Jetta GL L4-1.9L DSL Turbo (ALH) (2001)
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Observe display in display field 1.
Specification: 230 to 370 mg/H
If the specification is not obtained:
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Check exhaust gas recirculation system:
If the specification is obtained:
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Road test vehicle with a 2nd technician to observe display.
Observe valid safety precautions when road testing See: Service Precautions/Technician Safety Information
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Accelerate vehicle in 3rd gear (vehicles with manual transmission) or 2nd gear (vehicles with automatic transmission) from about 1500 rpm using
wide open throttle.
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Press PRINT button on V.A.G 1551 at approx. 3000 rpm.
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Specification in display field 4: 100% (accelerator pedal position)
Read measured value block 10
->
830 mg/H
1027 mbar
1850 mbar
100%
If the specification is not obtained:
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Repeat test and accelerate vehicle at wide open throttle.
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Specification in display field 1: above 800 mg/H (mass of air drawn in).
Read measured value block 10
->
830 mg/H
1027 mbar
1850 mbar
100%
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Press -> button.
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Press buttons -0- and -6- to select "End output" function 06 and confirm entry with -Q- button.
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Switch ignition off.
If the specification is not obtained:
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Replace MAF Sensor -G70-
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Check DTC memory and, if necessary, repair any malfunctions and then erase, See: Testing and Inspection
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Read readiness code.
If the DTC memory has been erased or the engine control module was disconnected from permanent battery positive (B+), the readiness code must be
generated again.
If a constant 550 mg/H (predetermined replacement value) is displayed in field 1:
Testing power supply to MAF sensor
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Disconnect 5-pin connector for MAF sensor (arrow).
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Switch ignition on.