DTC P1891: Problem in Start Clutch Control System: General Description

The start clutch control system controls the clutch piston hydraulic pressure that affects the amount of power transmitted by the multiplate wet start clutch on the driven pulley shaft. The powertrain control module (PCM) activates the CVT start clutch pressure control solenoid valve to control the hydraulic pressure that is applied to the start clutch piston in accordance with vehicle conditions. The start clutch control system detects clutch overslip. If the difference between the vehicle speed measured by the CVT output shaft (driven pulley) speed sensor and the one measured by the vehicle speed sensor is excessive when driving the vehicle under the Enable Conditions, the PCM detects a malfunction and stores a DTC.