Test condition:
Engine running.
No faults stored.
Engine temperature above 80 °C.
No leaks in the exhaust system.
All electrical loads switched off.
Exhaust temperature above 350 °C.
Note:
Used to test the lambda sond after the catalytic converter.
During basic setting, the AC compressor is switched off and the carbon canister valve is closed.
Procedure:
Choose the function: lambda regulation, after catalytic converter.
Keep the engine speed between 1800 and 2200 rpm.
The diagnostic status field will change from ”Test off” to ”Test on”.
Read off the value columns. Required result: lambda sond (bank1, sond2) 0.1 to 0.9 V; lambda regulation, sond before catalytic converter (delay) -150 to 150 ms; diagnosis status must change from ”Test on” to System OK!/System not OK!