Circuit/System Description
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
The shift solenoid (SS) 1 is part of the control solenoid (w/body and transmission control module (TCM) valve assembly and is not serviced separately. The control solenoid (w/body and TCM) valve assembly supplies 12 volts to SS 1 on the high side driver 1 circuit. The control solenoid (w/body and TCM) valve assembly controls the normally closed SS 1 on the SS 1 control circuit. The SS 1 controls the transmission fluid to the 1-3 clutch regulator valve assembly.
In the OFF position, SS 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.
- 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.
In the ON position, SS 1 controls the transmission fluid to the following components:
- EVT 2 mode, oil is supplied to drive motors with generator 1 and 2 for cooling 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.