Procedure
The control unit itself cannot be checked by home means. But in practice, there are very few problems here. An incomparably greater reason for complaints is given by sensors, switches and wire connections. Therefore, in case of a defect, it is recommended to proceed as follows:
If the check engine light comes on, have the fault memory interrogated in a workshop. Identify possible sources of failure in this way.
If the check engine light does not come on, but there is still a malfunction, then check if the ignition system is OK.
If the ignition is OK, check the fuel supply. If the defect is not found here, then:
Perform a visual inspection of the fuel injection system (see next section).
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