GTI V6-2.8L (BDF) (2002)
Variable Induction Control Valve: Testing and Inspection
With Manufacturer's Scan Tool
Intake Manifold Change-Over Valve -N156-, Checking
The check need only be carried out when performance is poor.
The change-over from long to short intake channels occurs at approx. 4400 rpm.
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
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VAG 1551 Scan tool (or VAG 1552) with VAG 1551/3 adapter cable
NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the VAS 5051.
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VAG 1390 Hand vacuum pump
Checking function
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Start engine and run at idle speed.
The actuator (vacuum unit) on the intake manifold holds the change-over barrel in position for long intake channel.
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Have a second person press accelerator pedal down fully onto limit stop (throttle burst). Observe vacuum unit for Intake Manifold Change-Over
Valve -N156- (location: on left of intake manifold). The actuating element must rotate the barrel in the intake manifold (arrow).
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Switch off ignition.
If the actuating element does not perform the change-over sequence:
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First check the activation of the Intake Manifold Change-Over Valve -N156- via Output Diagnosis Test Mode (DTM)
See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Output Diagnostic Test Mode (DTM) (Function 03).
If activation is OK.:
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Connect scan tool.