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.
Dual-Injection Fuel Delivery System: Overview
The dual-injection fuel delivery system consists of a fuel select switch (FSSW) circuit, the fuel rails, the fuel injectors, and a fuel injector interface module.
The fuel injector interface module controls the fuel injectors according to the demand from the powertrain control module (PCM). The fuel injector interface module enables the primary (forward) fuel injectors when in single-injection mode and enables both the primary (forward) and secondary (rearward) fuel injectors when in dual-injection mode. The injection mode is requested by the PCM through the FSSW circuit. The fuel injector interface module communicates the fuel injection mode status to the PCM on the communications network.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.