Preconditions for the test:
Engine running.
No faults stored.
Engine temperature above 80 °C
Intake air temperature below 60°C
No leaks in the exhaust system.
All electrical loads switched off.
Gear selector set to P/N.
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.
Engine speed between 2300 and 2500 rpm.
The temperature of the catalytic converter must be between 550 and 700°C.
The diagnosis status field changes from ”Test off” to ”Test on”.
Maintain engine speed until the diagnosis status field changes from ”Test on” to ”Cat B1 OK! / Cat B1 not OK!”.