Test condition:
Engine running.
No faults stored.
No leaks in the exhaust system.
All electrical loads switched off.
Gear selector set to P/N.
Note:
For diagnosis of catalytic converter efficiency.
Procedure:
Choose the function: Catalytic converter diagnosis, cylinder bank 1.
Press and hold down the brake pedal.
Press the throttle pedal fully down.
The engine control unit increases the engine speed to about 1800 rpm.
The diagnostic status field will change from ”Test off” to ”Test on”.
The temperature of the catalytic converter must be above 350°C.
Maintain the engine speed until the diagnostic status field changes from ”Test on” to ”Cat B1 OK! / Cat B1 not OK!”.