Circuit/System Description
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. 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 V 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