Circuit Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The automatic transmission (AT) clutch pressure control (PC) solenoid valve 2 is mounted to the transmission case. Upon receiving a linear current from the PCM, the AT clutch PC solenoid valve 2 converts the modulated pressure to a regulated control pressure, and supplies it for use in the pressure regulation using the spring P at the clutch pressure control valve. The linear current from the PCM is output to the clutch of an appropriate gear position, as determined by the shift schedule, so that a clutch control pressure appropriate for the driving condition is supplied. When the linear current from the PCM is on the high current side, linear solenoid 2 operates and the pressure regulation control pressure shifts to the low pressure side, OFF. When the linear current is on the low voltage side, linear solenoid 2 stops operating and the pressure regulation control pressure shifts to the high pressure side, ON. The PCM monitors mainshaft to output shaft speed ratio in the gear positions determined by the shift schedule.

When the incorrect ratio for the commanded gear is detected, the PCM determines it as a fault of the linear solenoid and DTC P0777 sets. DTC P0777 is a type B DTC.