Air Recirculation Valve For Turbocharger - N249, Testing

Special tools, testers and other equipment required





^ V.A G 1526 A
^ V.A G 1527 B
^ V.A G 1594 A
^ V.A G 1598/31
^ VAS 5051 with VAS 5051/1 or
^ V.A.G 1551 with V.A.G 1551/3 A

Notes: The air recirculation valve for turbocharger - N249 and its wiring are monitored by the engine control unit.

^ Connect vehicle diagnostic, testing and information system VAS 5051 (or scan tool V.A.G 1551) and select "Engine Electronics" control unit by entering address word 01. When doing this, the engine must be running at idling speed.
^ Check DTC memory of engine control unit.

If the display shows a malfunction relating to air recirculation valve for turbocharger - N249:
^ Disconnect hoses from valve but leave the electrical connector plugged in.
^ Fit an auxiliary hose to one of the connections on the valve.
^ Start output diagnostic test mode and activate air recirculation valve for turbocharger - N249.





Indicated on display
The valve should click and open and close (test by blowing into auxiliary hose).
If the valve does not click:
^ Test internal resistance of valve.

If the valve does not open and close properly:
^ Replace air recirculation valve for turbocharger - N249.

Testing internal resistance
^ Unplug connector from valve.





^ Connect multimeter to valve (resistance measurement range).
^ Specification: 27-30 52

If the specification is not attained:
^ Replace air recirculation valve for turbocharger - N249.

Charge air system with turbocharger
If the specification is attained:
^ Check voltage supply.

Checking voltage supply

Notes: The air recirculation valve receives its power supply via the fuel pump relay.

Test requirement
^ Fuse for air recirculation valve must be OK

^ Unplug connector from valve.





^ Connect voltage tester V.A.G 1527 B as follows:





^ Operate starter briefly.
^ The LED should light up.

If the LED does not light up:
^ Test for open circuit in wiring from contact 1 to fuel pump relay via fuse.
Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations binder, or equivalent.
^ Repair any open circuits.

If the wiring is OK:
^ Test fuel pump relay.

If the LED lights up:
^ Test activation.

Testing activation





^ Connect voltage tester V.A.G 1527 B to contact 1 (positive) and contact 2 of the connector.
^ Start output diagnostic test mode and activate air recirculation valve for turbocharger - N249.
^ The LED should flash.

If the LED lamp does not flash or lights up continuously:
^ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect the engine control unit itself.





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





^ Repair short circuit or open circuit if necessary.

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