Jetta SportWagen L5-2.5L (CBUA) (2009)
If the specification was not obtained:
-
Replace the Heated Oxygen Sensor (HO2S) (G39)20.
If the specification is obtained:
Checking voltage supply
-
Turn the ignition switch ON
-
Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminal 4 to engine ground for voltage.
Specified value: Battery voltage.
If the specification was not obtained:
-
Check the wiring for an open, high resistance or short to Ground (GND) and replace any open fuse.
-
Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-
If necessary, repair the faulty wiring connection.
If the specification was obtained:
Checking Ground (GND) activation
If the manufacturers test box is being used, perform the following step.
-
Install the test box.
If the manufacturers test box is not being used, perform the following step.
-
Remove the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .
-
Using a multimeter, check the Heated Oxygen Sensor (HO2S) (G39) electrical harness connector terminal 3 to the Motronic Engine Control
Module (ECM) (J623) electrical harness connector T121 terminal 5 for an open circuit.
Specified value: 1.5 ohms max.
If the specification was not obtained:
-
Check the wiring for an open, high resistance, short circuit to each other, Battery (+), and Ground (GND).