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Test fuel pressure regulator and holding pressure > < Testing components and functions

Octavia Mk1

Idle testing
Idle testing
Special tools and workshop equipment required
t  Vehicle system tester -V.A.G 1552 - with cable -V.A.G 1551/3-
Test conditions
l  Exhaust system shut.
l  Coolant temperature minimum 80°C
l  Throttle valve in idling speed position → 1.6 ltr./74 kW Engine, Mechanics → Rep. Gr.20
l  Electrical consumers must be disconnected (the radiator cooling fan must be off during this test)
l  AC switched off
l  Selector lever in P or N (only on automatic gearbox)
Testing idling speed
  Note
t  The idling speed cannot be adjusted.
t  The idling speed is controlled by the engine control unit via the throttle valve control unit.
–  Interrogate the fault memory → Chapter. There must not be any fault stored, if necessary rectify any fault, erase fault memory, switch off engine and start again, conduct test drive and interrogate the fault memory again for inspection.
–  Keep running engine at idling speed.
–  Subsequently switch off engine.
–  Switch off the rear window heater.
–  Put selector lever in P or N (vehicles with automatic gearbox).
–  Select 08 for the function read measured value block and display group number 001 → Chapter.
   
The following appears in the display:
–  Read off idling speed in display field 1.
Specified value: → Chapter; display group 000.
–  Press → key.
–  Enter 06 for the function “End output” and confirm with key Q.
–  If the specified value is not achieved, interrogate once again the fault memory → Chapter.
If the idling speed is too high or too low and if there is no fault in the fault memory, perform the following inspections:
l  Check idling switch → Chapter or → Chapter.
l  Large quantity of unmetered air → Chapter, display group 003, 008 or 099.
l  Inspecting throttle valve control unit → Chapter.
  
Reading measured value block 1                      ->
850/rpm    90°C   0.80 V   00000010

Test fuel pressure regulator and holding pressure > < Testing components and functions