New Beetle GL L4-2.0L (AZG) (2002)
-
Battery voltage must be at least 11.5 volts.
-
All electrical consumers such as, for example, lights and rear window defroster must be switched off.
-
Parking brake must be engaged or else daylight driving lights will be switched on.
-
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 degrees C, Diagnostic mode 1: Check measuring values; PID 5, Coolant temperature.
-
Oxygen sensor heater for oxygen sensor before catalytic converter must be OK. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Component Tests and General Diagnostics/Oxygen Sensor, Checking
Function test (Vehicles with engine code AEG)
-
Select the lambda 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.
-
Connect multimeter to terminals 3 + 4 of connector to Engine Control Module (ECM) for voltage measurement.
-
Switch on ignition and measure primary voltage.
Specified value: 0.400 to 0.500 Volts
-
Switch ignition off.
If specified value is not obtained:
-
Test oxygen sensor wires.
If specified value is obtained:
-
Replace Heated Oxygen Sensor (HO2S) 1 Bank 1 -G39- before catalytic converter, item 9.
-
Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
-
Generate readiness code. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles
and Readiness Codes