D Position, when an electronic control system malfunction occurs
When an electronic control system malfunction occurs in D, and the CVT clutch pressure control solenoid valve cannot control the start clutch pressure circuit, the transmission creates a temporary circuit for the start clutch pressure control to allow the vehicle to be driven.
The CVT clutch pressure control solenoid valve covers the start clutch control pressure (CC) port leading to the shift inhibitor valve, and the shift inhibitor valve is moved to the left side by the drive pulley control pressure (DRC). The clutch reducing pressure (CR) becomes the shift inhibitor pressure (SI) at the shift inhibitor valve. The shift inhibitor pressure (SI) then flows to the left side of the start clutch back-up valve, and becomes the start clutch control B pressure (CCB). The start clutch control B pressure (CCB) becomes the start clutch pressure (SC) at the shift inhibitor valve, and flows to the start clutch. The clutch reducing pressure (CR) also flows to the manual valve and becomes the forward clutch pressure (FWD). The start clutch and the forward clutch are engaged, and the vehicle can move.