Recirculating Valve For Turbocharger -N249-5 Checking

Recirculating valve for turbocharger -N249-5 checking

Special tools and equipment





^ VAG1526A
^ VAG1527B
^ VAG1594A
^ VAG1598/31
^ VAS5051 with VAG5051/1

or

^ VAG1551 with VAG1551/3A

Note: The recirculating valve for turbocharger -N249and wire connections are monitored by the Engine Control Module (ECM).

^ Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word 01". Engine must run at idle for this

If a malfunction relating to the recirculating valve for turbocharger -N249- is displayed:
^ Disconnect hoses from valve; harness connector remains connected.
^ Attach assisting hose to one connection of valve.
^ Initiate output Diagnostic Test Mode (DTM) and activate the recirculating valve for turbocharger -N249-





Indicated on display
Valve must click...
...and must open and close (can be tested by blowing into assisting hose).

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

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

Checking internal resistance
^ Disconnect harness connector at valve.





^ Connect multimeter at valve for resistance measurement.
- Specified value: 27 - 30 Ohms

If specified value is not obtained:
^ Replace recirculating valve for turbocharger -N249-.

If the specified value is attained:
^ Check voltage supply

Checking voltage supply

Note: Voltage is supplied to the recirculation valve via the Fuel Pump (FP) relay.

Test requirement
^ Fuse for recirculation valve OK

^ Disconnect harness connector at valve.





^ Connect VAG1527B voltage tester as follows:





^ Operate starter briefly.
- LED must light.

If LED does not light:
^ Check wire connection from terminal 1 to Fuel Pump (FP) relay via fuse for an open circuit":
Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

^ Repair open circuit if necessary.

If wire connection is OK:
^ Check Fuel Pump (FP) relay

If LED lights:
^ Check activation:

Checking activation





^ Connect VAG1527B voltage tester to connector terminals 1 (B+) and 2.
^ Initiate output Diagnostic Test Mode (DTM) and activate the recirculating valve for turbocharger -N249-

- LED must blink.

If LED does not blink or if it remains constantly lit
^ Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM.





^ Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:





^ Repair open circuit or short circuit if necessary.

If wire connection is OK:
^ Replace Engine Control Module (ECM)