Catalytic Converter: Testing and Inspection

Three Way Catalytic Converters (TWC), Checking

Function
This diagnostic mode displays the test results of emission relevant components and systems which are not continuously monitored.

The values of the test results must reach the specified value or must be within the min.- and max.- limits.

Test-ID Components Test
01: Catalytic converter monitoring

Test-ID 01: Catalytic converter

Test requirement
- Coolant temperature must be at least 80 degree C, Diagnostic mode 1: Check measured values; PID 5, Coolant temperature.

Procedure
- Connect diagnostic tester Scan Tool Connecting
- Perform a 15 minute road test in the highest gear or in the highest driving mode on a level driving surface.

The following operating conditions must be met during this road test:
- Engine speed approx. 1800 to 2200 RPM, Diagnostic mode 1: Check measuring values; PID 12, engine rotations per minute (RPM)
- Vehicle speed constant 90 km/h, Diagnostic mode 1: Check measuring values; PID 13, Vehicle speed

Observe the safety precautions that apply to road tests.

- Let engine run at idle.
- Under address word 33, select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
- Select the "Test-ID 01: Catalytic converter" off.
- Check specified values at idle.

Test-ID 01:

NOTE:
- Bank 1 = Cylinder bank 1, in direction of travel, right
- Bank 2 = Cylinder bank 2, in direction of travel, left

- End diagnosis and switch ignition off.

If the specified values are exceeded:
- Replace the respective exhaust pipe with catalytic converter.