Oxygen Sensor Signal Wiring and Actuation, Checking
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. Specification: 450 ± 50 mV.
If the specification is not obtained, check oxygen sensor wiring:
Bank 1, Sensor 1.
Bank 1, Sensor 2.
Bank 2, Sensor 1.
Bank 2, Sensor 2.
If specification 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. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" Testing and Inspection
- Check following wiring connections for open circuits:
Connector on VAG1598/31 test box
wiring harness, 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.
Connection on VAG 1598/31 test box
wiring harness, socket
socket
4 51
Specification: Infinite Ohms (open circuit)
- Check shielded wire for short circuit to sensor wiring.
Connector on VAG1598/31 test box
wiring harness, socket
socket
4 32
3 32
Specification: Infinite Ohms (open circuit)
If no malfunction is identified in the wiring:
- Replace Motronic Engine Control Module (ECM) -J220.
Checking wiring for Oxygen Sensor (025) 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. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" Testing and Inspection
- Check following wiring connections for open circuits:
Connector on VAG1598/31 test box
wiring harness, 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 box
wiring harness, socket
socket
4 68
Specification: Infinite Ohms (open circuit)
- Check shielded wire for short circuit to sensor wiring.
Connector on VAG1598/31 test box,
wiring harness, socket
socket
4 32
3 32
Specification: Infinite 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. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" Testing and Inspection
- Check following wiring connections for open circuits:
Connector on VAG1598/31 test box
wiring harness, 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 box
wiring harness, socket
socket
4 12
Specification: Infinite Ohms (open circuit)
- Check shielded wire for short circuit to sensor wiring.
Connector on VAG1598/31 test box
wiring harness, socket
socket
4 32
3 32
Specification: infinite Ohms (open circuit)
If no malfunction is identified in the wiring:
- Replace Motronic Engine Control Module (ECM) -J220.
Checking wiring for Oxygen Sensor (028) 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. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" Testing and Inspection
- Check following wiring connections for open circuits:
Connector on VAG1598/31 test box
wiring harness, 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 box
wiring harness socket
socket
4 10
Specification: Infinite Ohms (open circuit)
- Check shielded wire for short circuit to sensor wiring.
Connector on 5GVAG1598/31 test box
wiring harness, socket
socket
4 32
3 32
Specification: infinite 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. A new readiness code must be generated if the DTC memory was erased. Refer to "Monitors, Trips and/or Drive Cycle/Generating,Readiness Code" Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle/Checking,Readiness Code" Testing and Inspection