Recirculating Valve For turbocharger -N249-, Testing

Recirculating Valve For Turbocharger -N249-, Testing







Special tools, testers and other equipment required
- V.A.G 1526A
- V.A.G1527B
- V.A.G 1594 A
- V.A.G 1598/31
- VAS5051 with VAS 5051/1
-or
- V.A.G 1551 with V.A.G 1551/3 A

NOTE: Recirculating valve for turbocharger -N249- and its wiring are monitored by the engine control module.

- Connect vehicle diagnostic, testing and information system VAS 5051 (or fault reader V.A.G 1551) and select engine electronics control module by entering "Address word" 01. When doing this the engine must be running at idling speed.

- Interrogate DTC memory of engine control module.

If the display shows a DTC retaining to Recirculating valve for turbocharger -N249-:
- Disconnect hoses from valve but leave the electrical connector plugged in.
- Install 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:
Output Diagnostic Test Mode ->
Air recirculation valve for turbocharger -N249-

The valve should click...
...and should open and close (test by blowing into auxiliary hose).

Valve does not click:
- Test internal resistance of valve.

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

Testing internal resistance

- Disconnect connector from valve.







- Connect multimeter to valve (resistance measurement range).

- Specification: 27-30 Ohms

If the specification is not attained:
- Replace Recirculating valve for turbocharger -N249-.

If the specification is attained:
- Check voltage supply.

Checking voltage supply

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

Test requirement:

- Fuse for air recirculation valve must be OK.

- Disconnect connector from valve.







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

Connector Contact Measure against
1 Engine Ground (GND)

- 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.

- Rectify any open circuits.

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

If the LED lights up:
- Test activation.

Checking 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 module. Do not connect the engine control module itself.







- Test for open circuit and short to positive or Ground in the following wiring connections:

Connector Contact Test box V.A.G 1598/31 Contact
2 105

- Rectify short circuit or open circuit if necessary.

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