Circuit/System Description
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The shift solenoid 1 is part of the control solenoid valve assembly and is not serviced separately. The control solenoid valve assembly supplies 12 volts to shift solenoid 1 on the high side driver 1 circuit. The control solenoid valve assembly controls the normally closed shift solenoid 1 on the shift solenoid 1 control circuit. The shift solenoid 1 controls the transmission fluid to the hybrid low, 1-2 clutch boost valve assembly.
In the OFF position, shift solenoid 1 controls the transmission fluid to the following components:
- EVT 1 mode, oil is supplied to drive motors with generator 1 and 2 for cooling and the hybrid low, 1-2 clutch
- EVT 2 mode, oil is supplied to drive motors with generator 1 and 2 for cooling and the hybrid direct 2-3-4 clutch
In the ON position, shift solenoid 1 controls the transmission fluid to the following components:
- Gear 1, oil is supplied to the hybrid low, 1-2 clutch and the 1-3 clutch
- Gear 2, oil is supplied to the hybrid low, 1-2 clutch and the hybrid direct 2-3-4 clutch
- Gear 3, oil is supplied to the hybrid direct 2-3-4 clutch and the 1-3 clutch
- Gear 4, oil is supplied to the hybrid direct 2-3-4 clutch and the 4th clutch