MECHANICAL SYSTEM TEST [AW6AX-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 COOLING SYSTEM SERVICE WARNINGS [MZI-3.7].) (See ENGINE COOLANT LEVEL INSPECTION [MZI-3.7].)

3.  Inspect the engine oil level. (See ENGINE OIL LEVEL INSPECTION [MZI-3.7].)

4.  Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [AW6AX-EL].)

5.  Inspect the idle speed. (See ENGINE TUNE-UP [MZI-3.7].)

6.  Inspect the ignition timing. (See ENGINE TUNE-UP [MZI-3.7].)

Line Pressure Test

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

Warning

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

2.  Set the oil cooler in a location out of the way, then connect the SSTs (49 HD64 406A and, 49 0378 400C) to the line pressure inspection port and replace the gauge of the SST (49 0378 400C) with the SST (49 B019 901B).

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

4.  Shift the selector lever to the D range.

Caution

•  Perform the test at least 3 times and calculate the average.

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

6.  Read the line pressure while the engine is idling for the R position and M range in the same manner as in Steps 4—5.

7.  Stop the engine, then replace the SST (49 B019 901B) with the gauge of the SST (49 0378 400C).

8.  Connect the M-MDS to the DLC-2.

L.H.D.

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R.H.D.

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9.  Measure the LPS PID value.

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 transaxle could be damaged. Therefore, perform Steps 14 and 15 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.  Verify that the line pressure and LPS PID current values change according to the following graph by changing the shift throttle opening angle when shifting to the D range and R position with the engine running.

―  The line pressure standard other than when the engine is idling cannot be determined because the maximum line pressure for this automatic transaxle is controlled by vehicle conditions.

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Warning

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

17.  Remove the SSTs.

18.  Install a test plug in the inspection port.

Line pressure test evaluation

Stall 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 depressed for more than 5 s while the brake pedal is depressed, the transaxle could be damaged. Therefore, perform Steps 5 and 6 within 5 s.

•  Perform the test at least 3 times and calculate the average.

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 M range and R position in the same manner as in Steps 3—7.

9.  Turn off the engine.

Evaluation of stall test

Time Lag Test

1.  Perform mechanical system test preparation. (SeeMechanical 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.

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

•  N position → R position

Evaluation of time lag test