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:
Aging diagnosis of the lambda sond.
See readiness test.
Procedure:
Choose the function Lambda regulation, probe before catalytic converter
Engine speed 2200…2800 rpm.
The lambda sond status changes from ”Test off” to ”Test on”.
The temperature of the catalytic converter must be at least 352 °C.
Check the oscillation time of the lambda sond. Prescribed value max 2.2 seconds.
Maintain the engine speed until the lambda sond status shows ”B1-S1 OK! / B1-S1 not OK!”.