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Sensor and Control Check




Oxygen Sensor and Oxygen Sensor Control (After Three Way Catalytic Converter (TWC)), Checking

NOTE: Only gold plated contacts must be used to repair terminals 3 and 4 in the oxygen sensor harness connectors.


Special tools and equipment
- VAG1551 Scan Tool (ST) or VAG1552 mobile scan tool with VAG1551/3 adapter cable
- VAG1598/31 test box
- Multimeter (Fluke 83 or equivalent)
- VW1594 adapter set
- Wiring diagram

Test requirements







- Fuse 43 OK
- Exhaust system between Three Way Catalytic Converter (TWC) and cylinder head free of leaks
- Coolant temperature at least 85 °C = display group 04, display field 3

Functional check
- Press buttons -0- and -1- to insert "Engine Electronics" address word 01. When doing this engine must be running at idle (connecting scan tool and selecting engine electronics control module.

Indicated on display


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -4- to select "Basic Setting" function 04 and press -Q- button to confirm input.

Indicated on display


Basic Setting
Input display group number XXX


- Press buttons -0-, -3-, and -0- to input display group number 30 (030) and press - Q- button to confirm input.

Indicated on display: (1-2 = display fields)


Read Measuring Value Block 30 ->
1 2


- Check status of oxygen sensor control after Three Way Catalytic Converter (TWC) (display field 2).


Display Group 030:






Explanation of 3 digit number block in display field 2







If the specified value is obtained:
- Change to display group 36 as follows:
- Press -C- button.
- 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


- Depress brake pedal and hold.


NOTE: Engine speed will be increased by Engine Control Module (ECM).


- Check oxygen sensor voltage in display field 1.
- Allow engine to run at an increased speed until specified value "B1-P2 OK" appears in display field 4.
If the diagnostic is initiated from the Engine Control Module (ECM), the display in display field 4 changes from "Test OFF" to "Test ON."


Display Group 036:






If the specified value is obtained:
- Release brake pedal.
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
- Switch ignition off.

Continuation
If the specified value is not obtained:
- Release brake pedal.
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06 and press -Q- button to confirm input.
- Carry out road test to remove possible residue on oxygen sensor and repeat check.

Observe the valid safety precautions when carrying out a road test. Refer to "Fuel Delivery and Air Induction", Service Precautions

If the specified values are still not obtained:
- Replace oxygen sensor behind Three Way Catalytic Converter (TWC) -G130-. Refer to item 28 under "Fuel Delivery and Air Induction/Fuel Injector", Service and Repair
- Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
- Display readiness code.

If DTC memory has been erased or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, the readiness code must be generated again.

Evaluating display group 36, display field 1 - Lambda probe voltage Lambda probe after catalyst







Possible causes of malfunction if 02S sensor control frequency is too slow:
- The slots or holes in O2S sensor body are blocked
- The O2S sensor vent hole in area of connecting wire is blocked
- The O2S sensor has been overheated (glazed)
- The O2S sensor has been damaged by leaded fuel

Checking basic voltage for oxygen sensor 2







- Remove protective cover (arrows) and disconnect 4-pin harness connector (brown) -1 - to oxygen sensor after Three Way Catalytic Converter (TWC) -G130-.







- Connect multimeter using auxiliary cables from VW1594 to measure voltage at terminals 3 + 4 (harness connector to Motronic Engine Control Module (ECM)).
- Start engine and measure basic voltage.
Specified value: 0.400-0.500 V
- Switch ignition off.

If the specified value is not obtained:
- Check oxygen sensor wiring.

If the specified value is obtained:
- Replace oxygen sensor behind Three Way Catalytic Converter (TWC) -G130-. Refer to item 28 under "Fuel Delivery and Air Induction/Fuel Injector", Service and Repair
- Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
- Display readiness code.

If DTC memory has been erased or the Engine Control Module (ECM) was disconnected from permanent battery (B+) voltage, the readiness code must be generated again.

Checking oxygen sensor wiring, oxygen sensor 2
- Remove wiper arms and plenum chamber cover.







- Connect VAG1598/31 test box to Engine Control Module (ECM) wiring harness. Engine Control Module (ECM) is not connected by this action.







- Check wiring for open circuit between test box and 4-pin harness connector to Motronic Engine Control Module (ECM) according to wiring diagram.
- Terminal -3- + socket 68
- Terminal -4- + socket 69
Wire resistance: max. 1.5 ohms

- Check wiring at harness connector terminals -3- + -4- for short circuit to terminals -1- + -2- according to wiring diagram.
Specified value: infinity ohms

If no wiring fault is detected:
- If no malfunction is found in the wiring, replace Engine Control Module (ECM).
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