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 the individual oxygen sensor test results must reach the 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. 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 measured values; PID 5, Coolant temperature. Diagnostic Mode 1: Check Measuring Values
Work 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".
Test-ID: Evaluation of output of oxygen sensor signals
01 Rich to lean sensor barrier voltage
02 Lean to rich sensor barrier voltage
07 Minimum voltage at sensor for test cycle
08 Maximum voltage at sensor for test cycle
- End diagnosis and switch ignition off.
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 the Vehicle Diagnostic, Testing and Information System VAS 5051 or the Vehicle Diagnostic and Information System VAS 5052 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.
Evaluation test-ID 01: Rich to lean sensor barrier voltage
If specified values are not obtained:
- Replace the respective oxygen sensor:
- Heated Oxygen Sensor (HO2S) -G39-
- Heated Oxygen Sensor (HO2S) 2 -G108
- Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-
- Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131-.
- Erase DTC memory of Engine Control Module (ECM). Diagnostic mode 4: Reset/erase diagnostic data. 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
If specified values are not obtained:
- Replace the respective oxygen sensor:
- Heated Oxygen Sensor (HO2S) -G39-
- Heated Oxygen Sensor (HO2S) 2 -G108-
- Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-,
- Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131-.
- Erase DTC memory of Engine Control Module (ECM). Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
Evaluation test-ID 07: Minimum voltage at sensor for test cycle
If the specified value is not reached:
- Short circuit to Ground (GND) in oxygen sensor or in wire:
- Check Oxygen Sensors (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 malfunctioning:
- Check oxygen sensor heater for Oxygen Sensors (O2S) behind Three Way Catalytic Converter (TWC). 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 Sensors (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC).
Evaluation test-ID 08: Maximum voltage at sensor for test cycle
If the specified value is not reached:
- Oxygen sensor not ready for operation
- Oxygen sensor heater malfunctioning:
- Check oxygen sensor heater for oxygen sensors before Three Way Catalytic Converter (TWC). Oxygen Sensor Heater For Oxygen Sensors Before Catalytic Converter, Checking
- Check oxygen sensor heater for Oxygen Sensors (O2S) behind Three Way Catalytic Converter (TWC). 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 Sensors (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC).
- Check Oxygen Sensors (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 Sensors (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC).
- Check Oxygen Sensors (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC).