000175 / P000175
000175 / P00AF - Alternator Module for Turbocharger 1: Stuck
Possible Symptoms
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Malfunction Indicator Light (MIL) on
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Glow plug light flashing
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Reduced engine performance
Possible Causes
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Defective N75
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N75 connector plugged into the wrong two wire component. Refer to wiring diagram to verify
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Vacuum leak or low vacuum
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VNT sticking or seized
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G581 sensor
Possible Solutions
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Verify N75 is working to design, use output testing
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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)
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Verify vacuum lines are good, check engine vacuum at idle
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Test VNT and G581, apply vacuum to VNT and watch MVB 120.4
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Engine off, no vacuum 120.4 should read about 3.5V
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Engine Off, apply 17 Inches of mercury, 120.4 should drop to about .7V
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Engine at idle, 120.4 should read about .7V
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If 120.4 voltage does not alter, VNT may be seized or G581 failed
Special Notice
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On some TDI engines, the vacuum diaphragm / G581 unit can be purchased as a separate part from dealer.
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