Recirculating Valve For Turbocharger N249 , Checking

Recirculating Valve For Turbocharger N249, Checking







Special tools, testers and auxiliary items required
- Multimeter VAG1526A or equivalent
- Voltage tester VAG1527B
- Connector test set VAG1594A
- Adapter VAG1598/31
- Vehicle Diagnostic, Testing and Information System VAS5051 VAS5051 with VAS5051/1
or
- Scan Tool VAG1551 with VAG1551/3A

Requirement
- Vehicle Diagnostic, Testing and Information System VAS5051 or Scan Tool VAG1551 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 .

Indicated on display:

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

- 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 VAG1527B as follows:

Connector contact Measure to
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 VAG1527B 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 VAG1598/31 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 contact Test box VAG1598/31 socket
2 105

- If necessary, eliminate open circuit/short circuit.

If wiring is OK:
- Replace engine control module.