With Manufacturer's Scan Tool

Recirculating Valve For Turbocharger -N249-, Checking







Special tools and equipment
- VAG 1526 A Multimeter or equivalent
- VAG 1527 B Voltage tester
- VAG 1594 A Connector test set
- VAG 1598/31 Adapter
- VAS 5051 Vehicle Diagnostic, Testing and Information System VAS 5051 with VAS 5051/1
or
- VAG 1551 Scan Tool with VAG 1551/3 A

Requirement
- Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551 Scan Tool must be connected.

Work sequence

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

- Read DTC memory of engine control module.

If display shows a DTC relating to Recirculating valve for turbocharger -N249-:







- Disconnect hoses from Recirculating valve for turbocharger -N249- -1-; leave electrical connector connected.

- Location: under intake manifold

NOTE: The illustration shows a removed intake manifold viewed from below.







- Connect test hose to valve connection marked with arrow.
- Start Output Diagnostic Test Mode and actuate Recirculating valve for turbocharger -N249-.

Output Diagnostic Test Mode ->
Recirculating valve for turbocharger -N249

Indicated on display
- Valve must click...
- ...and must open and close (can be checked by blowing into test hose).

If valve does not click:
- Check internal resistance of valve.

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

Checking internal resistance







- Disconnect connector from Recirculating valve for turbocharger -N249- -1-.







- Connect multimeter and measure resistance at valve.

Specification: 27... 30 Ohms

If reading does not match specification:
- Replace Recirculating valve for turbocharger -N249-.

If measured value matches specification:
- Check power supply.

Checking power supply

NOTE: The recirculating valve is supplied with power via the fuel pump relay.

Requirements
- Fuse for recirculating valve OK
- Fuel pump relay OK
- Disconnect connector at valve.







- Connect voltage tester VAG 1527 B as follows:

Connector Measure to
to contact
1 Engine Ground

- Briefly operate starter.
- LED must light up

If LED does not light up:
- Check for open circuit in wiring from contact 1 of connector through fuse to fuel pump relay:

- If necessary, eliminate open circuit.

If LED lights up:
- Check actuation.

Checking actuation







- Connect voltage tester VAG 1527 B to contact 1 (positive) and 2 of connector.
- Start Output Diagnostic Test Mode and actuate Recirculating valve for turbocharger -N249-.
- LED must flash

If LED does not flash or if it is permanently lit:
- Connect test box VAG 1598/31 to engine control module wiring harness. Engine control module must not be connected.







- Check for open circuit and short to Ground/positive in the following wiring connection:

Connector Test box VAG 1598/31
contact socket
2 105

- If necessary, eliminate open circuit/short circuit.

If wiring is OK:
- Replace engine control module.