DTC P1730: Problem in Shift Control System: General Description

Hydraulic pressure to each clutch is controlled by a shift valve. The shift valve activates according to the ON/OFF status of shift solenoid valves A, B, C, D, and E. Hydraulic pressure supply in D is shown above. The line pressure or the A/T clutch pressure control solenoid valve A, B, or C pressure is supplied to each clutch by the shift valve activated. The powertrain control module (PCM) computes the actual ratio of input shaft (mainshaft) and output shaft (countershaft) revolutions. If a difference between the actual ratio and the commanded gear occurs when shifting to each gear position, the PCM detects a malfunction in the shift solenoid valve or in the hydraulic system and stores a DTC.