Heated Oxygen Sensor Ho2S 2, Bank 2, Sensor 1, 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 

• Multimeter.
• Wiring diagram.

Test requirements 

• The Oxygen Sensor (O2S) Heater -Z28- fuse OK.
• The Oxygen Sensor (O2S) Heater -Z28- before catalytic converter OK. Refer to OXYGEN SENSOR O2S HEATER 2, BANK 2, SENSOR 1, CHECKING .
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window defroster, switched OFF.
• 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 

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

-- 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 01: Oxygen sensor monitoring before catalytic converter".

-- Select "Test-ID 131: Dynamic test".

-- Check the specified values at idle.

Dynamic test		Specified value
		min.	max.
Normal operation		0.35009	-
Reduced threshold upon suspicion of malfunction in catalytic converter		0.39990	-

If the specified value was obtained:

-- 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:

Checking voltage 

-- Disconnect the Heated Oxygen Sensor (HO2S) -G108- / Oxygen sensor 2 heater -Z28- electrical harness connector -1-.

-- Using a Multimeter, check the Heated Oxygen Sensor (HO2S) -G108- electrical harness connector -1- terminals 1 to 6 for voltage.

-- Switch the ignition ON.

Specified value: 0.4 to 2 Volts.

-- Switch the ignition OFF.

If the specified value was obtained:

-- Replace the Heated Oxygen Sensor (HO2S) -G108-. Refer to the appropriate Service Information.

-- Go to Final procedures.

If the specified value was Not obtained:

Checking wiring 

-- Remove the Engine Control Module -J623-. Refer to the appropriate Service Information.

-- Using a multimeter, check the Heated Oxygen Sensor (HO2S) -G108- electrical harness connector terminals to the Engine Control Module -J623- electrical harness connector T94 terminals for an open circuit.

Heated Oxygen Sensor (HO2S) -G108- electrical harness connector terminals:	Engine Control Module -J623- electrical connector T94 terminals:
1	81
2	59
4	60
6	62

Specified value: 1.5 Ω Max.

If the specified value was Not obtained:

-- Check the wiring for a short circuit to Battery (+), or an open circuit.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

-- Go to Final procedures.

If the specified value was obtained:

-- Replace the Engine Control Module -J623-. Refer to the appropriate Service Information.

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 .