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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 452 (Engine Controls - Self-Diagnostics - 6.0L Bi-Fuel & CNG) >> Diagnostic Tests >> DTC P1207: Fuel Rail Pressure Output PWM Signal Not Received By Pcm >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The Fuel Injector Control Module (FICM) monitors the CNG Fuel Tank Pressure (FTP) sensor, the Fuel Tank Temperature (FTT) sensor, and the Fuel Rail Temperature (FRT) sensor. The FTP, FTT, and FRT sensor values, and FICM diagnostic status, is communicated to the Powertrain Control Module (PCM) by 2 Pulse Width Modulated (PWM) circuits. This DTC sets when the sensor value PWM output signal is not received by the PCM.

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