Beetle L4-1.9L DSL Turbo (ALH) (1998)
Diesel Intake Air Shut-Off Valve: Testing and Inspection
With Manufacturer's Scan Tool
Change-Over Valve For Intake Manifold Flap -N239-, Checking
Special tools
-
VAG 1390 Hand vacuum pump
-
VAG 1598/22 Test Box (MY 1999)
-
VAG 1598/31 Test Box (from MY 2000)
-
Fluke 83 multimeter
-
VW 1594 Adapter kit
-
Wiring diagram
Function, checking
-
Start engine and let idle.
-
Switch OFF ignition.
-
Observe position of lever on intake manifold change-over flap (using 2nd technician)
-
Intake manifold change-over flap must (after switching OFF ignition) close back and after approx. 3 seconds re-open.
If change-over does not occur, perform following checks
-
Check intake manifold change-over flap mechanics for freedom of movement by manually operating the rods by hand.
-
Check vacuum function of positioning actuator using VAG 1390 hand vacuum pump.
-
Check vacuum lines for correct connection.
If mechanical components OK
-
Check Intake Manifold Change-over Valve -N239-.
Test sequence
-
Disconnect -N239- harness connector.