Diagnostic Mode 05 - Read Oxygen Sensor Monitoring Test Results

Diagnostic Modes 01 - 09

Diagnostic Mode 05 - Read Oxygen Sensor Monitoring Test Results

The information provided in Modes 01 through 09 displays the various levels of emission related data that may be monitored, as well as the ability to retrieve and read stored DTC trouble codes, erase stored DTC trouble codes, generate readiness codes, and select the various PIDs and Test-IDs used within the modes to monitor the engine, and emission related component parameters.

• Mode 05 may not be supported on all systems. On systems where Diagnostic Mode 05 is not supported, refer to Diagnostic Mode 6 for Oxygen Sensor Monitoring Test Results. Diagnostic Mode 06 - Read Test Results For Specific Diagnostic Functions

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.

Prerequisite

• Coolant temperature must be at least 80°C => [ Diagnostic Mode 01 - Read Current System Data ] , Diagnostic mode 1: Check measured values; PID 5, Coolant temperature.

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".

Oxygen Sensor Signals, Output

- Select desired output of oxygen sensor signals "Test-ID XX".

*) V = Voltage in Volts (oxygen sensor signal)

**) t = Time in seconds

• 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".

- End diagnosis and switch ignition off.

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

If specified value is not obtained:

- Replace respective oxygen sensor:

• Heated Oxygen Sensor (HO2S) (G39), bank 1, refer to Repair Information

• Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130), bank 2, refer to Repair Information

• Heated Oxygen Sensor (HO2S) 2 (G108), bank 1, refer to Repair Information

• Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131), bank 2, refer to Repair Information.

- Erase DTC memory => [ Diagnostic Mode 04 - Erase DTC Memory ] , Diagnostic mode 4: Reset/erase diagnostic data.

- Generate readiness code => [ Readiness Code, Generating ] Monitors, Trips, Drive Cycles and Readiness Codes.

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

If specified value is not obtained:

- Replace respective oxygen sensor:

• Heated Oxygen Sensor (HO2S) (G39), bank 1, refer to Repair Information

• Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) (G130), bank 2, refer to Repair Information

• Heated Oxygen Sensor (HO2S) 2 (G108), bank 1, refer to Repair Information

• Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) (G131), bank 2, refer to Repair Information

- Erase DTC memory => [ Diagnostic Mode 04 - Erase DTC Memory ] , Diagnostic mode 4: Reset/erase diagnostic data.

- Generate readiness code => [ Readiness Code, Generating ] Monitors, Trips, Drive Cycles and Readiness Codes.

Evaluation test-ID 07: Minimum voltage at sensor for test cycle

If specified value is not reached:

• Short circuit to Ground (GND) or open circuit in wiring:

- Check oxygen sensor and oxygen sensor control:

Bank 1 sensor 1 and Bank 2 sensor 1 => [ Oxygen Sensor before Catalytic Converter, Checking Function ] Component Tests (VAG Code Tests), oxygen sensor and oxygen sensor control before catalytic converter, checking

Bank 1 sensor 2 and Bank 2 sensor 2 => [ Oxygen Sensor after Catalytic Converter, Checking Function ] Component Tests (VAG Code Tests), oxygen sensor and oxygen sensor control behind catalytic converter, checking

If specified value is exceeded:

• Oxygen sensor not ready for operation

• Oxygen sensor heater faulty:

- Check oxygen sensor heater:

Bank 1 sensor 1 and Bank 2 sensor 1 => [ Heater for Oxygen Sensor before Catalytic Converter, Checking ] Component Tests (VAG Code Tests), oxygen sensor heater for oxygen sensor before catalytic converter, checking

Bank 1 sensor 2 and Bank 2 sensor 2 => [ Heater for Oxygen Sensors after Catalytic Converter, Checking ] Component Tests (VAG Code Tests), oxygen sensor heater for oxygen sensor behind catalytic converter, checking

• Short circuit to B+ or open circuit in wiring:

- Check oxygen sensor and oxygen sensor control:

Bank 1 sensor 1 and Bank 2 sensor 1 => [ Oxygen Sensor before Catalytic Converter, Checking Function ] Component Tests (VAG Code Tests), oxygen sensor and oxygen sensor control before catalytic converter, checking

Bank 1 sensor 2 and Bank 2 sensor 2 => [ Oxygen Sensor after Catalytic Converter, Checking Function ] Component Tests (VAG Code Tests), oxygen sensor and oxygen sensor control behind catalytic converter, checking

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

If specified value is not reached:

• Oxygen sensor not ready for operation

• Oxygen sensor heater faulty:

- Check oxygen sensor heater:

Bank 1 sensor 1 and Bank 2 sensor 1 => [ Heater for Oxygen Sensor before Catalytic Converter, Checking ] Component Tests (VAG Code Tests), oxygen sensor heater for oxygen sensor before catalytic converter, checking

Bank 1 sensor 2 and Bank 2 sensor 2 => [ Heater for Oxygen Sensors after Catalytic Converter, Checking ] Component Tests (VAG Code Tests), oxygen sensor heater for oxygen sensor behind catalytic converter, checking

• Short circuit to Ground (GND) or open circuit in wiring:

- Check oxygen sensor and oxygen sensor control:

Bank 1 sensor 1 and Bank 2 sensor 1 => [ Oxygen Sensor before Catalytic Converter, Checking Function ] Component Tests (VAG Code Tests), oxygen sensor and oxygen sensor control before catalytic converter, checking

Bank 1 sensor 2 and Bank 2 sensor 2 => [ Oxygen Sensor after Catalytic Converter, Checking Function ] Component Tests (VAG Code Tests), oxygen sensor and oxygen sensor control behind catalytic converter, checking

If specified value is exceeded:

• Short circuit to B+ or open circuit in wiring:

- Check oxygen sensor and oxygen sensor control:

Bank 1 sensor 1 and Bank 2 sensor 1 => [ Oxygen Sensor before Catalytic Converter, Checking Function ] Component Tests (VAG Code Tests), oxygen sensor and oxygen sensor control before catalytic converter, checking

Bank 1 sensor 2 and Bank 2 sensor 2 => [ Oxygen Sensor after Catalytic Converter, Checking Function ] Component Tests (VAG Code Tests), oxygen sensor and oxygen sensor control behind catalytic converter, checking

Test ID 129 - Current Oxygen Sensor Voltage Value, Evaluating

If specified value is not reached:

- Replace engine control module.

Test ID 131 - Dynamic Value, Evaluating

If specified value is not reached:

• Oxygen sensor is aged:

- Replace the respective oxygen sensor:

• Bank 1, sensor 1 Heated Oxygen Sensor (HO2S) (G39), refer to Repair Information

• Bank 2, sensor 1 Heated Oxygen Sensor (HO2S) 2 (G108), refer to Repair Information