- injection nozzles are controlled by the controller in pairs through two output stages (in system «Motronic ML4.1» one output stage controls all four injectors simultaneously);
- carbon monoxide content (SO) in the exhaust gases is automatically adjusted based on information from the oxygen concentration sensor;
- instead of a position type throttle position sensor, a resistive type sensor is installed;
- a controller with a higher speed was used, having a correspondingly different catalog number;
- the self-diagnosis system generates more fault codes.
Checking, adjusting and diagnosing the system «Motronic M1.5» performed in the same way as for the system «Motronic ML4.1» (see control values in subsection «Design and specifications»), with the exception of adjusting the CO content in the exhaust gases, which is automatically maintained at the required level by the controller commands. With an increased CO content, check the tightness of the engine air supply system and the serviceability of the spark plugs.
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