TT Quattro Coupe L4-1.8L Turbo (BEA) (2003)
Intercooler: Testing and Inspection
Charge Pressure Control Valve - N75, Testing
Special tools, testers and other equipment required
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V.A.G 1526 A
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V.A.G 1527 B
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V.A.G 1594 A
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V.A.G 1598/31
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VAS 5051 with VAS 5051/1
or
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V.A.G 1551 with V.A.G 1551/3 A
Notes: Charge pressure control valve - N75 and its wiring are monitored by the engine control unit.
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Connect vehicle diagnostic, testing and information system VAS 5051 (or scan tool V.A.G 1551) and select "Engine Electronics" control unit by
entering address word 01. When doing this, the engine must be running at idling speed.
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Check DTC memory of engine control unit.
If the display shows a malfunction relating to charge pressure control valve - N75:
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Disconnect hoses from valve but leave the electrical connector plugged in.
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Fit an auxiliary hose to one of the connections on the valve.
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Start output diagnostic test mode and activate charge pressure control valve - N75.
Indicated on display
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The valve should click and open and close (test by blowing into auxiliary hose).
If the valve does not click:
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Test internal resistance of valve.