Test Procedure

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start diagnosis

-- Connect the scan tool.

-- Start engine and let idle.

-- Using the scan tool, Check the air flow quantity of the Mass Air Flow (MAF) Sensor -G70- at idle:

Diagnostic text		Specified value
Air flow quantity at Mass Air Flow (MAF) sensor		-
Engine running at idle		2.00 to 5.00 g/sec

-- Switch the ignition OFF.

If the specified value was obtained:

-- Condition may be intermittent

-- Check the intake duct for air leaks, loose connections.

-- Check the wiring for an open, high resistance or short to ground.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If the specified value was Not obtained:

-- Disconnect the Mass Air Flow (MAF) Sensor -G70- -1- electrical harness connector.

Fig 1: Identifying Mass Airflow Sensor -G70- Connector, Vacuum Line, Bolt And Clamp

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Switch the ignition On.

-- Using a Multimeter, Check the Mass Air Flow (MAF) Sensor -G70- electrical harness connector terminal 1 to 2 for voltage.

Specified value: Battery Voltage

-- Switch the ignition Off.

Continue test according to the following table:

Value	Cause	Test
If the specified value was not obtained:	Open or shorted circuit	Checking Wiring
If the specified value was obtained:	Check reference signal circuit	Checking Wiring