Oxygen Sensor O2S Behind Three Way Catalytic Converter, Bank 1, Sensor 2, Checking
Oxygen Sensor O2S Behind Three Way Catalytic Converter, Bank 1, Sensor 2, Checking
Observe all safety precautions: => [ Safety Precautions ] Generic Scan Tool
View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
• For connector location, removal and installation procedures. Refer to the appropriate service manual.
• When servicing terminals 3 and 5 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
• Generic scan tool
• Multimeter.
• Wiring diagram.
Test requirements
• The Oxygen Sensor O2S Behind Three Way Catalytic Converter Heater (Z29) fuse OK.
• Oxygen Sensor O2S Behind Three Way Catalytic Converter Heater (Z29) OK. Refer to => [ Oxygen Sensor O2S Heater Behind Catalytic Converter, Bank 1, Sensor 2, Checking ] Oxygen Sensor O2S Heater Behind Catalytic Converter, Bank 1, Sensor 2, Checking.
• 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 (GND) connections between engine/transmission/chassis OK.
• Exhaust system between catalytic converter and cylinder head properly sealed.
• Coolant Temperature at least 80° C.
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 "Test-ID 02: Oxygen sensor monitoring behind catalytic converter".
- Select following Test-IDs.
- Compare the specified values in the Mode 6 table to the scan tool readings at idle.
If the specified value was obtained:
- Switch the ignition OFF.
- Fault may be intermittent.
- Check for loose or corroded connections and any leaks in the exhaust.
- Check Freeze Frame data for conditions when the DTC set.
- Go to Final procedures
If the specified value was Not obtained:
- For connector location, removal and installation procedures. Refer to the appropriate service manual.
- Remove the engine covers. Refer to the appropriate service manual.
- Disconnect the oxygen sensor electrical harness connector. Oxygen sensor after three way catalytic converter (G130) - 1 -
- Switch ignition ON.
- Using a Multimeter, check the Oxygen sensor after three way catalytic converter (G130) electrical harness connector terminals 3 to 4 for voltage.
• Specification: 0.400 to 0.500 V
- Switch ignition OFF.
If the specified value was obtained:
- Replace the oxygen sensor. Oxygen sensor after three way catalytic converter (G130) Refer to the appropriate service manual for removal and installation procedures.
- Go to Final procedures
If the specified value was Not obtained:
Checking wiring and connections
- Remove the engine control module. Refer to the service manual for removal and installation procedures.
- Using a Multimeter, measure the resistance of the signal and reference ground circuits between the oxygen sensor and the engine control module. Refer to the applicable wiring diagram.
Specified value: 1.5 ohms max.
If the specified value was Not obtained:
- Check the circuits for a short to each other, short to battery voltage, and short to ground.
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- Repair the wiring or connection as necessary.
- Go to Final procedures
If the specified value was obtained:
- Check the wiring connection for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connections, if no faults were found.
- Replace the engine control module. Motronic Engine Control Module (ECM) (J623) Refer to the service manual for removal and installation procedures.
Final procedures
- Reinstall the engine covers, if necessary. Refer to the appropriate service manual.
- For connector location, removal and installation procedures. Refer to the appropriate service manual.
- 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 ] Programming and Relearning.