Circuit Description

The L-terminal circuit No. 225 is a 2-way link between the PCM and generator. The PCM supplies the generator with 5 volts whenever the ignition is ON. The PCM will not supply 5 volts to the generator during engine cranking if battery voltage is below 9.6 volts. Once engine is running, generator must have the 5-volt supply to charge. If generator stops charging while engine is running, it will ground this 5-volt supply from PCM. When PCM detects this ground, it will send a message to the I/P cluster over the Class II link to illuminate the charge telltale. The PCM determines electrical system load by monitoring the generator Pulse Width-Modulated (PWM) output on the F-terminal circuit No. 23.