Preconditions for the test:
Engine running.
No faults stored.
Engine temperature above 85 °C.
All electrical loads switched off.
Gear selector set to ”P/N”.
No leaks in the exhaust system.
Note:
Used to test the lambda probe before the catalytic converter.
The basic setting procedure may take a few minutes.
Procedure:
Choose the function: Lambda probe before catalytic converter
Keep the engine speed between 2200 and 2800 rpm.
The diagnostic status field changes from ”Test off” to ”Test on”.
The temperature of the catalytic converter must be above 352 °C.
Read the oscillation time of the lambda probe before the catalytic converter. Prescribed value max. 2.2 seconds.
Maintain the engine speed until the diagnostic status field changes from ”Test on” to ”B1-S1 OK/ B1-S1 not OK”.