MECHANICAL SYSTEM TEST

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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.

3. Inspect the engine oil.

4. Inspect the ATF. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION.)

5. Inspect the idle speed.

6. Inspect the ignition timing.

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. Perform the line pressure test at the engine idle speed for D range.

(1) Remove the square-head plug from line pressure inspection port.

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(2) Connect the SSTs as following:

• When using the oil pressure gauge set (49 0378 400C), connect the SSTs (49 H019 002, 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 913, 49 D019 909, 49 D019 908) to the line pressure inspection port as shown in the figure.

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(3) Start the engine.

(4) Warm up the automatic transaxle.

(5) Shift the selector lever to D range.

(6) Read the line pressure at the engine idle speed for D range.

3. Perform the line pressure test at the engine idle speed for each position/range in the same manner.

4. Stop the engine.

5. Perform the line pressure test at engine stall speed for D range.

(1) 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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(2) Start the engine.

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

(4) Shift the selector lever to D range.

Caution

• If the accelerator pedal is pressed for longer than 5 s while the brake pedal is pressed, the transaxle could be damaged. Therefore, perform Steps (5)—(6) within 5 seconds.

(5) Gradually depress the accelerator pedal with the right foot.

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

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

6. Perform the line pressure test at the engine stall speed for each position/range in the same manner.

Line pressure

Position/Range		Specification (kPa {kgf/cm², psi})
D, S, L (Includes each HOLD mode)	Idle	330—470 {3.4—4.7, 48—68}
D, S, L (Includes each HOLD mode)	Stall	980—1,150 {10.0—11.7, 143—166}
R	Idle	490—710 {5.0—7.2, 71—102}
R	Stall	1,610—1,910 {16.5—19.4, 234—277}

Evaluation of line pressure test

Line pressure	Possible cause
Low pressure in all ranges	Worn oil pump Oil leaking from oil pump, control valve body, and/or transaxle case Pressure regulator valve sticking Pressure control solenoid malfunction Pressure modulator valve sticking Solenoid reducing valve sticking
Low pressure in D and S only	Oil leaking from hydraulic circuit of forward clutch
Low pressure in L and R only	Oil leaking from hydraulic circuit of low and reverse brake
Low pressure in R only	Oil leaking from hydraulic circuit of reverse clutch
High pressure in all ranges	Pressure control solenoid malfunction Pressure regulator valve sticking Pressure modulator valve sticking Pressure reducing valve sticking

7. Stop the engine.

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.

8. Remove the SSTs.

9. Install a new square head plug in the inspection port.

Tightening torque

4.8—9.8 N·m {49—99 kgf·cm, 43—86 in·lbf}

Stall Test

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

2. Start the engine.

3. Perform the stall test for D range.

(1) Firmly depress the brake pedal with the left foot.

(2) Shift the selector lever to D range.

Caution

• If the accelerator pedal is pressed for longer than 5 seconds while the brake pedal is pressed, the transaxle could be damaged. Therefore, perform Steps (3)—(4) within 5 seconds.

(3) Gently depress the accelerator pedal with the right foot.

(4) When the engine speed no longer increases, quickly read the speed and release the accelerator pedal.

(5) Shift the selector lever to N position and let the engine idle for 1 min or more to cool the ATF.

4. Perform the stall test for each position/range in the same manner.

Engine stall speed

Position/Range	Specification (rpm)
D, S, L (Includes each HOLD mode)	2,200—2,800
R	2,200—2,800

Evaluation of stall test

Condition	Possible cause
Above specification	Insufficient line pressure, torque converter pressure	• Worn oil pump
		• Oil leaking from oil pump, control valve, and/or transaxle case
		• Pressure regulator valve sticking
		• Converter relief valve sticking
		• Pressure control solenoid malfunction
	In D range	• Forward clutch slipping
	In S (HOLD) range	• 2-4 brake band slipping
	In L (HOLD) range and R position	• Low and reverse brake slipping
	In R position	• Low and reverse brake slipping • Reverse clutch slipping • Perform road test to determine whether problem is in low and reverse brake or reverse clutch ― Engine braking felt in L (HOLD) range: Reverse clutch is defective. ― Engine braking not felt in L (HOLD) range: Low and reverse brake is defective.
Below specification		• Engine lack of power

Time Lag Test

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

2. Start the engine.

3. Perform the time lag test when shifting the selector lever from N position to D range.

(1) Use a stopwatch to measure the time it takes from shifting until shock is felt when shifting the selector lever from N position to D range (non-HOLD mode).

(2) Take three measurements for each test and take the average from the results using the following formula.

Formula:

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

4. Perform the time lag test when shifting the selector lever from N position to R position in the same manner.

Time lag

N position → D range: 0.4—0.7 s

N position → R position: 0.4—0.7 s

Evaluation of time lag test

Condition		Possible Cause
N → D shift	More than specification	Insufficient line pressure Forward clutch slipping Oil leaking from forward clutch fluid circuit Shift solenoid A not operating properly
N → D shift	Less than specification	Forward accumulator not operating properly Shift solenoid A not operating properly Excessive line pressure
N → D (HOLD) shift*	More than specification	Insufficient line pressure Forward clutch slipping Shift solenoid A not operating properly
N → D (HOLD) shift*	Less than specification	Forward accumulator not operating properly Shift solenoid A not operating properly Excessive line pressure
N → R shift	More than specification	Insufficient line pressure Low and reverse brake slipping Reverse clutch slipping Shift solenoid B not operating properly
N → R shift	Less than specification	Servo apply accumulator not operating properly Shift solenoid B not operating properly Excessive line pressure