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Checking for internal leaks > < Checking tandem pump

Golf Mk5

Checking delivery pressure
Checking delivery pressure
Special tools and workshop equipment required
   
t  Tandem pump tester -VAS 5187-
  W00-0997
t  Torque wrench (5...50 Nm) -V.A.G 1331-
t  Vehicle diagnosis, testing and information system -VAS 5051-
t  Diagnosis cable -VAS 5051/6A-
Test prerequisites
Coolant temperature must be at least 85 °C.
Unit injectors OK.
Fuel filter and fuel lines must not be blocked.
Procedure
–  Remove engine cover. → Fig.
  W00-0427
–  Remove plug -arrow-.
  N20-0288
–  Connect tandem pump tester -VAS 5187- as shown.
–  Start engine and run at idling speed.
–  Connect vehicle diagnosis, testing and information system -VAS 5051- and select operating mode “Vehicle self-diagnosis”.
–  Press button “01 - Engine electronics” on display.
–  Press diagnosis function “08-Read measured value block”.
–  Enter display group “1” using number block (key pad) and confirm entry with Q key.
–  Read engine idling speed in display zone “1”.
–  Increase engine speed to 4000 rpm.
–  Observe pressure indicated on pressure gauge.
Specification: min. 7.5 bar
If the specification is not obtained
–  Using a hose clamp, clamp off return line between fuel filter and tandem pump.
–  Increase engine speed to 4000 rpm.
–  Observe pressure indicated on pressure gauge.
Specification: min. 7.5 bar
If specification is now obtained
Pressure loss at unit injectors.
–  Renew unit injector O-rings.
If the specification is not obtained
–  Renew tandem pump. → Chapter
  Note
After removing pressure tester, tighten plug to 25 Nm. Always replace seal.
  N20-0359

Checking for internal leaks > < Checking tandem pump