Principles of Operation

PRINCIPLES OF OPERATION

Charging system

This vehicle is equipped with a powertrain control module (PCM)-controlled charging system whereby the PCM determines the optimal voltage setpoint for the charging system and communicates this information to the voltage regulator. This system is unique in that it has 2 unidirectional communication lines between the PCM and the generator/regulator. Both of these communication lines are pulse-width modulated (PWM). The generator communication (GEN COM) line communicates the desired setpoint from the PCM to the voltage regulator while the generator monitor (GEN MON) line communicates the generator load and error conditions to the PCM. The third pin on the voltage regulator, the A circuit pin, is a dedicated battery voltage sense line.

Circuit Description

B+ Output Terminal Circuit 38 (RD)
Generator output voltage is supplied through the battery positive (B+) output terminal on the rear of the generator to the battery and the electrical system.

Circuit 35 (OG/LB)
This is the A terminal battery voltage sense circuit and is used to sense battery voltage.

Circuit 1816 (YE/LB)
This is the generator communication (GEN COM) circuit. The PCM determines the optimal voltage setpoint for the charging system and communicates the information to the voltage regulator via the GEN COM circuit.

Circuit 1817 (YE)
The generator monitor (GEN MON) circuit communicates the generator load and error conditions to the PCM.