Signal Wire and Activation Check

Oxygen Sensor Signal Wire And Activation, Checking


NOTE: The oxygen sensor signal is monitored by the OBD system.


- Check DTC memory.
- If a oxygen sensor malfunction is displayed and the oxygen sensor heater is OK, disconnect harness connector for relevant oxygen sensor.







- Test voltage by connecting hand-held multimeter Fluke 83 (or equivalent) (measuring range 2 V) between sockets 3 and 4 of connector on wiring harness.
- Switch ignition on. Specified value: 450 ± 50 mV.

If the Specified value is not obtained, check oxygen sensor wiring:
Bank 1, Sensor 1.
Bank 1, Sensor 2 .
Bank 2, Sensor 1.
Bank 2, Sensor 2.

If Specified value is obtained:
- Replace relevant oxygen sensor.

Checking oxygen sensor wiring for Heated Oxygen Sensor (HO2S) -G39

- Disconnect 4-pin connector (black) for Heated Oxygen Sensor (HO2S) -G39.
- Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to engine control module itself. [1][2]Scan Tool Connecting and Initial Checks
- Check following wiring connections for open circuits:

Connector on VAG1598/31 test
wiring harness, box socket
socket
3 51
4 70

Resistance in wiring: max. 1.5 Ohms







- Check wiring also on 4-pin harness connector for short circuits to each other.

Connector on VAG1598/31 test
wiring harness, box socket
socket
4 51

Specified value: Infinite Ohms (open circuit)

- Check shielded wire for short circuit to sensor wiring.

Connector on VAG1598/31 test
wiring harness, box socket
socket
4 32
3 32

Specified value: Infinte Ohms (open circuit)

If no malfunction is identified in the wiring:
- Replace Motronic Engine Control Module (ECM) -J220.

Checking wiring for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130

- Disconnect 4-pin connector (black) for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130.
- Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. [1][2]Scan Tool Connecting and Initial Checks







- Check following wiring connections for open circuits:

Connector on VAG1598/31 test
wiring harness, box socket
socket
3 68
4 69

Resistance in wiring: max. 1.5 Ohms







- Check wiring also on 4-pin harness connector for short circuits to each other.

Connector on VAG1598/31 test
wiring harness, box socket
socket
4 68

Specified value: Infinte Ohms (open circuit)

- Check shielded wire for short circuit to sensor wiring.

Connector on VAG1598/31 test
wiring harness, box socket
socket
4 32
3 32

Specified value: Infinte Ohms (open circuit)

If no malfunction is identified in the wiring:
- Replace Motronic Engine Control Module (ECM) -J220.

Checking wiring for Heated Oxygen Sensor (HO2S) 2 -G108

- Disconnect 4-pin connector (black) for Heated Oxygen Sensor (HO2S) 2 -G108.
- Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. [1][2]Scan Tool Connecting and Initial Checks
- Check following wiring connections for open circuits:







Connector on VAG1598/31 test
wiring harness, box socket
socket
3 12
4 13

Resistance in wiring: max. 1.5 Ohms







- Check wiring also on 4-pin harness connector for short circuits to each other.

Connector on VAG1598/31 test
wiring harness, box socket
socket
4 12

Specified value: Infinite Ohms (open circuit)

- Check shielded wire for short circuit to sensor wiring.

Connector on VAG1598/31 test
wiring harness, box socket
socket
4 32
3 32

Specified value: Infinite Ohms (open circuit)

If no malfunction is identified in the wiring:
- Replace Motronic Engine Control Module (ECM) -J220.

Checking wiring for Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131

- Disconnect 4-pin connector for Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131







- Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. [1][2]Scan Tool Connecting and Initial Checks
- Check following wiring connections for open circuits:

Connector on VAG1598/31 test
wiring harness, box socket
socket
3 10
4 11

Resistance in wiring: max. 1.5 Ohms







- Check wiring also on 4-pin harness connector for short circuits to each other.

Connector on VAG1598/31 test
wiring harness, box socket
socket
4 10

Specified value: Infinte Ohms (open circuit)

- Check shielded wire for short circuit to sensor wiring.

Connector on VAG1598/31 test
wiring harness, box socket
socket
4 32
3 32

Specified value: Infinte Ohms (open circuit)

If no malfunctions are identified in the wiring:
- Replace Motronic Engine Control Module (ECM) -J220.

If no malfunction can be identified in the wiring:
- Replace Motronic Engine Control Module (ECM) -J220.
- Display readiness code. The readiness code must be generated if the DTC memory was erased.Readiness Code Reading Readiness Code, Generating