Fluid - A/T: Testing and Inspection
INSPECT FLUID LEVEL1. Drive until the fluid temperature reaches the operating temperature 70 - 80 °C (158 - 176 °F)
2. Place vehicle on level floor.
3. Move selector lever sequentially to every position to fill torque converter and hydraulic circuit with fluid, then place lever in "N" Neutral position. This operation is necessary to be sure that fluid level check is accurate.
4. Before removing dipstick, wipe all dirt from area around dipstick. Then take out the dipstick and check the condition of the fluid.
Further investigation of the transaxle is necessary if,
- the fluid smells burnt.
- the fluid color is brown or black.
- metal particles can be seen or felt on the dipstick.
5. Check to see if fluid level is in "HOT" range on dipstick. If fluid level is low, add ATF until level reaches "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 circuit forms bubbles which make the fluid spongy.
Therefore, pressures will be erratic.
Improper filling can also raise fluid level too high. When the transaxle has too much fluid, gears churn up foam and cause the same conditions which occur with low fluid level, resulting in accelerated deterioration of ATF
In either case, air bubbles can cause overheating, fluid oxidation, 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.
6. Be sure to examine the fluid on the dipstick closely.