Oxygen Sensor Behind Three Way Catalytic Converter, Checking
Oxygen Sensor Behind Three Way Catalytic Converter, Checking
• Vehicle must be raised before the electrical connector for the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) is accessible.
• When servicing terminals 3 and 4 in the electrical harness connector of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) , use only gold-plated terminals.
Special tools, testers and auxiliary items required
• Multimeter.
• Wiring diagram.
Test requirements
• The Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) fuse Ok.
• Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC) Heater (G130) OK. Refer to the Repair Information.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window defroster, switched off.
• Vehicles with automatic transmission, selector lever in position "P" or "N".
• A/C switched off.
• Ground ) connections between engine/transmission/chassis OK.
• Exhaust system between catalytic converter and cylinder head properly sealed.
• Coolant Temperature at least 80 °C.
• Ignition switched OFF
Test procedure
- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check
Start diagnosis
- Connect scan tool.
- Start the engine and let it run at idle.
- Select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
- Select "Monitor ID 02: Oxygen sensor monitoring behind catalytic converter".
- Select following Test-IDs.
- Check the minimum voltage at idle.
Refer to Mode 6 table:=> [ Monitor-ID $02: Oxygen Sensor
Monitor Bank 1- Sensor 2 ] Diagnostic Modes 01 - 09 for minimum voltage values.
If the specified values were obtained:
- Switch ignition OFF. Fault is not active at this time. Check for poor connections, loose terminals and harness check.
If the specified values were Not obtained:
- Remove the right vehicle floor cover - arrows -.
Checking primary voltage
- Disconnect the brown Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector - arrow -.
- Switch the ignition ON.
- Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector terminals 3 to 4 for voltage.
Specified value: 0.400 to 0.500 Volts
- Switch the ignition OFF.
If the specified value was obtained:
- Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) Refer to the Repair Information.
If the specified value was Not obtained:
Checking wiring
- Remove the Engine Control Module (ECM) (J623). Refer to the Repair Information.
- Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector terminals to the Engine Control Module (ECM) (J623) electrical harness connector terminals for an open circuit according to the wiring diagram.
For 2008 - 2010 Passat:
For 2010 > CC:
Specified value: 1.5 ohms Max.
If the specified value was Not obtained:
- Check the wiring for an open, high resistance or short to ground.
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and the voltage supply was Not OK:
- Replace the Engine Control Module (ECM) (J623). Refer to the Repair Information.
- Install the right vehicle floor cover - arrows -.
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.