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.
Fuel Pump
The central electronic module (CEM) (4/56) receives a request to start the fuel pump from the engine control module (ECM) (4/46) via CAN network. The central electronic module (CEM) then activates an internal relay that supplies power to the fuel pump unit (4/83), which in turn powers the fuel pump (6/33).
If the CAN network does not function the relay for the power supply to the fuel pump control module will not be activated.
In the event of a collision in which the airbags are deployed, a signal is transmitted from the supplemental restraint system (SRS) module (4/9) to the central electronic module (CEM) via the CAN network. The central electronic module (CEM) deactivates the relay for the fuel pump unit.
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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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