Caution: The plug on the green wire to the control unit must not be shorted to ground.
Indicator (malfunction lamp) should flash 25 times per second. The control device will switch to the emergency parameter field, the lambda control will turn off.
Remove the seal of the adjustment screw CO "A". To do this, pierce it, screw in a suitable screw and then pull it out together with the seal.
Set the CO value with the adjusting screw using a screwdriver. The fan should not operate!
Note: If the LED (lamp) lights up despite the correct CO adjustment, it is possible that the Ecotronic control unit is not receiving a speed signal.
Insert new fillings.
Install the crankcase ventilation hose onto the cylinder head.
Note: If the CO content now increases, the reason is not incorrect adjustment, but rather enrichment of the mixture from the crankcase due to dilution of the oil by gasoline during short trips in cold weather.
With a longer trip, the gasoline content in the oil decreases and the CO content normalizes. This can be quickly achieved by a 30-minute trip or an oil change.
Stop the engine and turn off the tachometer.
Remove the CO measuring device from the measuring tube. Close the measuring tube.
Connect the lambda probe cable plug.
Remove the indicator LED lamp and auxiliary cable from the diagnostic plug.