Circuit Description

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The powertrain control module (PCM) controls fuel delivery and determines fuel system operation on bi-fuel (KL6) vehicles. The PCM is not capable of operating the high current compressed natural gas (CNG) fuel injectors. The PCM injector control signals are received by the fuel injector control module (FICM) and duplicate control signals are generated by the FICM in order to operate the CNG injectors. On bi-fuel equipped vehicles, the FICM switches off the CNG fuel injectors and re-routes the injector control signals from the PCM to the gasoline fuel injectors. A fused ignition voltage is supplied to all of the fuel injectors. The PCM monitors the status of each injector control circuit. DTC P0200 will set if there is condition on a control circuit between the PCM and FICM. On bi-fuel (KL6) vehicles, DTC P0200 can set during gasoline operation, if a circuit condition is detected between the AF injector relay and a gasoline fuel injector.