Clutch Volumes

CLUTCH VOLUMES
Theory of Operation: The volumes of the transmission fluid needed to apply the friction elements are continuously monitored and learned for adaptive controls. As the clutch friction material wears, the volume of fluid needed to apply the clutch increases. The following are typical clutch volumes, the clutches may be damaged if the volumes are greater or less than the specified below:

The LR clutch volume is updated when doing a 2-1 or 3-1 coast down shift. The transmission temperature must be between 21-49 C (70-120° F). The clutch volume should be between 35 and 83.

The 2/4 clutch volume is updated when doing a 1-2 shift. The transmission temperature must be above 43 C (110° F). The clutch volume should be between 20 and 77.

The OD clutch volume is updated when doing a 2-3 shift. The transmission temperature must be above 43 C (110° F). The clutch volume should be between 40 and 150.

The UD clutch volume is updated when doing a 4-3 or 4-2 shift. The transmission temperature must be above 43 C (110° F). The clutch volume should be between 24 and 70.

Transmission Effects: These CVIs that are out of range are usually set with other DTC's, which indicates an internal transmission problem.

Possible Causes:
- Clutch pack clearance out of spec
- Snap ring out of position or broken
- Broken return spring
- Hydraulic leak into clutch circuit with near-zero volume