Circuit/System Description

WARNING: This page is about a different car, the 2017 GMC Yukon XL, 2017 GMC Yukon, 2017 Chevrolet Tahoe, 2017 Chevrolet Suburban 3500 HD, and 2017 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

The Transmission Fluid Pressure Switch 4 is part of the control solenoid valve assembly which has no serviceable parts. The Transmission Control Module supplies a signal circuit to the Transmission Fluid Pressure Switch 4. The Transmission Fluid Pressure Switch 4 has an internal case ground. Transmission Fluid Pressure Switch 4 is normally closed or LOW. When oil pressure is present at the Transmission Fluid Pressure Switch 4, the switch is open or HIGH. The normally LOW pressure control solenoid 5 controls pressure to the 1-2-3-4 clutch regulator valve. The Transmission Control Module monitors the Transmission Fluid Pressure Switch 4 to determine the position of the 1-2-3-4 clutch regulator valve. When the 1-2-3-4 clutch is commanded OFF, pressure is present on the Transmission Fluid Pressure Switch 4. When the 1-2-3-4 clutch is commanded ON, the 1-2-3-4 clutch regulator valve moves and pressure to the Transmission Fluid Pressure Switch is exhausted through the 1-2-3-4 clutch regulator valve.