Passat GLS Wagon L4-1.8L Turbo (AUG) (2001)
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Apply parking brake.
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Select the backward arrow on navigation bar.
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Input "003" on keypad to select "Display group 003".
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Select "Q" button to confirm.
Tip: RPM, Air mass, throttle valve angle and the Advance angle are displayed.
If Channel 2 indicates 0.0 g/s, then the MAF -G70- or it's wiring are faulty:
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Gently wiggle connector.
If value changes erratically, Connection is bad:
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Repair connection.
If Channel 3 value (throttle valve angle) is at 2% or higher:
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Clean throttle valve control module -J338- (see cleaning instructions below) thoroughly and readapt.
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Inspect crankcase ventilation system hoses.
If sludge or oil deposits are found inside hoses:
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Clean inside of hoses as necessary.
On all models:
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Remove suction jet pump for brake booster.
Tip: Suction jet pump shown is equipped on Jetta (radiator support at bottom of photo).
Tip: Suction jet pump shown is equipped on Passat.
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Inspect suction jet pump for blockage.
If blocked:
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Replace suction jet pump.
Continued for ALL vehicles:
Throttle valve control module -J338-, Cleaning instructions:
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Remove intake air hose from throttle valve control module.
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Inspect interior surface of throttle valve control module and throttle plate for dirt / oil film.
If interior of throttle valve control module is not dirty:
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Reinstall intake air hose.
Continue with diagnosis, (see appropriate Repair Manual group in ElsaWeb or VAS 5051/5052 Guided Fault Finding).
If interior of throttle valve control module is dirty / oily:
Tip: DO NOT replace throttle valve control module for this condition. Over a long period of time it is possible that dirt can accumulate on the inner
surfaces.