Circuit Description
WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
The Fuel Injector Control Module (FICM) monitors the Fuel Rail Pressure (FRP) sensor voltage, and the Fuel Rail Temperature (FRT) sensor voltage. The FRP and FRT sensor values, and diagnostic data, is communicated to the Powertrain Control Module (PCM) by 3 Pulse Width Modulated (PWM) circuits. This DTC sets when the PCM does not receive any PWM signals from the FICM.