Circuit Description

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

The "F" terminal inputs to the PCM to indicate percentage of total capacity that the generator is producing. The signal is detected by the PCM as a duty cycle from the generator and displayed on scan tool as a percentage. PCM can monitor the generator's output under all conditions to determine if it is functioning normally.

A low duty cycle percentage is displayed when there is low demand on generator. A high load on generator will indicate a duty cycle close to 100 percent. A normally functioning generating system will never reach a 100 percent duty cycle, as indicated on scan tool.

Conditions for setting DTC are: "F" terminal indicates a duty cycle not between 10 and 40 percent with ignition on and engine off or duty cycle is less than 5 percent with engine running and conditions met for 6 seconds.