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.
Engine Status And Engine Speed (Rpm)
The engine control module (ECM) (4/46) provides information about engine status and engine speed via the controller area network (CAN). This information is used to activate the pump motor when the engine is started.
Vehicles equipped with the function automatic start/stop of engine will also use the information from Engine control module (ECM) and Central electronic module (CEM) (4/56) to decide if the vehicle is in position autostop.
If the vehicle is in position autostop, the pump motor will be deactivated. The pump motor is reactivated when the engine is started again.
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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.