Preconditions for the test:
Engine running.
No faults stored.
All electrical loads switched off.
Gear selector set to P/N.
Induction air temperature below 60 °C.
No leaks in the exhaust system.
Note:
For diagnosis of catalytic converter efficiency.
This diagnosis is initiated only when the lambda probes have been tested and are OK.
Procedure:
Choose the function: Catalytic converter diagnosis.
Let the engine idle.
The temperature of the catalytic converter must be above 440 °C.
The diagnostic status field changes from ”Test off” to ”Test on”.
Maintain the idling speed until the diagnostic status field changes from ”Test on” to ”Cat B1 OK! / Cat B1 not OK!”.
Read the catalytic converter efficiency. Prescribed value max. 0.30.