Jetta SportWagen L4-2.0L DSL Turbo (CBEA) (2009)
If the specified value was Not obtained:
Checking voltage supply
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Disconnect the Mass Air Flow (MAF) Sensor (G70) electrical harness connector.
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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 5 to engine Ground for voltage.
Specified value: battery voltage.
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Switch the ignition OFF.
If the specified value was Not obtained:
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Remove fuse 1 in Fuse Panel C. Check the Mass Air Flow (MAF) Sensor (G70) electrical harness connector terminal 5 to Fuse 1 in Fuse Panel C
for an open circuit, high resistance or short to ground.
Specified value: 1.5 ohms max.
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If necessary, repair the faulty wiring connection.
If the specified value was obtained:
Checking electrical circuit
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Start the engine and let it run at idle.
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Using a multimeter, connect black lead to ground and red lead to terminal 1, 2 and 4 of the MAF connector and check for voltage using the chart
below.
Specified values:
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Switch the ignition OFF.
If the specified value was Not obtained:
Checking wiring
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).
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Using a multimeter, check the Mass Air Flow (MAF) Sensor (G70) electrical harness connector terminals to the Motronic Engine Control Module
(ECM) (J623) electrical harness connector T94 terminals for an open circuit.