Diagnosis - Aw-4: Description
The electronic control system for the AW-4 transmission controls transmission shift points and torque converter lock-up. Electronic control system consists of Transmission Control Module (TCM), valve body solenoids, throttle position sensor, speed sensor, neutral safety switch and brake switch.
NOTE:
Transmission Control Module (TCM) may be referred to as Transmission Control Unit (TCU). Neutral safety switch may be referred to as park/neutral safety switch or gear select switch.