LEMON Manuals: Even more car manuals for everyone
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 P1209: FICM Diagnostic 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 FICM diagnostic status PWM signal is not received by the PCM.

scientia non olet · About LEMON Manuals