A/T Fluid Check
FLUID LEAKAGE CHECK
1. Clean area suspected of leaking. Ð for example, mating
surface of converter housing and transmission case.
2. Start engine, apply foot brake, place selector lever in ªDº
position and wait a few minutes.
3. Stop engine.
4. Check for fresh leakage.
FLUID CONDITION CHECK
Fluid color Suspected problem
Dark or black with burned odor Wear of frictional material
Milky pinkWater contamination Ð Road water
entering through filler tube or breather
Varnished fluid, light to dark brown
and tackyOxidation Ð Over or under filling, Ð
Overheating
FLUID LEVEL CHECK
Refer to MA section (ªChecking A/T Fluidº, ªCHASSIS AND
BODY MAINTENANCEº).
Stall Test
STALL TEST PROCEDURE
1. Check A/T and engine fluid levels. If necessary, add.
2. Drive vehicle for approx. 10 minutes or until engine oil and
ATF reach operating temperature.
ATF operating temperature:
50 - 80ÉC (122 - 176ÉF)
3. Set parking brake and block wheels.
4. Install a tachometer where it can be seen by driver during
test.
+It is good practice to put a mark on point of specified
engine rpm on indicator.
5. Start engine, apply foot brake, and place selector lever in ªDº
position.
6. Accelerate to wide open throttle gradually while applying foot
brake.
7. Quickly note the engine stall revolution and immediately
release throttle.
+During test, never hold throttle wide open for more than
5 seconds.
Stall revolution:
2,480 - 2,680 rpm
SAT801A
SAT638A
SAT647B
SAT513G
SAT514G
TROUBLE DIAGNOSIS Ð Basic Inspection
AT-1041
8. Move selector lever to ªNº position.
9. Cool off ATF.
+Run engine at idle for at least one minute.
10. Repeat steps 5 through 9 with selector lever in ª2º, ª1º and
ªRº positions.
JUDGEMENT OF STALL TEST
The test result and possible damaged components relating to each result are shown in the illustration.
In order to pinpoint the possible damaged components, follow the WORK FLOW shown in AT-1040.
Note
Stall revolution is too high in ªDº or ª2º position:
+Slippage occurs in 1st gear but not in 2nd and 3rd gears. ..... Low one-way clutch slippage
+Slippage occurs at the following gears:
1st through 3rd gears in ªDº position and engine brake functions.
1st and 2nd gears in ª2º position and engine brake functions with accelerator pedal released (fully closed
throttle). ..... Forward clutch or forward one-way clutch slippage
Stall revolution is too high in ªRº position:
+Engine brake does not function in ª1º position. ..... Low & reverse brake slippage
+Engine brake functions in ª1º position. ..... Reverse clutch slippage
Stall revolution within specifications:
+Vehicle does not achieve speed of more than 80 km/h (50 MPH). ..... One-way clutch seizure in torque
converter housing
CAUTION:
Be careful since automatic fluid temperature increases abnormally.
+Slippage occurs in 3rd and 4th gears in ªDº position. ..... High clutch slippage
+Slippage occurs in 2nd and 4th gear in ªDº position. ..... Brake band slippage
Stall revolution less than specifications:
+Poor acceleration during starts. ..... One-way clutch seizure in torque converter
SAT771B
TROUBLE DIAGNOSIS Ð Basic Inspection
Stall Test (Cont'd)
AT-1042
