Your alternator may be controlled by the PCM, engine computer.
The problem will not be the PCM but the wiring going beween the lalternator and the PCM. Check the condition of the connector at the alternator for corrosion and pin damage and for a broken wire near the connector. I assume the Alternator light is on. I assume you cleaned battery terminal connections too.
From the shop manual:Charging System
This vehicle is equipped with a powertrain control module (PCM) controlled "smart charge" charging system. The PCM-Controlled Charging System is a system whereby the PCM determines the optimal voltage setpoint for the charging system and communicates this information to the voltage regulator. The PCM-Controlled Charging System is unique in that it has two uni-directional communication lines between the PCM and the generator/regulator. Both of these communication lines are pulse-width modulated. The GEN COM line communicates the desired setpoint from the PCM to the voltage regulator and the GEN MON line communicates the alternator load condition to the PCM. The third pin on the voltage regulator, the A circuit pin, is a dedicated battery voltage sense line.
--------------------------------------------------------------------------------------------------Terminal A Alt B+ Batt Eng to Bat Gnd Key OFF 12V 12V 12V 0V Key on - engine off 12V 12V 12V 0V Engine running 13- 15V 13- 15V 13- 15V 0V
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Possible causesA Circuit 35 (OR/LB).
A Circuit fuse link.
B+ Circuit 36 (YE/WH).
B+ Circuit fuse links.
Generator.
PCM
GEN-COM Circuit 586 (RD/PK).
GEN-MON Circuit 585 (VT).
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