Inspections Before Trouble Diagnosis

TROUBLE DIAGNOSIS


Inspections Before Trouble Diagnosis


A/T FLUID CHECK

Fluid Leakage and Fluid Level Check
Check fluid leakage and check the fluid level.

Fluid Condition Check
Check the A/T fluid condition.











STALL TEST

Stall Test Procedure
1. Check ATF and engine oil levels. If necessary, add ATF and engine oil.





2. Drive vehicle for approximately 10 minutes or until ATF and engine oil reach operating temperature.

ATF operating temperature: 50 - 80�C (122 - 176�F)






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 mark the point of specified engine rpm on indicator.





5. Start engine, apply foot brake, and place selector lever in "D" position.
6. Accelerate to wide open throttle gradually while applying foot brake.





7. Quickly note the engine stall revolution and immediately release throttle.

CAUTION:
Do not hold down the accelerator pedal for more than 5 seconds during this test.

Stall revolution: Stall Speed






8. Move selector lever to "N" position.
9. Cool off ATF.

CAUTION:
Run the engine at idle for at least 1 minute.
10. Repeat steps 6 through 9 with selector lever in "2", "1" and "R" positions.

Judgement of Stall Test
The test result and possible damaged components relating to each result are shown in the illustrations.
In order to pinpoint the possible damaged components,

NOTE:
Stall revolution is too high in "D", "2", or "1" position:
- Slippage occurs in 1st gear but not in 2nd and 3rd gears. ..... Low one-way clutch slippage
- Slippage occurs in the following gears:
1st through 3rd gears in "D" position and engine brake functions with OD OFF. (OD OFF indicator lamp is on.)
1st and 2nd gears in "2" 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 "R" position:
- Engine brake does not function in "1" position. ..... Low and reverse brake slippage
- Engine brake functions in "1" 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 because automatic fluid temperature increases abnormally:
- Slippage occurs in 3rd and 4th gears in "D" position. ..... High clutch slippage
- Slippage occurs in 2nd and 4th gears in "D" position. ..... Brake band slippage
- Engine brake does not function in 2nd and 3rd gears in "D" position, 2nd gear in "2" position, and 1st gear in "1" position with OD OFF. (OD OFF indicator lamp is on.) ..... Overrun clutch slippage
Stall revolution less than specifications:
- Poor acceleration during starts. ..... One-way clutch seizure in torque converter






LINE PRESSURE TEST

Line Pressure Test Ports
Location of line pressure test ports are shown in the figure.





- Always replace pressure plugs as they are self-sealing bolts.

Line Pressure Test Procedure
1. Check ATF and engine oil levels. If necessary, add ATF or engine oil.





2. Drive vehicle for approx. 10 minutes or until engine oil and ATF reach operating temperature.

ATF operating temperature: 50 - 80�C (122 -176�F)






3. Install oil pressure gauge to corresponding line pressure test port.
4. Set parking brake and block wheels.





5. Start engine and measure line pressure at idle and stall speed.

CAUTION:
- Keep the brake pedal pressed all the way down during measurement.





- When measuring the line pressure at the stall speed, refer to "STALL TEST".

Line Pressure






Judgement of Line Pressure Test