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.
Depress brake pedal.
Raise engine speed to 1500-4000rpm.
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.