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The AW-4 is a four speed, electronically controlled automatic transmission. Running gear consists of a lock-up converter:oil pump:three planetary gear sets:clutch and brake units:hydraulic accumulators:a valve body with electric solenoids and a transmission computer unit (TCU). Cables are used for shifting and throttle pressure control. A neutral safety switch permits engine starting in Park and Neutral range only. The valve body solenoids -are controlled by signals from the TCU. Signal sequence is determined by vehicle speed and throttle position. Fourth gear is an .70:1 ratio overdrive range. First second,third and reverse gear are conventional ranges. Third gear ratio is 1:1. A separate planetary gear set provides overdrive operation in fourth gear. Section index: Transmission system, diagnosis, troubleshooting, transmission service, transmission and torque converter removal, transmission overhaul, sub-assembly overhaul, valve body teardown, transmission assembly.
Tags : automatic transmission service, planetary gear set, electric solenoids, neutral safety switch, system diagnosis, torque converter, transmission overhaul, service transmission, transmission assembly, computer unit, valve body, manual content, signal sequence, gear set, throttle position
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