Jetta GLS L4-1.9L DSL Turbo (ALH) (2001)
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Inspect ECM ground (GND) connection for corrosion, poor or no connection.
2.
Injection pump timing, checking
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Check start of injection pump timing (see Repair Group: Diesel direct injection system, servicing)
Tip:
An adjustment to the upper range is advised.
3.
Snow screen (if applicable) at intake air duct, checking
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Check snow screen, located below left front fender in air duct -3-, and clean as necessary.
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Inspect air cleaner element -1- for proper installation.
If air cleaner element is deformed due to improper installation, this may
cause the MAF sensor to fail.
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Replace air cleaner element as necessary.
4.
Vacuum hoses
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Check integrity of all vacuum hoses and connections, and repair as needed.
5.
EGR valve and intake manifold air flap (integrated in EGR valve), checking
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Remove intake hose -1- at EGR valve.
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Remove vacuum hose from EGR valve -2-.
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Connect hand vacuum pump to EGR valve -2-. See --> Required
Parts and Tools.