Recirculation Valve For Turbocharger - N249-, Checking

Recirculation 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
^ VAG 1551 with VAG 1551/3 A

Test requirement:
^ Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551 Scan Tool must be connected.

Test sequence

Note: Recirculation valve for turbocharger -N249- and its wiring are monitored by engine control module.

^ Read DTC memory of engine control module.
If display shows a DTC relating to recirculation valve for turbocharger -N249:





^ Disconnect hoses from recirculation valve for turbocharger -N249- -1-; leave electrical connector plugged in.
^ Fitting location: under intake manifold

Note: Illustration shows removed intake manifold viewed from below.





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





Checking internal resistance
^ Unplug connector on recirculation valve for turbocharger -N249- -1-.





^ Connect multimeter and measure resistance at valve.
^ Specification: 27. 30 Ohm
If reading does not match specification:
^ Replace recirculation valve for turbocharger -N249-.
If measured value matches specification:
^ Check power supply.

Checking power supply

Note: Air recirculation valve is supplied with power via fuel pump relay.

Test requirements:
^ Fuse for air recirculation valve OK
^ Fuel pump relay OK
^ Unplug connector at valve.








^ Connect voltage tester VAG 1527 B as follows:
^ 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:
Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations
^ 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 recirculation 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:
^ If necessary, eliminate open circuit/short circuit.
If wiring is OK:
^ Replace engine control module.