MECHANICAL SYSTEM TEST [SJ6A-EL]

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Mechanical System Test Preparation

1. Engage the parking brake and use wheel chocks at the front and rear of the wheels.

2. Inspect the engine coolant level. (See ENGINE COOLANT LEVEL INSPECTION [L8, LF].)

3. Inspect the engine oil level. (See ENGINE OIL LEVEL INSPECTION [L8, LF].)

4. Inspect the ATF level. (See AUTOMATIC TRANSMISSION FLUID (ATF) LEVEL ADJUSTMENT [SJ6A-EL].)

5. Inspect the idle speed. (See ENGINE TUNE-UP [L8, LF].)

6. Inspect the ignition timing. (See ENGINE TUNE-UP [L8, LF].)

7. Verify that no DTCs are stored.

Line Pressure Test

1. Perform mechanical system test preparation. (See Mechanical System Test Preparation.)

  Warning
  • Removing the square head plug when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the square head plug, allow the ATF to cool.

  Note
  • Use a suitable oil pressure gauge that corresponds to the line pressure because the maximum scale value differs depending on the oil pressure gauge.

2. Remove the test plug and O-ring from the line pressure inspection port.

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3. Connect the SSTs as following:

  • When using the oil pressure gauge set (49 0378 400C), connect the SSTs (49 HD64 406A, 49 0378 400C, 49 B019 901B) to the line pressure inspection port as shown in the figure.
  • When using the oil pressure gauge set (49 D019 9A2), connect the SSTs (49 D019 910, 49 D019 911, 49 D019 912, 49 D019 909, 49 D019 908) to the line pressure inspection port as shown in the figure.

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4. Start the engine and warm it up until the ATF reaches 60—70 °C {140—158 °F}.

5. Shift the selector lever to the D range.

6. Read the line pressure while the engine is idling for the D range.

7. Read the line pressure while the engine is idling for the M range and R position in the same manner.

8. Stop the engine.

9. Replace the oil pressure gauge as following:

  • When using the oil pressure gauge set (49 0378 400C), replace the SST (49 B019 901B) with SST (49 B019 902A).
  • When using the oil pressure gauge set (49 D019 9A2), replace the SST (49 D019 908) with SST (49 D019 907).

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10. Start the engine.

11. Firmly depress the brake pedal with the left foot.

12. Shift the selector lever to the D range.

  Caution
  • If the accelerator pedal is pressed for more than 5 s while the brake pedal is pressed, the transmission could be damaged. Therefore, perform Steps 13 and 14 within 5 s.

13. Gradually depress the accelerator pedal with the right foot.

14. When the engine speed no longer increases, quickly read the line pressure and release the accelerator pedal.

15. Shift the selector lever to the N position and idle the engine for 1 min or more to cool the ATF.

16. Read the line pressure at the engine stall speed for the M range and R position in the same manner as in Steps 11—15.

Line pressure

Position/Range | Specification (kPa {kgf/cm2, psi})
--- | ---
D, M | Idle | 355—425 {3.7—4.3, 52—61}
Stall | 863—959 {8.8—9.7, 126—139}
R | Idle | 804—942 {8.2—9.6, 117—136}
Stall | 1,424—1,608 {14.6—16.3, 207—233}

  Warning
  • Removing the square head plug when the ATF is hot can be dangerous. Hot ATF can come out of the opening and badly burn you. Before removing the square head plug, allow the ATF to cool.

17. Remove the SSTs.

18. Install the test plug and O-ring in the inspection port.

  Tightening torque

  5.9—8.8 N·m {61—89 kgf·cm, 53—77 in·lbf}

Evaluation of line pressure test

Condition | Possible cause
--- | ---
High pressure in all ranges | • Line pressure control solenoid malfunction • Primary regulator valve malfunction
Low pressure in all ranges | • Line pressure control solenoid malfunction • Primary regulator valve malfunction • Oil pump malfunction
Low pressure in D range only | • Hydraulic circuit of D malfunction • C1 clutch malfunction
Low pressure in R position only | • Hydraulic circuit of R malfunction • C3 clutch malfunction • B4 brake malfunction

Stall Speed Test

1. Perform mechanical system test preparation. (See Mechanical System Test Preparation.)

2. Start the engine.

3. Firmly depress the brake pedal with the left foot.

4. Shift the selector lever to the D range.

  Caution
  • If the accelerator pedal is pressed for more than 5 s while the brake pedal is pressed, the transmission could be damaged. Therefore, perform Steps 5 and 6 within 5 s.

5. Gently depress the accelerator pedal with the right foot.

6. When the engine speed no longer increases, quickly read the engine speed and release the accelerator pedal.

7. Shift the selector lever to the N position and idle the engine for 1 min or more to cool the ATF.

8. Perform a stall test of the D and R position in the same manner as in Steps 3—7.

9. Turn off the engine.

Engine stall speed

Position/Range | Specification (rpm)
--- | ---
D, R, M | 2,307—2,607

Evaluation of stall test

Condition | Possible cause
--- | ---
Low pressure in all ranges | • Engine lack of power • Torque converter one-way clutch malfunction
High pressure in D range only | • Insufficient line pressure • C1 clutch malfunction (slippage) • F3 one-way clutch malfunction
High pressure in R range only | • Insufficient line pressure • B4 brake malfunction (slippage) • C3 clutch malfunction (slippage) • F1 one-way clutch malfunction
High pressure in all ranges | • Insufficient line pressure • Oil leakage from each range circuit

Time Lag Test

1. Perform mechanical system test preparation. (See Mechanical System Test Preparation.)

2. Start the engine.

3. Warm up the engine until the ATF temperature reaches 60—70°C {140—158°F}.

4. Shift the selector lever from the N position to D range.

5. Use a stopwatch to measure the time it takes from shifting until shock is felt. Take three measurements for each test and average from the results using the following formula.

  Formula

  Average time lag = (Time 1 + Time 2 + Time 3) / 3

6. Perform the test for the following shifts in the same manner Step 5.

  • N position → R position

  Time lag

  N position → D range: 0.7 s or less
  N position → R position: 1.2 s or less

Evaluation of time lag test

Condition | Possible Cause
--- | ---
N → D shift | • Insufficient line pressure • C1 clutch malfunction (slippage) • F3 one-way clutch malfunction
N → R shift | • Insufficient line pressure • C1 clutch malfunction (slippage) • C3 clutch malfunction (slippage) • F1 one-way clutch malfunction