Jetta Sedan L5-2.5L (CBTA) (2009)
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Start the engine and let it run at idle.
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Using a multimeter, check the Mass Air Flow (MAF) Sensor (G70) electrical harness connector terminal 2 to engine Ground (GND).
Specified value: battery voltage.
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Switch the ignition off.
If specified value was not obtained:
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Remove the fuse 1 in Fuse box C. Check the Mass Air Flow (MAF) Sensor (G70) electrical harness connector terminal 3 to Fuse 1 in Fuse box C
for an open circuit, high resistance or a short to ground.
Specified value: 1.5 ohms max.
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Repair the harness and replace the fuse as necessary.
If no malfunction is detected in the wiring and if the voltage supply was OK:
Checking electrical circuit
If the manufacturers test box is being used, perform the following step.
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Install the test box.
If the manufacturers test box is not being used, perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .