Diagnostic Mode 5: Check Output of Oxygen Sensor Signals

Diagnostic mode 5: Check output of oxygen sensor signals

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

Requirements
- There must not be any DTCs stored in DTC memory, Diagnostic mode 3: Check DTC memory. Diagnostic Mode 3: Check DTC Memory
- Coolant temperature must be at least 80 degrees C, Diagnostic mode 1: Check measuring values; PID 5, Coolant temperature. Diagnostic Mode 1: Check Measuring Values

Procedure
- Connect diagnostic tester. Diagnostic Tester, Connecting
- 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".

Output of oxygen sensor signals

- Select desired output of oxygen sensor signals "Test-ID XX".
*) V = Voltage in volts (oxygen sensor signal)
**) t = Time in seconds

Test-ID Diagnostic test
01: Rich to lean sensor barrier voltage
02: Lean to rich sensor barrier voltage
03: Lower voltage for shift time calculation (lean)
04: Upper voltage for shift time calculation (rich)
05: Calculated rich-lean shift time
06: Calculated lean-rich shift time
07: Minimum voltage at sensor for test cycle
08: Maximum voltage at sensor for test cycle
09: Time period between sensor shift procedures

NOTE:
- Bank 1 = Cylinder bank 1, in direction of travel, right
- Bank 2 = Cylinder bank 2, in direction of travel, left
- When selecting the diagnostic mode, the entry is always performed in "Bank 1 sensor 1".
- If either the VAG1551/1552 Scan Tool (ST) or 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 button 1, 2, 5 and 6:
- Button 1 = Bank 1 sensor 1,
- Button 2 = Bank 1 sensor 2,
- Button 5 = Bank 2 sensor 1,
- Button 6 = Bank 2 sensor 2.

- End diagnosis and switch ignition off.

Evaluation test-ID 01: Rich to lean sensor barrier voltage

Test - ID 01:

If specified value is not obtained:
- Replace the respective oxygen sensor:
- Bank 1 sensor 1 (Heated Oxygen Sensor (HO2S) -G39-), Item 1
- Bank 1 sensor 2 (Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-), Item 4
- Bank 2 sensor 1 (Heated Oxygen Sensor (HO2S) 2 -G108-), Item 15
- Bank 2 sensor 2 (Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131-), Item 11
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

Evaluation test-ID 02: Lean to rich sensor barrier voltage

Test - ID 02:

Test - ID 07:

If the specified value is not reached:
- Short circuit to Ground (GND) in oxygen sensor or in wire:
- Check oxygen sensor and oxygen sensor control:
- Bank 1 sensor 1 and Bank 2 sensor 1, oxygen sensor and oxygen sensor control before catalytic converter, checking
- Bank 1 sensor 2 and Bank 2 sensor 2, oxygen sensor and oxygen sensor control behind catalytic converter, checking

If the specified value is exceeded:
- Oxygen sensor not ready for operation
- Oxygen sensor heater malfunctioning:

- Check oxygen sensor heater:
- Bank 1 sensor 1 and Bank 2 sensor 1, oxygen sensor heater for oxygen sensor before catalytic converter, Oxygen Sensor Heater For Oxygen Sensors Before Catalytic Converter, Checking
- Bank 1 sensor 2 and Bank 2 sensor 2, oxygen sensor heater for oxygen sensor behind catalytic converter, [1][2]Oxygen Sensor Heater For Oxygen Sensors Behind Three Way Catalytic Converter (TWC), Checking

- Short circuit to B+ or open circuit in wiring in oxygen sensor or in wire:

- Check oxygen sensor and oxygen sensor control:
- Bank 1 sensor 1 and Bank 2 sensor 1, oxygen sensor and oxygen sensor control before catalytic converter, checking
- Bank 1 sensor 2 and Bank 2 sensor 2, oxygen sensor and oxygen sensor control behind catalytic converter, checking

Evaluation test-ID 08: Maximum voltage at sensor for test cycle

Test - ID 08:

If the specified value is not reached:
- Oxygen sensor not ready for operation
- Oxygen sensor heater malfunctioning:

- Check oxygen sensor heater:
- Bank 1 sensor 1 and Bank 2 sensor 1, oxygen sensor heater for oxygen sensor before catalytic converter, Oxygen Sensor Heater For Oxygen Sensors Before Catalytic Converter, Checking
- Bank 1 sensor 2 and Bank 2 sensor 2, oxygen sensor heater for oxygen sensor behind catalytic converter, [1][2]Oxygen Sensor Heater For Oxygen Sensors Behind Three Way Catalytic Converter (TWC), Checking

- Short circuit to Ground (GND) or open circuit in wiring in oxygen sensor or in wire:

- Check oxygen sensor and oxygen sensor control:
- Bank 1 sensor 1 and Bank 2 sensor 1, oxygen sensor and oxygen sensor control before catalytic converter, checking
- Bank 1 sensor 2 and Bank 2 sensor 2, oxygen sensor and oxygen sensor control behind catalytic converter, checking

If the specified value is exceeded:
- Short circuit to B+ in oxygen sensor or in wire:

- Check oxygen sensor and oxygen sensor control:
- Bank 1 sensor 1 and Bank 2 sensor 1, oxygen sensor and oxygen sensor control before catalytic converter, checking
- Bank 1 sensor 2 and Bank 2 sensor 2, oxygen sensor and oxygen sensor control behind catalytic converter, checking

Evaluation test-ID 09: Time period between sensor shift procedures

Test - ID 09:

If the specified value is not reached:
- Short circuit in oxygen sensor or in wire:

- Check oxygen sensor and oxygen sensor control:
- Bank 1 sensor 1 and Bank 2 sensor 1, oxygen sensor and oxygen sensor control before catalytic converter, checking

If the specified value is exceeded:
- Oxygen sensor malfunctioning:
- Check oxygen sensor and oxygen sensor control, oxygen sensor and oxygen sensor control before catalytic converter, checking.