MECHANICAL SYSTEM TEST [FS5A-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 levels. (See COOLING SYSTEM SERVICE WARNINGS [L8, LF, L5].)

3.  Inspect the engine oil levels. (See ENGINE COOLANT LEVEL INSPECTION [L8, LF, L5].)

4.  Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FS5A-EL].)

5.  Inspect the idle speed. (See ENGINE TUNE-UP [L8, LF, L5].)

6.  Inspect the ignition timing. (See ENGINE TUNE-UP [L8, LF, L5].)


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.

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.
(2)  Connect the SSTs (49 H019 002 and, 49 0378 400C) to the line pressure inspection port.
(3)  Replace the gauge of the SST (49 0378 400C) with the SST (49 B019 901B).
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(4)  Start the engine.
(5)  Warm up the automatic transaxle.
(6)  Shift the selector lever to D range.
(7)  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.

Note
•  Replace the SST according to the line pressure.
―  49 B019 901B: for 0—1,000 kPa
―  49 B019 902A: for 0—2,500 kPa

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

(1)  Replace the SST (49 B019 901B) with the gauge of the SST (49 0378 400C).
(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 seconds 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 minute 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})

LF

L5

D, M (1GR, 2GR)
Idle
330—470 {3.4—4.7, 48—68}
Stall
1,200—1,320 {12.24—13.46, 174.1—191.4}
R
Idle
490—710 {5.0—7.2, 71—102}
Stall
1,630—1,930 {16.63—19.68, 236.4—279.9}
1,850—2,120 {18.87—21.61, 268.4—307.4}

Evaluation of line pressure test

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 stuck
Pressure control solenoid A malfunction
Solenoid reducing valve stuck
Low pressure in D, M (1GR, 2GR) ranges
Oil leaking from forward clutch hydraulic circuit
Low pressure in M (2GR) range
Oil leaking from 2-4 brake band hydraulic circuit
Low pressure in M (1GR) range, R position
Oil leaking from low and reverse brake hydraulic circuit
Low pressure in R position
Oil leaking from reverse clutch hydraulic circuit
Higher pressure in all position/ranges
Pressure control solenoid A malfunction and/or open harness
Pressure regulator valve stuck
TCM malfunction

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)

LF

L5

D,M (1GR, 2GR)
2,200—2,800
2,400—3,000
R

Evaluation of stall test

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 A malfunction
In D, M (1GR, 2GR) ranges
•  Forward clutch slipping
In D range
•  One-way clutch No.1 malfunction
In D, M (2GR) ranges
•  2-4 brake band slipping
•  One-way clutch No.1 malfunction
In D, M (1GR) ranges
•  Low and reverse brake slipping
•  One-way clutch No.1 malfunction
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 M (1GR) range: Reverse clutch is defective.
―  Engine braking not felt in M (1GR) 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.
(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
Low 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
N → R shift
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