Oxygen Sensor O2S Behind Three Way Catalytic Converter, Bank 1, 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 - 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 .
• 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 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: 0.4 to 2 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 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 after three way catalytic converter - G130- electrical harness connector terminals:	Engine Control Module - J623- electrical connector T94 terminals:
3	76
4	32

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 .