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– Connect Auxiliary pump tester -VAS 5187- , as shown.
– Start engine and run at idle speed.
– Connect the Diagnosis, Measurement and Information Sys‐
tem -VAS 5051A/52- and select the operation mode
Vehicle
self-diagnosis
. Then, select engine electronic control unit
with
01 Engine electronic system
.
– Select function
08 Read value block
.
– Select screen “2” via numeric keys (on keyboard) and confirm
with
Q
key.
– Read engine idle speed on field 1.
– Increase engine speed to 1,500 rpm.
– Check pressure on the pressure gauge. Specification: at least
3.5 bar.
– Press the
←
key.
– Select function
06 End the test
function key.
– Switch off ignition.
If the specification is not obtained:
– Replace auxiliary pump
⇒ page 97
.
Note
After removing pressure gauge unit, tighten plug at 25 Nm. Al‐
ways replace seal.
Fox 2004 ➤
3 - Cyl. diesel engine - Edition 02.2009
96
Rep. Gr.20 - Supply system - Fuel tank, fuel pump
