With Manufacturer's Scan Tool
Oxygen Sensor (O2S) and Oxygen Sensor (O2S) control behind TWC, checking
Special tools and equipment
- VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3 adapter cable
- VAG1598/22 test box
- Multimeter US1119 (Fluke 83 or equivalent)
- VW1594 connector test kit
- Wiring diagram
Checking requirements
- Throttle valve control module adapted to ECM.
- Exhaust system free of leaks
- Engine coolant temperature at least 85°C (185°F) See VAG1551 scan tool function 08, display group 004, display field 3
Checking function
- Connect VAG1551 or VAG1552 scan tool and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at idle), Testing and Inspection
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block HELP
Input display group number xxx
- Press buttons -0-, -3- and -6- to input display group number 36 (036), and press -Q- button to confirm input.
Indicated on display (1-4 = display fields)
Read Measuring Value Block 36 ->
1 2 3 4
- Compare display and specified values (display fields 1-4):
Display Group 36:
If the specifications are attained:
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
- Switch ignition off.
Continuation
- Road test to condition oxygen sensor (eliminate possible contamination) and repeat test.
WARNING!
When driving or riding in an airbag equipped vehicle, NEVER hold the scan tool or other test equipment in your hands or lap while in motion. Objects between you and the airbag increase the risk of injury in an accident.
During a test drive in an airbag-equipped vehicle, test equipment must always be fastened to and operated from the rear seat by a second technician.
If the values are still NOT OK:
- Check Oxygen Sensor (O2S) heater(s) behind (TWC). Oxygen Sensor Heater For Oxygen Sensors Behind Three Way Catalytic Converter (TWC), Checking
- Briefly accelerate engine over 3000 RPM.
If the value in either display field 1 or field 3 remains constant: Evaluation of display group 36.
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
- Switch ignition off.
Evaluation of display group 36, display fields 1, 3
O2S reference voltage, checking
- Disconnect 4-pin connector for respective oxygen sensor.
Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC) -G130-, green connector (arrow)
Oxygen Sensor (O2S) 2 behind Three Way Catalytic Converter (TWC) -G131-, brown connector (arrow)
- Connect multimeter US1119 (Fluke 83 or equivalent) between harness connector terminals 3 and 4 (to ECM), using adapter cables from VW1594 connector test kit.
- Start engine and measure voltage.
Specified value: 0.40 to 0.50 volts
- Switch ignition off.
If voltage is NOT OK:
- Check HO2S wiring.
Bank 1, sensor 2
Bank 2, sensor 2
If voltage is OK:
- Replace respective O2S behind TWC.
Bank 1, sensor2 -G130-
Bank 2, sensor 2 -G131-
- Check readiness code. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code. [1][2][3]Output Diagnostic Test Mode (DTM) (Function 03)
O2S wiring bank 1, sensor 2, checking
- Connect VAG1598/22 test box to ECM harness connector.
- Disconnect 4-pin connector (green) for O2S -G130- (arrow).
- Check wiring for open circuit between ECM/test box and 4-pin 02S harness connector (to ECM).
Connector terminal 3 to ECM/test box socket 51
Connector terminal 4 to ECM/test box socket 52
Specified value: max. 1.5 Ohms
- Check wiring for short circuits between terminals of 4-pin connector.
Connector terminal 4 to ECM/test box socket 51
Specified value: Infinity Ohms
- Check shielding wire for short circuit to sensor wires.
Connector terminal 4 to ECM/test box socket 14
Connector terminal 3 to ECM/test box socket 14
Specified value: Infinity Ohms
If wiring is OK:
- Replace Motronic ECM -J220-. Service and Repair
O2S wiring, bank 2 sensor 2, checking
- Connect VAG1598/22 test box to ECM harness connector.
- Disconnect 4-pin connector (brown) for O2S -G131- (arrow).
- Check wiring for open circuit between ECM/test box and 4-pin O2S harness connector (to ECM).
Connector terminal 3 to ECM/test box socket 38
Connector terminal 4 to ECM/test box socket 50
Specified value: max. 1.5 Ohms
- Check wiring for short circuits between terminals of 4-pin connector.
Connector terminal 4 to ECM/test box socket 38
Specified value: Infinity Ohms
- Check shielding wire for short circuit to sensor wires.
Connector terminal 4 to ECM/test box socket 14
Connector terminal 3 to ECM/test box socket 14
Specified value: Infinity Ohms
If wiring is OK:
- Replace Motronic ECM -J220-. Service and Repair