Diagnostic Mode 5: Check Output of Oxygen Sensor Signals

Diagnostic mode 5: Check output of oxygen sensor signals

Note: This diagnostic mode can only be selected with Module number 10 - Engine Electronics.

Function
The static values of the oxygen sensors are indicated via this diagnostic mode.
The values of individual oxygen sensor test results must reach specified value or must be within the min.- and max.- limits.

Requirements
- Exhaust system must be properly sealed between catalytic converter and cylinder head.
- There must not be any DTCs stored in DTC memory.
- Coolant temperature must be at least 80°C.

Procedure
- Connect diagnostic tester.
- Start engine and let run at idle.
- Under address word 33, select "Diagnostic mode 5: Check output of oxygen sensor signals".
- Select the desired output of oxygen sensor signals "Test-ID XX".

Note: - When selecting the diagnostic mode, the entry is always performed in "Bank 1 sensor 1".
- If either the V.A.G 1551/1552 Scan Tool (ST) or the VAS5051/5052 Vehicle Diagnostic, Testing and Information System is used for checking the output of oxygen sensor signals, the respective oxygen sensor can be selected by pressing buttons 1 and 2:

- Button 1 = Bank 1 sensor 1,
- Button 2 = Bank 1 sensor 2.

Test-ID: Evaluation of output of oxygen sensor signals
07 Bank 1, sensor 1 and 2: Minimum voltage at sensor for test cycle
08 Bank 1, sensor 1 and 2: Maximum voltage at sensor for test cycle
09 Bank 1, sensor 1: Time period between sensor shift procedures

- End diagnosis and switch ignition off.

Evaluation test-ID 07: Minimum voltage at sensor for test cycle
Oxygen sensor Specified value:
min max
Bank 1 sensor 2 0.005 V 0.400 V
Bank 2 sensor 2 0.005 V 0.400 V

If the specified value is not reached:
Short circuit to Ground (GND) in oxygen sensor or in wire:
- Check Oxygen Sensor (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC).
- Check Oxygen Sensor (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC).

If the specified value is exceeded:
Oxygen sensor not ready for operation
Oxygen sensor heater faulty:
- Check oxygen sensor heater for Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC).
- Check oxygen sensor heater for Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC).

Short circuit to B+ or open circuit in wiring in oxygen sensor or in wire:
- Check Oxygen Sensor (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC).
- Check Oxygen Sensor (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC).

Evaluation test-ID 08: Maximum voltage at sensor for test cycle
Oxygen sensor Specified value:
min max
Bank 1 sensor 2 0.005 V 0.950 V
Bank 2 sensor 2 0.005 V 0.950 V

If the specified value is not reached:
Oxygen sensor not ready for operation
Oxygen sensor heater faulty:
- Check oxygen sensor heater for Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC).
- Check oxygen sensor heater for Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC).

Short circuit to Ground (GND) or open circuit in wiring in oxygen sensor or in wire:
- Check Oxygen Sensor (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC).
- Check Oxygen Sensor (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC).

If the specified value is exceeded:
Short circuit to B+ in oxygen sensor or in wire:
- Check Oxygen Sensor (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC).
- Check Oxygen Sensor (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC).

Evaluation test-ID 09: Time period between sensor shift procedure
Oxygen sensor Specified value:
min max
Bank 1 sensor 2 0.00/s 10.00/s
Bank 2 sensor 2 --- ---

If the specified value is exceeded:
Oxygen sensor faulty:
- Check Oxygen Sensor (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC).