Test condition:
Engine running
No faults stored
No leaks in the exhaust system
All electrical loads switched off
Coolant temperature at least 80 °C
The temperature of the catalytic converter at least 440 °C
Note:
Used to test the catalytic converter effectiveness.
Procedure:
Start the function.
Increase engine speed to 2000rpm.
Test may take several minutes
The status field will change from "Test off" to "Test on"
Maintain the engine speed until the diagnostic status field shows "Cat B1 ok /Cat B1 not ok"
Efficiency should be more than 1.0
If the specifications are not attained, interrogate fault memory.
Exit function.