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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1536 (Automatic Transmission - 5AT - Introduction (2 Of 2)) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Drive Range - Fourth Gear >> D Position: Driving in 4th gear

D Position: Driving in 4th gear

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 PCM turns shift solenoid (SS) valve C OFF, and controls AT CPC solenoid valve B to release LS B pressure (57) in CPC valve B. SS valve A and B stay OFF. The release of LS B pressure (57) in CPC valve B releases CPC B pressure in the 3rd clutch pressure circuit. SS valve C is turned OFF, and SH C pressure (SC) is applied to the right side of shift valve C. Shift valve C is then moved to the left side to switch the port of line pressure and CPC pressure. Line pressure (4), from the manual valve, becomes 4th clutch pressure (40) at shift valve D, via shift valve C, A, and B, and flows to the 4th clutch. The 4th clutch pressure is changed to line pressure mode by switching the position of shift valve C, and the 4th clutch is engaged securely. The 1st clutch is also engaged. No power is transmitted because of the one-way clutch.

When used, "left" or "right" indicates direction on the hydraulic circuit.

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