Note: For vehicles with a catalytic converter, the CO concentration is not regulated.
Test conditions: Check the exhaust system. To do this, cover the end of the exhaust pipe with a rag. All pipe connections must remain tight.
Warning: Ensure good ventilation of the work area. There is a risk of poisoning.
Start and warm up the engine. The engine oil temperature should be at least 80°C.
Check the idle speed.
Turn off all electrical consumers.
Caution: Connect measuring instruments only when the ignition is switched off.
Connect the tachometer according to the instructions.
Attach a CO monitoring device to the end of the exhaust pipe.
Let the engine idle.
Set and maintain the speed at 2500 rpm for two minutes.
Maintain idle speed for three minutes to stabilize exhaust gas parameters.
Measure the concentration of CO. The concentration should be in volume %.
Vehicles with a catalytic converter: CO concentration is not regulated. If the CO concentration deviates from the specified value, see the injection system fault diagnostics.
Vehicles without catalytic converter: Remove the plug from the mixture adjustment screw and adjust the CO concentration by turning the adjustment screw in the potentiometer. If the CO concentration does not change, see the injection system fault diagnosis.
If the cause of the malfunction cannot be determined, you should contact a specialized workshop.
Disconnect the measuring instruments with the ignition off.