To carry out the adjustment, the ignition timing must be correctly set, which for the described engines with a characteristic stored in the memory, usually does not change. The idle speed stabilization system must operate (the valve rings and vibrates when the ignition is on). As a rule, for engines, the nominal idle speed is 700-90 rpm, the CO content is 1.0±0.5% vol.
Preparatory actions
First you need to interrogate the memory of the self-diagnosis system.
If there is no error message, the ignition timing and CO content should be checked. Idle speed can only be controlled, not adjusted.
To adjust the CO content, use the hexagon socket screw on the air quantity meter (remove the blue cap). When screwing in, the CO content decreases, when twisting it increases.
Attention. When turning the adjustment screw, it is hardly blowing to be careful. The screw must not be lifted or pushed down. While the adjustment key is installed, do not give "gas", otherwise the key may be bent. After each adjustment step, remove the key and let it "gas" reading the CO value on the instrument.
The engine must be warmed up to a coolant temperature of at least 80°C.
Measuring devices should be connected with the ignition off.
Connect the CO probe to the CO outlet tube.
When carrying out the test, do not turn on the consumers of electric current and the air conditioner.
Attention: The plugs of the self-diagnosis system are located under the collar of the gear lever. There are four connectors on a vehicle with ABS. Only three of them belong to the KE-Motronic system.
1 Blue
2 Brown
4. Black. The brown plug marked 3 is used to test the LAN system
Adjustment
Start the engine and read the measured value.
If codes 2-3-4-3 or 2-3-4-4 appear when polling the memory of the self-diagnosis system. CO content needs to be adjusted.
Disconnect the crankcase ventilation hoses. as described in paragraph "Preparatory actions".
Disconnect the hose from the pressure regulator in the mixture regulator and install an adapter cable between the plug and the pressure regulator. As a last resort, make the cable yourself.
Connect an ammeter set to the milliamp measurement range to the measuring plug of the adapter cable.
Turn on the ignition, the current value should be 90-11 mA. When measuring in the opposite direction, change the polarity of the conductors.
Start the engine and let it idle.
Set the current value to 2.5±2.5 mA using the CO adjustment screw.
The measured value must fluctuate, otherwise the lambda control does not work.
After completing the adjustment, reset the memory of the self-diagnosis system.
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