1715-
◆ Auxiliary measuring set -V.A.G 1594D-
◆ Test box -V.A.G 1598/42- with adapter cable
-V.A.G 1598/39-1-
◆ Current flow diagram
Test prerequisites
● Fuses must be OK.
● Coolant temperature at least 80°C
● The battery voltage must be at least 11.5 V.
● All electrical consumers must be switched off.
● Earth connections OK
Test procedure
– Start engine and run at idling speed.
– Connect vehicle diagnostic tester, and select engine control
⇒ P age 23
unit.
– Select diagnosis function "011-Read measured value block".
– Select "Display group 7".
Indicated on display:
Note
The display zones may be shown one below the other or next to
each other on the display of the vehicle diagnostic tester.
– Observe display zone 4. For the check below, the coolant
temperature must be at least 80°C.
– Check fuel rail pressure as follows:
– Select "Display group 20".
Indicated on display:
Note
The display zones may be shown one below the other or next to
each other on the display of the vehicle diagnostic tester.
– Observe display zones 2 and 3 for fuel rail pressure. In addi-
tion, observe 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
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
Industriemotoren - Industrial Engines 2009 ▶
Display group 7
xxx.x°C xxx.x°C
Display group 20
880 rpm xxxx bar
2 Checking components and functions
3
xxx.x°C 87.3°C
xxxx bar xxx.x%
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