Fuel Injector Control Module Description: Notes

The fuel injector control module (FICM) is a non-flashable control module that is not capable of serial data communication.

The FICM performs the following tasks:

• internally routes the powertrain control module (PCM) injector control circuits to the CNG injector drivers or the gasoline injectors (KL6 only)
• operates the CNG injectors based upon the PCM injector signals
• supplies the reference, ground and signal circuits to the fuel rail pressure (FRP) sensor (w/o JL4)
• supplies the ground and signal circuits to the fuel rail temperature (FRT) sensor
• communicates the FRP sensor values to the PCM using a dedicated PWM circuit (w/o JL4)
• communicates the FRT sensor values to the PCM using a dedicated PWM circuit
• communicates FICM, FRT and FRP (w/o JL4), diagnostic information to the PCM using a dedicated PWM circuit

The PCM controls fuel delivery and determines fuel system operation on Bi-fuel (KL6) equipped vehicles. The PCM monitors various engine and vehicle functions to provide the correct amount of CNG or gasoline fuel under all operating conditions. The fuel injector control circuits, an AF Enable circuit and PWM communication circuits connect the PCM to the FICM. The PCM is not capable of operating the high current CNG fuel injectors. The PCM injector pulse width signals are received by the FICM and duplicate pulse width signals are generated by the FICM in order to operate the CNG injectors. KL6 equipped vehicles utilize a FICM that contains internal relays. When operating on gasoline the internal relays allow the PCM injector pulse width to go directly to the gasoline injectors.