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:
For diagnosis of catalytic converter efficiency.
This diagnosis is initiated only when the lambda probes and activated charcoal filter system have been tested and are OK.
Procedure:
Start the function.
Increase the engine speed to 1800-2200 rpm.
The temperature of the catalytic converter must be above 300 °C.
The diagnostic status field will change from ”Test off” to ”Test on”.
Test may take several minutes.
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.