Jetta L4-2.0L (AZG) (2004)
-
Wiring diagram
Test requirements
-
The respective fuses of Heated Oxygen Sensor (HO2S) -G39- must be OK.
-
Battery voltage must be at least 11.5 volts.
-
All electrical consumers like, for example, lights and rear window heating must be switched off.
-
Parking brake must be engaged or else daylight driving lights will be switched on.
-
For vehicles with automatic transmission, selector lever must be in position -P- or -N-.
-
If vehicle is equipped with an A/C system, it must be switched off.
-
Ground (GND) connections between engine and chassis must be OK.
-
Exhaust system must be properly sealed between catalytic converter and cylinder head.
-
Coolant temperature must be at least 80 degree C, Diagnostic mode 1: Check measuring values; PID 5, Coolant temperature. See: Testing and
Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 1: Check Measured Values
-
Oxygen sensor heater for oxygen sensor before catalytic converter must be OK, check.
Function test (Vehicles with engine code AEG)
-
Select the oxygen sensor test results and check whether the specified values are being reached, Diagnostic mode 5: Check output of oxygen sensor
signals.
-
End diagnosis and switch ignition off.
If specified values are not obtained:
-
Check primary voltage.
Checking primary voltage
-
Unscrew protective cover (arrows) and disconnect 4-pin harness connector (black) -1- to Heated Oxygen Sensor (HO2S) -G39- before catalytic
converter.