Recirculating Valve For Turbocharger -N249- Checking

Recirculating valve for turbocharger -N249- checking
Special tools and equipment





^ VAG 1526 A
^ VAG 1527 B
^ VAG 1594 A
^ VAG 1598/31
^ VAS 5051 with VAS 5051/1

or

^ V.A.G 1551 with V.A.G 1551/3 A

Test requirements:
^ Vehicle diagnostic, testing and information system VAS 5051 or VAG 1551 Scan Tool connected.

Test sequence

Note: The recirculating valve for turbocharger -N249and the wiring connections are monitored by the engine control module.

^ Read Diagnostic Trouble Code (DTC) memory of engine control module.

If a DTC relating to the recirculating valve for turbocharger -N249- is displayed:





^ Remove hoses of recirculating valve for turbocharger -N249- (-1-). The electrical connector remains plugged in.
- Location: below intake pipe

Note: The illustration shows bottom view of removed intake pipe.





^ Connect auxiliary hose to valve connector marked with an arrow.
^ Initiate output Diagnostic Test Mode (DTM) and activate recirculating valve for turbocharger -N249-.





Display:
^ The valve should click...
^ ...and must open and close (check by blowing into the auxiliary hose).

If the injector does not click:
^ Check internal resistance of valve.

If valve does not open or close properly-
^ Replace recirculation valve for turbocharger -N249-.





Checking internal resistance
^ Disconnect connector from recirculation valve for turbocharger -N249- (-1 -).





^ Connect multimeter to injector to measure resistance.
- Specified value: 27 to 30 Ohms

If specified value is not attained:
- Replace recirculating valve for turbocharger -N249-.

If specified value is attained:
- Check power supply.

Checking power supply

Note: The power supply for the recirculating valve I's via the fuel pump relay.

Test requirements:
^ Fuse for recirculating valve OK
^ Fuel pump relay OK
^ Disconnect wiring connector from valve.





^ Connect voltage tester VAG 1527 B as follows:





^ Operate starter briefly.
- The LED must light up.

If the LED does not light up:
^ Check wiring from contact 1 on connector via fuse to fuel pump relay for an open circuit:
^ Repair open circuit, if necessary.

If the LED lights up:
^ Check actuation.





Checking actuation
^ Connect voltage tester VAG 1527 B to contacts 1 (positive) and 2 of connector.
^ Initiate output Diagnostic Test Mode (DTM) and activate recirculating valve for turbocharger -N249-.
- The LED must flash.

If the LED lamp does not flash or if it lights up continuously:
^ Connect VAG 1598/31 test box to wiring harness leading to engine control module; engine control module should not be connected:





^ Check for open circuit and short to positive or Ground in the wiring connection:





^ Repair any open/short circuit as necessary.

If the wiring is OK:
^ Replace engine control module.