Test condition:
Engine running.
No faults stored.
Engine temperature above 80 °C.
No leaks in the exhaust system.
All electrical loads switched off.
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 probe after catalytic converter
Maintain the engine speed at 3000 rpm until the exhaust temperature reaches 250 °C. Restore idling. Press and hold down the brake pedal. (Within a few seconds the engine control unit will raise the engine speed to 1400 rpm.
The diagnostic status field will change from ”Test off” to ”Test on”.
Read off the value columns. Required result:
Lambda sond (bank 1, sond 2) 0.1 to 0.95V;
diagnosis status must change from ”Test on” to B1-S2 OK!/ B1-S2 not OK!
On completion of basic setting, the carbon canister valve is activated automatically.