96 Jeep Grand Cherokee 5.2L V8: P0206 Injector Circuit Fault - Frayed Wire Fix & Code Not Clearing

I own a 1996 Jeep Grand Cherokee with a 5.2L V8 engine. Recently, I began experiencing rough acceleration at specific speeds, which led me to suspect either a spark or fuel injection issue causing misfires. I performed the classic 'turn key three times' trick and received the following diagnostic codes: - Code 27: Injector circuit not switching when commanded (TBI system) - Code 43: Problem in power module to logic module interface Using an OBD-II scanner, I obtained more detailed fault information: - P0138: Oxygen sensor circuit high voltage — Bank 1, Sensor 2 - P0206: Injector 6 control circuit problem (open or short) - P0306: Misfire detected in cylinder 6 I replaced all spark plugs (they were due), ran a fuel injector cleaner through the system, and traced the issue to a frayed wire in the electrical connector for cylinder #6. I replaced the cylinder 6 injector connector with a new pigtail connector. Immediately after, the misfire disappeared — idle and acceleration are now smooth. To reset the system, I disconnected the TPS and MAP sensors and performed the turn-key method three times. The OBD-II scanner then cleared all codes, and the check engine light went off. However, as soon as I restarted the engine, the check engine light returned. Upon re-scanning, only P0206 remains — and I cannot get it to clear permanently. My question: Does this require a system relearn period after repair? Or should I investigate further into the injector itself (e.g., internal failure or wiring continuity)? Any insights or troubleshooting tips would be greatly appreciated.