Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
System Description: Description
The engine on energy management function ensures the stability of the on-board electrical system as well as an even charge balance in battery.
Given that the power output of the alternator is dependent on engine speed and temperature, plus the fact that many consumers are used simultaneously, overload situations arise that need to be buffered by the battery. When such an overload situation lasts for an extended period or when the charging capacity of the battery is low, a negative charge/discharge ratio may result that may impair the engine's starting capability.
In situations where the on-board electrical system is overloaded for prolonged periods, engine ON energy management works to increase the power output of the alternator and also reduces the consumers for balancing the charge/discharge ratio of the battery.
Energy management for driving includes the following sub functions:
- Function sequence for voltage provision
- Function sequence for dynamic idle speed control
- Function sequence for consumer reduction
- Function sequence for power supply over sub battery
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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