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.
Direct Injection System Control: Notes
A high pressure fuel injector control module (HDEV) is used for each cylinder bank and is located in the engine compartment E box. The HDEV control module is supplied with system voltage from the ECM main relay (in the IVM). Data is transmitted from the ECMs to the HDEV control modules for each high pressure fuel injector via the Local-Can bus. The HDEVs activate the injectors individually.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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