Powertrain Control Module (PCM)

Current Gear:  Displays current gear position of the transmission

TCC Brake Switch:  Displays ON or OFF status of the TCC Brake switch.

TR Sw. A/B/C/P:  Displays LOW or HI for the state of each of the four inputs from the IMS. LOW displayed indicates a low voltage signal (0 volts) being monitored at the PCM. Hi displayed indicates a high voltage signal (B+) being monitored at the PCM.