Test condition:
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:
The diagnosis will only be initiated if the Lambda probe ageing diagnosis is first successfully completed.
Procedure:
Start the function.
Increase the engine speed to 1800-2200 rpm.
The temperature of the catalytic converter must be above 350 °C.
The diagnostic status field will change from ”Test off” to ”Test on”.
Amplitude ratio max 0.4.
Read off the value columns diagnosis status must change from ”Test on” to "Cat B1 OK"
If the specifications are not attained, interrogate fault memory.
Exit function.