HO2S Rear Oxygen Sensor Bank 1 Sensor 2, Checking

HO2S Rear Oxygen Sensor Bank 1 Sensor 2, Checking

• Vehicle must be raised before the electrical connector of the HO2S Oxygen Sensor Bank 1 Sensor 2 (G130) is accessible.

• When servicing terminals 3 and 4 in the electrical harness connector of the HO2S Oxygen Sensor Bank 1 Sensor 2 (G130) , use only gold-plated terminals.

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The HO2S Oxygen Sensor Bank 1 Sensor 2 (G130) fuse OK.

• Oxygen Sensor Heater Bank 1 Sensor 2 (Z29) OK.

• 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 connections between engine/transmission/chassis OK.

• Exhaust system between catalytic converter and cylinder head properly sealed.

• Coolant Temperature at least 80° C.

Test procedure

- Observe safety precautions. Refer to => [ Safety Precautions ] Safety Precautions

- Observe Clean Working Conditions. Refer to => [ Clean Working Conditions ] Clean Working Conditions

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check.

Function test

- Perform the function test in Diagnostic Mode 06. Refer to => [ Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions ] Diagnostic Modes 01 - 09.

- Switch ignition Off.

If the Mode 6 specified values were Not obtained:

Start diagnosis

- Disconnect the HO2S Oxygen Sensor Bank 1 Sensor 2 (G130) electrical harness connector.

Checking primary voltage

- Switch the ignition On.

- Using a multimeter, check the HO2S Oxygen Sensor Bank 1 Sensor 2 (G130) electrical harness connector terminals 3 to 4 for voltage.

Specified value: 4.10 to 5.00 V

- Switch the ignition Off.

If the specified value was obtained:

- Replace the HO2S Oxygen Sensor Bank 1 Sensor 2 (G130). Refer to the repair information.

If the specified value was Not obtained:

Checking wiring

- Remove the Engine Control Module (ECM) (J623). Refer to the repair information.

- Using a multimeter, check the HO2S Oxygen Sensor Bank 1 Sensor 2 (G130) electrical harness connector terminals to the Engine Control Module (ECM) (J220) electrical harness connector T94 terminals for an open circuit.






Specified value: 1.5 ohms Max.

If the specification was Not obtained:

- Check the wiring for high resistance, an open or a short to voltage or ground.

- 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.

Final procedures

After repair work, the following work steps must be performed in the mentioned 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 ] Monitors, Trips, Drive Cycles and Readiness Codes.