D Position, when an electronic control system malfunction occurs

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.

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 start clutch control 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 drive pulley control pressure (DRC). Clutch reducing pressure (CR) becomes shift inhibitor pressure (SI) at the shift inhibitor valve. Pressure then flows to the left side of the start clutch back-up valve, and becomes start clutch control B pressure (CCB). Start clutch control B pressure (CCB) becomes start clutch pressure (SC) at the shift inhibitor valve, and flows to the start clutch. Clutch reducing pressure (CR) also flows to the manual valve and becomes forward clutch pressure (FWD). The start clutch and the forward clutch are engaged, and the vehicle can move.

NOTE: When used, "left" or "right" indicates direction on the hydraulic circuit.

Fig 1: CVT System Hydraulic Flow Diagram - D Position When Electronic Control System Malfunction Occurs

Courtesy of AMERICAN HONDA MOTOR CO., INC.