Oxygen Sensors After Catalytic Converter, Checking Signal Wire and Activation
Diagnostic Procedures
Oxygen Sensors after Catalytic Converter, Checking Signal Wire and Activation
Component location => [ Heater for Oxygen Sensor before Catalytic Converter, Checking ]. Heater For Oxygen Sensor Before Catalytic Converter, Checking
• Oxygen sensor signals are monitored via On Board Diagnostic (OBD).
- Check DTC memory. If an oxygen sensor malfunction is displayed.
- Disconnect respective harness connector for oxygen sensor (connector strip bolted to underside of transmission).
2 4-pin harness connector for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) and Oxygen Sensor (O2S) Heater 1 (Z29) behind catalytic converter, bank 1
3 4-pin harness connector for Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) and Oxygen Sensor (O2S) Heater 2 (Z30) behind catalytic converter, bank 2
- Perform voltage measurement between terminals 3 and 4 of connector at wiring harness using portable multimeter (VAG1526) (measurement range 2 V).
- Switch ignition on.
Specified value: 450 ± 50 mV behind catalytic converter.
- Switch ignition off.
If specified value is not obtained, check wire connections.
If specified value is reached, replace respective Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130)/Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131).
Wire Connections, Checking
- Connect test box (VAG1598/31) to wiring harness of Engine Control Module (ECM), refer to Repair Information.
- Check the following wire connections for open circuit, short circuit to B+ or Ground (GND).
• Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) bank 1
• Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) bank 2
- Repair open circuit in wiring or short circuit if necessary.
- Check wire connections to each other for short circuit.
- If wire connection is OK, replace Engine Control Module (ECM), refer to Repair Information and generate readiness code again => [ Readiness Code, Generating ] Monitors, Trips, Drive Cycles and Readiness Codes.