Jetta Sedan L5-2.5L (BGP) (2005)
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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 Ground (GND).
Specified value: battery voltage.
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Switch the ignition off.
If specified value was not obtained:
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Check the Mass Air Flow (MAF) Sensor (G70) electrical harness connector terminal 2 to the Fuel Pump (FP) Relay (J17) socket 2/87 for an open
circuit or short to Ground (GND).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and the voltage supply is OK:
Checking electrical circuit
If the manufacturers test box is being used. Perform the following step.
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Install the Adapter Cable (121-pin) (VAG1598/31)24 Removal and Installation.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Motronic Engine Control Module (ECM) (J220). Refer to --> [ Engine Control Module, Replacing ] .