Initial Inspection and Diagnostic Overview

AUTOMATIC TRANSMISSION FLUID (ATF) LEVEL AND CONDITION
1. Place the vehicle on a level floor.
2. Before removing the dipstick, wipe all dirt from the area around the dipstick.
3. With the selector lever in "P" (Park), and the parking brakes applied, start the engine.
4. The engine should be running at idle speed. Fluid should be at normal operating temperature [70-80°C (160-180°F)].
5. Move the selector 1ever sequentially to every position to fill the torque converter and hydraulic system with fluid, then place the selector lever in "N" (Neutral) position. This operation is necessary to be sure that the fluid level check is accurate.
6. Check to see if the fluid level is in "HOT" range on dipstick. If fluid is low, add automatic transmission fluid until level reaches the "HOT" range.

Low fluid level can cause a variety of conditions because it allows the pump to take in air along with fluid. Air trapped in the hydraulic system forms bubbles, which are compressable. Therefore, the pressure will be erratic.

Improper filling can also cause the fluid level to be too high. When transaxle has too much fluid, gears churn up foam and cause the same conditions which occur with low fluid level. This results in accelerated deterioration of the automatic transaxle fluid. In either case, air bubbles can cause overheating, fluid oxidation, and varnishing, which can interfere with normal valve, clutch, and servo operation. Foaming can also result in fluid escaping from the transaxle vent, where it may be mistaken for a leak.

Along with fluid level, it is important to check the condition of the fluid. When fluid smells burned, and is contaminated with metal particles or friction material particles, a complete transaxle overhaul is needed. Be sure to examine fluid on the dipstick closely. If there is any doubt about its conditions, drain out a sample for a closer check. After fluid has been checked, seat the dipstick fully to seal out water and dirt.