Dual-Injection Fuel Delivery System

Dual-Injection Fuel Delivery System

Overview

The dual-injection fuel delivery system consists of a fuel select switch circuit the fuel rails the fuel injectors and a fuel injector control module (FICM).

The FICM controls the fuel injectors according to the demand from the powertrain control module (PCM). The FICM 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 fuel select switch circuit. The FICM communicates the fuel injection mode status to the PCM on the SCP network.

Fuel Select Switch Circuit

The fuel select switch (FSSW) circuit is used by the PCM to toggle between single-injection and dual-injection fuel modes. When torque demand reaches a calibrated limit the PCM requests the secondary injectors by toggling the FSSW circuit.

Fuel Rails

The fuel rails route fuel to the fuel injectors






Fuel Injectors

The dual-injection fuel delivery system uses 2 injectors per cylinder paired together. The primary injectors are slightly forward of the secondary injectors.






Fuel Injector Control Module (FICM)

The FICM receives input from the PCM. Based on the information received and programmed into its memory the FICM generates output signals to control the injector solenoids. The FICM contains a set of drivers for both the primary (forward) and secondary (rearward) fuel injectors. Fuel injector driver signals from the powertrain control module (PCM) are used to control both sets of output drivers in the FICM. Based on the fuel selector switch input the FICM controls either the primary or both the primary and secondary fuel injectors.