R Position: Operation

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Line pressure applied to the manual valve is transmitted to line pressure, which engages the reverse clutch.
Line pressure also engages the low and reverse brake through the reverse inhibitor valve.
Line pressure driven to the pressure regulator valve is transmitted to torque converter pressure and sent to the torque converter through the TCC control valve.

Fig 1: Identifying R Position Line Pressures
Courtesy of MAZDA MOTORS CORP.