2. Turn off the ignition and connect the MUT-II device to the diagnostic connector.
3. Check the basic setting of the ignition advance angle, which should correspond to the nominal value.
Setting the ignition advance angle: 5°±3° before TDC
4. Start the engine and increase the engine speed to 2500 min⁻¹ for 2 minutes.
5. Install the gas analyzer probe (CO and CH) into the exhaust pipe.
6. With the engine idling, measure the concentrations of CO and CH, which should correspond to the nominal values.
- cO concentration: no more than 0.5%;
- cH concentration: no more than 100 ppm.
Note: These tests must be performed within 4 minutes of the engine idling.
Acceptable values:
- cO concentration: not more than 0.5%
- cH concentration: no more than 100 ppm.
7. If the concentration of CO and CH is not within the acceptable limits, check the following:
- diagnostic codes,
- fuel pressure;
- fuel injectors;
- coil and spark plugs;
- eGR system and valve;
- fuel vapor recovery system;
- compression in engine cylinders
Note: If the CO and HC concentrations are not within the acceptable limits even with all positive tests, replace the three-way catalytic converter.