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Injector-pump unit valves: testing > < Test the functioning

Leon Mk2

Test process
Test process
–  Remove the connector from the intake manifold flap switch-over valve -N239- Location of components, → Chapter
   
–  Measure the resistance between the contacts of the switch-over valve: Target value: 25...45 Ω
If the target value is not reached:
–  Replace the intake manifold flap switch-over valve.
If the target value is reached:
  N23-0016
–  Change the multimeter to voltage measurement and connect it at contacts 1 + 2 of the detached connector of the intake manifold flap switch-over valve.
–  Start the engine and run it at idling revs. Target value: battery voltage
–  Switch off the ignition.
–  After roughly three seconds the voltage value should fall to 0 V.
If the voltage value does not vary as described:
  V96-0749
–  Attach the test box -V.A.G. 1598/31- to the wiring harness of the control unit.
  E23-0032
–  Test for open circuits in the wiring between the test box and the connector, following the wiring diagram. Contact 1 + female contacts 1 and 2 Contact 2 + female contact 81 Wiring resistance: 1.5 Ω max.
–  Also test for short circuits between wires, to vehicle earth and to positive battery. Target value: ∞ Ω
If no fault is found in the wiring:
–  Replace the direct diesel injection system control unit -J248- → Anchor.
  V96-0749

Injector-pump unit valves: testing > < Test the functioning