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.