Test condition:
Engine running
No faults stored
No leaks in the exhaust system
All electrical loads switched off
Coolant temperature at least 80 °C
Note:
Used to test the lambda probe after the catalytic converter.
Procedure:
Start the function.
For vehicles to 04.01:
Raise idling speed
The status field will change from "Test off" to "Test on"
Test may take several minutes
Maintain the engine speed until the status field changes from "Test on" to "B1-S2 OK/B1-S2 not OK"
For vehicles from 05.01:
Depress brake- and throttle pedal
The engine speed will raise by the engine control module to 1800-2200 rpm
The status field will change from "Test off" to "Test on"
Test may take several minutes
Maintain the engine speed until the status field changes from "Test on" to "B1-S2 OK/B1-S2 not OK"
If the specifications are not attained, interrogate fault memory.
Exit function.