Removal & Installation
All Except Passat 2.0L
- Turn the ignition switch to the OFF position.
- Disconnect the Intake Air Temperature sensor harness electrical connector.
- Using a suitable tool, remove Intake Air Temperature sensor.
- Installation is in reverse order of removal.
1.8L, 2.7L, 2.8L
- Connect a VAG 1551 or VAG 1552 scan tool and press buttons '0' and '1' to insert 'Engine Electronics' address word 01 (with engine running at idle).
- Press buttons '0' and '8' to select 'Read Measuring Value Block' function 08 , and press 'Q' button to confirm input.
- Press buttons '0', '0' and '2' to input display group number 2 , and press the 'Q' button to confirm input.
- Compare the display with the specified values for engine load.
- Disconnect the 3-pin harness connector from the MAF sensor.
- Connect a DMM between harness connector terminal 3 and engine ground, using adapter cables from VW1594 connector test kit.
- Switch the ignition to 'ON' and measure the voltage. It should be 11.5 volts.
- Switch ignition to 'OFF'.
If the voltage specification is not attained, check the wiring from terminal 3 to fuse panel, using an applicable wiring diagram.
- Connect a VAG1598/22 test box to the ECM harness connector.
- Check wiring for open circuits between the ECM/test box and the 3-pin MAF sensor harness connector. Check at the following points:
The value should be a maximum resistance of 1.5 ohms at each test point.
- If not, check the wiring for short circuits between terminals of 3-pin connector. The DMM should show infinite ohms.
- If the voltage supply and wiring are OK, replace the Mass Airflow (MAF) sensor-G70.