Time Lag Test
Important:
• | In this test, be sure to wait for at least one minute after moving the select lever back to "N" range before starting the next measurement. |
• | Be sure to take the measurement when the engine is fully warmed up. |
- After checking the automatic transmission/transaxle (AT) level, block the front and rear wheels securely and depress the floor brake.
- Start the engine and move the select lever from "N" to "D". Using a stop watch, measure the time it takes from this point until shift shock is felt.
- Similarly, measure the time lag from "N" to "R" range.
Time Lag
| Result
| Probable Cause
|
N - D Range = 0.8 Seconds
| Time lag in shifting from "N" to "D" exceeds the specified level.
|
• | Damage of the Clutch Piston Oil Seal |
|
N - R Range = 0.8 Seconds
| Time lag in shifting from "N" to "R" exceeds the specified level.
|
• | Low and Reverse Brake Slip |
• | Damage of the Brake or Clutch Piston Oil Seal |
|
Oil Pressure Test
- Check the AT fluid level and condition. Refer to
Transmission Fluid Check.
- Attach the oil pressure gage to the oil pressure inspection hole in the transmission case.
Warning: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result if the vehicle moves unexpectedly.
- Block the front and rear wheels and apply the parking brake fully.
Important:
• | Ensure that the AT fluid does not leak after installing the oil pressure gage. |
• | Do not hold the stall condition for longer than 5 seconds at a time. Be sure to cool the transmission, idling for at least 30 seconds before starting the next test. |
- Start the engine and depress the foot brake. Measure the oil pressure in "D" and "R" ranges when idling, and when the engine has stalled.
- Compare the line pressure test results with the line pressure results in the following table. If the line pressure is not a specified, refer to the line pressure test diagnosis in this procedure for further evaluation.
Line Pressure Test Results
Engine Operation
| "D" Range
| "R" Range
|
Idling
| 470 kPa (68 psi)
| 600 kPa (87 psi)
|
Stall
| 1030 kPa (149 psi)
| 1310 kPa (190 psi)
|
Line Pressure Test Diagnosis
Result
| Probable Cause
|
"D" Range
| "R" Range
|
• | Higher than the specified oil pressure when idling |
• | Higher than the specified oil pressure when the engine has stalled |
| Faulty valve body
|
• | Lower than the specified oil pressure when idling |
• | Lower than the specified oil pressure when the engine has stalled |
|
• | Damaged low clutch piston oil seal |
|
• | Damaged reverse clutch piston oil seal |
• | Damaged low and reverse brake piston oil seal |
|