Jetta Wagon L4-1.8L Turbo (AWP) (2005)
If the specification is not obtained:
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Check signal and Ground (GND) wires for Mass Air Flow (MAF) sensor.
If the specification is obtained:
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Press -> key.
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Press keys 0 and 6 for "End output" function and confirm input with Q key.
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Switch ignition off.
Checking voltage supply for Mass Air Flow (MAF) sensor
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Disconnect 5-pin connector -1- from Mass Air Flow (MAF) sensor -2-.
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Connect multimeter to measure voltage on connector contact 2 and engine Ground (GND).
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Start engine and run at idling speed.
Specification: 11 to 15 V
If no voltage is present:
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Switch ignition off.
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Check wiring from contact 2 to fuel pump (FP) relay -J17- according to wiring diagram.
If the voltage supply and wiring is OK:
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Switch ignition on.
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Connect multimeter to measure voltage on connector contact 4 and engine Ground (GND):
Specification: 4.5 to 5.5 V
If no voltage is present:
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Switch ignition off.
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Check signal and Ground (GND) wires.
Testing signal and Ground (GND) wires for Mass Air Flow (MAF) sensor
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Connect V.A.G1598/31 test box to control module wiring harness. The engine control module remains disconnected.