Oxygen Sensor O2S 2 Behind Three Way Catalytic Converter, Bank 2, Sensor 2, Checking

Observe all safety precautions: SAFETY PRECAUTIONS .

View clean working conditions: CLEAN WORKING CONDITIONS .

For wiring diagrams, component locations, and connector views, Refer to the appropriate System Wiring Diagram.

Special tools and workshop equipment required 

• Generic scan tool
• Multimeter.
• Wiring diagram.

Test requirements 

• The Oxygen Sensor O2S Behind Three Way Catalytic Converter Heater 2 - Z30- fuse Ok.
• Oxygen Sensor O2S Behind Three Way Catalytic Converter Heater 2 - Z30- OK. Refer to OXYGEN SENSOR O2S HEATER 2 BEHIND CATALYTIC CONVERTER, BANK 2, 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 .

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 Information.

-- Remove the engine covers. Refer to the appropriate Service Information.

-- Disconnect the oxygen sensor electrical harness connector. Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- -2-.

-- Switch ignition ON.

-- Using a Multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- electrical harness connector terminals 3 to 4 for voltage.

• Specification: 0.4 to 2 V

-- Switch ignition OFF.

If the specified value was obtained:

-- Replace the oxygen sensor. Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- Refer to the appropriate Service Information 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 appropriate Service Information 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 appropriate System Wiring Diagram.

Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- electrical harness connector terminals:	Engine Control Module - J623- electrical connector T94 terminals:
3	54
4	55

Specified value: 1.5 Ω 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. Engine Control Module - J623- Refer to the appropriate Service Information for removal and installation procedures.

Final procedures 

-- Reinstall the engine covers, if necessary. Refer to the appropriate Service Information.

-- For connector location, removal and installation procedures. Refer to the appropriate Service Information.

-- 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 .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .