OXYGEN SENSOR 1 HEATER, CHECKING Audi A3 8P facelift

OXYGEN SENSOR 1 HEATER, CHECKING

Note. Vehicle must be raised before electrical harness connector for the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- is accessible. When servicing terminals in harness connector of Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-, use only gold-plated terminals.

Special tools and workshop equipment required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- fuse OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
5. A/C switched off.
6. Ground (GND) connections between engine/transmission/chassis OK.
7. Ignition switched off.

Test procedure

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

Start diagnosis

Remove the right vehicle floor cover -arrows-.

Checking internal resistance

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

Using a Multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- electrical harness connector terminals 1 to 2 for resistance.

Scheme 100

Specified value: 1.0 to 20.0 ohms (at approx. 20° C)

If the specification was not obtained

Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130-. Refer to Repair information.

If the specification was obtained

Checking voltage supply

Using a Multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) - G130- electrical harness connector terminal 1 to Engine Component Power Supply Relay -J757- terminal 2 for an open circuit.

Specified value: Battery voltage.

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 the specification was obtained

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.

Install the test box. Refer to Repair information.

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

Remove the Motronic Engine Control Module (ECM) -J220-. Refer to Repair information.

Using a Multimeter, check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) -J220- electrical harness connector T94 terminal 7 for an open circuit according to the wiring diagram.

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 detected in the wiring and if the voltage supply was OK

Replace the Motronic Engine Control Module (ECM) -J220-. Refer to Repair information.

Install the right vehicle floor cover.

Final procedures

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»(ref-496054-S19296251252012082100000) .
2. If necessary, erase the DTC memory. Refer to «DIAGNOSTIC MODE 04 - ERASE DTC MEMORY»(ref-496054-S06987146602012082100000) .
3. If the DTC memory was erased, generate readiness code. Refer to «READINESS CODE»(ref-496054-S23770317242012082100000) .

End of diagnosis.