Oxygen Sensor and Sensor Regulation After Catalytic Converter, Checking

Diagnostic Procedures


Oxygen Sensor and Sensor Regulation after Catalytic Converter, Checking

Oxygen Sensor 1 after Catalytic Converter

The following procedure is used to diagnose Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) which is controlled by the Motronic Engine Control Module (ECM) (J623).

• When servicing the electrical harness connector terminals of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) , use only gold-plated terminals.

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Motronic Engine Control Module (ECM) (J623) fuses OK.

• Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater (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 (GND) connections between engine/transmission/chassis OK.

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

• Coolant Temperature at least 80 °C.

Function test

- Perform the function test located in diagnostic mode 06. Refer to => [ OBDMID 02 ($02): Oxygen Sensor
Monitor Bank 1- Sensor 2 ] Diagnostic Modes 01 - 09.

If specified values are obtained:

- End diagnosis and switch the ignition off.

If the specified values are not obtained:

Procedure

- Raise the vehicle.

- Loosen the quick release fasteners - 1 - and - 2 - and remove the noise insulation panel.





- Disconnect the black Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector- 2 -.

Checking primary voltage

- Crank the engine.

- Using a multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) 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) Behind Three Way Catalytic Converter (TWC) (G130).

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 Motronic Engine Control Module (ECM) (J623).

- Using a Multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130) electrical harness connector terminals to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T94a terminals for an open circuit.









Specified value: 1.5 ohms Max.

If the specification was not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

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

- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring:

- Replace the Motronic Engine Control Module (ECM) (J623).

- Assembly is performed in the reverse order of 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 ] 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.

- End of diagnosis.

Oxygen Sensor 2 after Catalytic Converter

The following procedure is used to diagnose Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) which is controlled by the Motronic Engine Control Module (ECM) (J623).

• When servicing the electrical harness connector terminals of the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) , use only gold-plated terminals.

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Motronic Engine Control Module (ECM) (J623) fuses OK.

• Oxygen Sensor (O2S) 2 (behind Three Way Catalytic Converter (TWC)) Heater (Z30) 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 (GND) connections between engine/transmission/chassis OK.

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

• Coolant Temperature at least 80 °C.

Function test

- Perform the function test located in diagnostic mode 06. Refer to => [ OBDMID 06 ($06): Oxygen Sensor
Monitor Bank 2 - Sensor 2 ] Diagnostic Modes 01 - 09.

If specified values are obtained:

- End diagnosis and switch the ignition off.

If the specified values are not obtained:

Procedure

- Raise the vehicle.

- Loosen the quick release fasteners - 1 - and - 2 - and remove the noise insulation panel.





- Disconnect the black Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector- 4 -.





Checking primary voltage

- Switch the 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.





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) (G131).

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 Motronic Engine Control Module (ECM) (J623). Refer to Repair Manual

- Using a Multimeter, check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131) electrical harness connector terminals to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T94a terminals for an open circuit.









Specified value: 1.5 ohms Max.

If the specification was not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

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

- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring:

- Replace the Motronic Engine Control Module (ECM) (J623).

- Assembly is performed in the reverse order of 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 ] 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.

- End of diagnosis.

Oxygen Sensor 3 after Catalytic Converter

The following procedure is used to diagnose Oxygen Sensor (O2S) 3 Behind Three Way Catalytic Converter (TWC) (G287) which is controlled by the Engine Control Module (ECM) 2 (J624).

• When servicing the electrical harness connector terminals of the Oxygen Sensor (O2S) 3 Behind Three Way Catalytic Converter (TWC) (G287) , use only gold-plated terminals.

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Engine Control Module (ECM) 2 (J624) fuses OK.

• Oxygen Sensor 02S) 3 (behind Three Way Catalytic Converter (TWC)) Heater (Z64) 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 (GND) connections between engine/transmission/chassis OK.

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

• Coolant Temperature at least 80 °C.

Function test

- Perform the function test located in diagnostic mode 06. Refer to => [ OBDMID 10 ($0A): Oxygen Sensor
Monitor Bank 3 - Sensor 2 ] Diagnostic Modes 01 - 09.

If specified values are obtained:

- End diagnosis and switch the ignition off.

If the specified values are not obtained:

Procedure

- Raise the vehicle.

- Loosen the quick release fasteners - 1 - and - 2 - and remove the noise insulation panel.





- Disconnect the brown Oxygen Sensor (O2S) 3 Behind Three Way Catalytic Converter (TWC) (G287) electrical harness connector- 1 -.





Checking primary voltage

- Crank the engine.

- Using a multimeter, check the Oxygen Sensor (O2S) 3 Behind Three Way Catalytic Converter (TWC) (G287) 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) 3 Behind Three Way Catalytic Converter (TWC) (G287).

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) 2 (J624).

- Using a Multimeter, check the Oxygen Sensor (O2S) 3 Behind Three Way Catalytic Converter (TWC) (G287) electrical harness connector terminals to the Engine Control Module (ECM) 2 (J624) electrical harness connector T94d terminals for an open circuit.









Specified value: 1.5 ohms Max.

If the specification was not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

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

- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring:

- Replace the Engine Control Module (ECM) 2 (J624).

- Assembly is performed in the reverse order of 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 ] 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.

- End of diagnosis.

Oxygen Sensor 4 after Catalytic Converter

The following procedure is used to diagnose Oxygen Sensor (O2S) 4 Behind Three Way Catalytic Converter (TWC) (G288) which is controlled by the Engine Control Module (ECM) 2 (J624).

• When servicing the electrical harness connector terminals of the Oxygen Sensor (O2S) 4 Behind Three Way Catalytic Converter (TWC) (G288) , use only gold-plated terminals.

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Engine Control Module (ECM) 2 (J624) fuses OK.

• Oxygen Sensor 02S) 4 (behind Three Way Catalytic Converter (TWC)) Heater (Z65) 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 (GND) connections between engine/transmission/chassis OK.

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

• Coolant Temperature at least 80 °C.

Function test

- Perform the function test located in diagnostic mode 06. Refer to => [ OBDMID 14 ($0E): Oxygen Sensor
Monitor Bank 4 - Sensor 2 ] Diagnostic Modes 01 - 09.

If specified values are obtained:

- End diagnosis and switch the ignition off.

If the specified values are not obtained:

Procedure

- Raise the vehicle.

- Loosen the quick release fasteners - 1 - and - 2 - and remove the noise insulation panel.





- Disconnect the brown Oxygen Sensor (O2S) 4 Behind Three Way Catalytic Converter (TWC) (G288) electrical harness connector- 1 -.





Checking primary voltage

- Crank the engine.

- Using a multimeter, check the Oxygen Sensor (O2S) 4 Behind Three Way Catalytic Converter (TWC) (G288) 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) 4 Behind Three Way Catalytic Converter (TWC) (G288).

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) 2 (J624).

- Using a Multimeter, check the Oxygen Sensor (O2S) 4 Behind Three Way Catalytic Converter (TWC) (G288) electrical harness connector terminals to the Engine Control Module (ECM) 2 (J624) electrical harness connector T94d terminals for an open circuit.









Specified value: 1.5 ohms Max.

If the specification was not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

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

- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring:

- Replace the Engine Control Module (ECM) 2 (J624).

- Assembly is performed in the reverse order of 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 ] 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.

- End of diagnosis.