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Oxygen Sensor Heater before Catalytic Converter, Checking



Oxygen Sensor Heater Before Catalytic Converter, Checking

Oxygen Sensor Heater, Checking

NOTE:
- Oxygen Sensor (O2S) Heater Z19 is part of Heated Oxygen Sensor (H02S) G39 and cannot be replaced separately.
- When servicing electrical harness connector terminals for the Heated Oxygen Sensor (H02S), use only gold-plated terminals.

Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.

Test requirements
- Fuse (on fuse panel) S243 OK.
- Fuel Pump (FP) Relay J17 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. General Diagnosis

Start diagnosis
- Remove the engine cover with air filter.

Checking internal resistance







- Disconnect the Heated Oxygen Sensor (HO2S) G39 electrical harness connector - 2 -.







- Using a multimeter, check the Heated Oxygen Sensor (HO2S) terminals 3 to 4 for an open circuit.

Specified value: 2.5 to 10.0 Ohms (at approx. 20 degrees C)

If the specification was not obtained:
- Replace the Heated Oxygen Sensor (HO2S) G39 or the Heated Oxygen Sensor (HO2S) 2 G108.

If the specification was obtained:

Checking voltage supply







- Using a multimeter, check the Heated Oxygen Sensor (HO2S) electrical harness connector terminal 4 to ground (GND) for voltage.

Specified value: Battery voltage.

If the specification was not obtained:
- Check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal 3 to the Fuel Pump (FP) Relay J17 socket 23/87 an open circuit, a short circuit to each other, Battery (+), or Ground (GND).
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connection.

If the specification was obtained:

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.
- Install the test box VAG1598/31.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J220.







- Using a multimeter, check the Heated Oxygen Sensor (HO2S) electrical harness connector to the Motronic Engine Control Module (ECM) J220 electrical harness connector for resistance.

Oxygen Sensor (O2S) Heater Motronic Engine Control Module
Z19 electrical harness (ECM) J220 electrical connector
connector terminal terminal or test box socket
4 5

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, loose or broken terminals.
- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK:
- Erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
- Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. General Diagnosis
- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
- Replace the Motronic Engine Control Module (ECM) J220.
- 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. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code.

End of diagnosis

Oxygen Sensor 2 Heater, Checking

NOTE:
- Oxygen Sensor (O2S) 2 Heater Z28 is part of Heated Oxygen Sensor (HO2S) 2 G108 and cannot be replaced separately.
- When servicing electrical harness connector terminals for the Heated Oxygen Sensor (HO2S), use only gold-plated terminals.

Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.

Test requirements
- Fuse (on fuse panel) S243 OK.
- Fuel Pump (FP) Relay J17 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. General Diagnosis

Start diagnosis
- Remove the engine cover with air filter.

Checking internal resistance







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







- Using a multimeter, check the Heated Oxygen Sensor (HO2S) 2 G108 terminals 3 to 4 for resistance.

Specified value: 2.5 to 10.0 Ohms (at approx. 20 degrees C)

If the specification was not obtained:
- Replace the Heated Oxygen Sensor (HO2S) 2 G108.

If the specification was obtained:

Checking voltage supply







- Using a multimeter, check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal 4 to ground (GND) for voltage.

Specified value: Battery voltage.

If the specification was not obtained:
- Check the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector terminal 3 to the Fuel Pump (FP) Relay J17 socket 23/87 an open circuit, a short circuit to each other, Battery (+), or Ground (GND).
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connection.

If the specification was obtained:

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.
- Install the test box VAG1598/31.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J220.







- Using a multimeter, check the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector to the Motronic Engine Control Module (ECM) J220 electrical harness connector for resistance.

Heated Oxygen Sensor Motronic Engine Control Module (ECM)
(HO2S) 2 G108 electrical J220 electrical connector terminal
harness connector terminal or test box socket
4 4

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, loose or broken terminals.
- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK:
- Erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
- Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code.
- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
- Replace the Motronic Engine Control Module (ECM) J220.
- 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. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code.

End of diagnosis
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