Preconditions for the test:
Engine running.
No faults stored.
Engine temperature above 80 °C.
Induction air temperature below 60 °C.
All electrical loads switched off.
Automatic gearbox set to ”P/N”.
Note:
Used to test the lambda probe before the catalytic converter.
Procedure:
Choose the function: Lambda probe before catalytic converter.
Keep the engine speed between 1800 and 2200 rpm.
The temperature of the catalytic converter must be at least 350 °C.
The diagnostic status field changes from ”Test off” to ”Test on”.
Maintain the engine speed until the diagnostic status field changes from ”Test on” to ”B1-S1 OK/ B1-S1 not OK”.
Read the oscillation curve of the lambda probe before the catalytic converter. Prescribed value max 1.99 seconds.