MECHANICAL SYSTEM TEST [FN4A-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. (See ENGINE COOLANT LEVEL INSPECTION [ZJ, ZY].)

3.  Inspect the engine oil. (See ENGINE OIL LEVEL INSPECTION [ZJ, ZY].)

4.  Inspect the ATF. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FN4A-EL].)

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

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

7.  Verify that no DTCs recorded. (See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY].)

Line Pressure Test

1.  Perform the “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 with the engine idle at 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 transaxle until the ATF temperature reaches at 60—70 °C {140—158 °F}.

(5)  Select 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)  Select 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 the Steps (5)—(6) within 5 s.

(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)  Select 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.

•  If there is any malfunction, inspect the following “Possible Cause” according to the condition.

Condition		Possible cause
Low pressure	In all position/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
	In D, S, L ranges	Oil leaking from hydraulic circuit of forward clutch
	In D (HOLD), S (HOLD) ranges	Oil leaking from hydraulic circuit of 2-4 brake band
	In L (HOLD) range, R position	Oil leaking from hydraulic circuit of low and reverse brake
	In R position	Oil leaking from hydraulic circuit of reverse clutch
High pressure	In all position/ranges	Pressure control solenoid malfunction Pressure regulator valve sticking Pressure modulator valve sticking Pressure reducing valve sticking

7.  Stop the engine.

Warning

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

8.  Remove the SSTs.

Note

•  Do not reuse the square-head plug because it is coated.

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

Stall Test

1.  Perform the “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)  Select 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 the Steps (3)—(4) within 5 s.

(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)  Select 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.

•  If there is any malfunction, inspect the following “Possible Cause” according to the condition.

Condition		Possible cause
Above specification	In all position/ranges	Insufficient line 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, S, L ranges	•  Forward clutch slipping
	In D range	•  One-way clutch malfunction
	In D, D (HOLD), S (HOLD) ranges	•  2-4 brake band slipping •  One-way clutch malfunction
	In D, L (HOLD) ranges	•  Low and reverse brake slipping •  One-way clutch malfunction
	In R position	•  Low and reverse brake slipping •  Reverse clutch slipping •  Perform the “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 the “Mechanical System Test Preparation”. (See Mechanical System Test Preparation.)

2.  Start the engine.

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

(1)  Use a stopwatch to measure the time it takes from selecting until shock is felt when selecting 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 selecting the selector lever from N position to R position in the same manner.

•  If there is any malfunction, inspect the following “Possible Cause” according to the condition.

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