000175 / P000175

000175 / P00AF - Alternator Module for Turbocharger 1: Stuck

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Possible Symptoms

• Malfunction Indicator Light (MIL) on

• Glow plug light flashing

• Reduced engine performance

Possible Causes

• Defective N75

• N75 connector plugged into the wrong two wire component. Refer to wiring diagram to verify

• Vacuum leak or low vacuum

• VNT sticking or seized

• G581 sensor

Possible Solutions

• Verify N75 is working to design, use output testing

• Verify the N75 connector plugged into N75 per the factory level wiring diagram rather than any other component that may not set a fault code such as N79 (Positive Crankcase Ventilation (PCV) heating element)

• Verify vacuum lines are good, check engine vacuum at idle

• Test VNT and G581, apply vacuum to VNT and watch MVB 120.4

• Engine off, no vacuum 120.4 should read about 3.5V

• Engine Off, apply 17 Inches of mercury, 120.4 should drop to about .7V

• Engine at idle, 120.4 should read about .7V

• If 120.4 voltage does not alter, VNT may be seized or G581 failed

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Special Notice

• On some TDI engines, the vacuum diaphragm / G581 unit can be purchased as a separate part from dealer.

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