Preconditions for the test:
Engine running.
No faults stored.
Engine temperature above 85 °C.
No leaks in the exhaust system.
All electrical loads switched off.
Gear selector set to P/N.
Note:
Used to see the aging factor of the lambda probe (oscillation response). If it is too high, the probe is worn out.
During basic setting, the AC compressor is switched off and the carbon canister valve is closed.
The basic setting procedure may take a few minutes.
Procedure:
Choose the function: Lambda probe before catalytic converter
Keep the engine speed between 2300 and 2800 rpm.
Diagnostic status changes from ”Test off” to ”Test on”.
Read the lambda probe 1, bank 1 aging factor. Prescribed value: 0.5 till 2.5.
Maintain the engine speed until diagnostic status changes from ”Test on” to ”B1-S1 OK! / B1-S1 not OK!”.
On completion of basic setting, the AC compressor and carbon canister valve are activated automatically.