Oxygen Sensor In Center Catalytic Converter, Checking

Special Tools And Workshop Equipment Required 

• Multimeter
• Wiring diagram.

Test Requirements 

• Fuse 15 in Fuse Box B is OK.
• Engine Control Module (ECM) -J623- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window defroster, switched off.
• Vehicles with automatic transmission, shift selector lever into position "P" or "N".
• A/C switched off.
• Ground (GND) connections between engine/transmission/chassis OK.
• Ignition switched off.

Test Procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

Start Diagnosis 

-- Perform the function test in Diagnostic Mode 06.

If specified values are obtained:

-- Check for possible intermittent connection or rub through of harness.

If the specified values are not obtained:

Checking primary voltage

-- Disconnect the Oxygen Sensor (O2S) 2 in center Three Way Catalytic Converter (TWC) -G465- electrical harness connector.

-- Switch the ignition on.

-- Using a multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G465- 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) 2 Behind Three Way Catalytic Converter (TWC) -G465-.

If the specified value was Not obtained:

Checking wiring

If the manufacturers test box is being used, perform the following step.

-- Install the test box.

If the manufacturers test box is not being used, perform the following step.

-- Remove the Engine Control Module (ECM) -J623-. Refer to the Repair Information.

-- Using a multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G465- electrical harness connector terminals to the Engine Control Module (ECM) -J623- electrical harness connector T94 terminals for resistance.

Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G465- electrical harness connector terminals	Engine Control Module (ECM) -J623- electrical connector T94 terminals or test box sockets
3	72
4	84

Specified Value: 1.5 Ω Max. 

If the specified value was Not obtained:

-- Check the wiring for an open, high resistance, short circuit to each other, Battery (+), and Ground (GND).

-- 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.

-- Assembly is performed in the reverse of the removal.

Final Procedures 

After 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 .