Jetta GL L4-1.9L DSL Turbo (ALH) (2001)
Display will appear as shown
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Accelerate vehicle in 3rd gear from about 1500 rpm to wide open throttle.
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Press VAG 1551 PRINT button at approx. 3000 rpm.
Read measuring value block 11
Specification: 1700 to 2200 mbar (in display field 3)
If specification was obtained:
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Press button.
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Press buttons -0- and -6- to select "End output" function 06.
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Press -Q- button to enter input
If specification was not obtained:
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Perform Output Diagnostic Test Mode (function 03) to activate the Wastegate Bypass Regulator Valve -N75-.
Display will appear as shown
The valve must function and the boost pressure control rod must move back and forth (at least 3 to 4 times), as long as there is a vacuum in the
vacuum reservoir.
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Press button.
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Press buttons -0- and -6- to select "End output" function 06.
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Switch ignition off.
If the boost pressure control rod does not move and the specifications are not obtained, replace the turbocharger.
If the rod does not move because Wastegate Bypass Regulator valve -N75- is not working:
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Check Wastegate Bypass Regulator valve -N75-.
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Check vacuum hoses.