Mazda CX-9 Grand Touring. Manual — part 84

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.

Fig. 4: Line Pressure Control Solenoid Current Diagram
Courtesy of MAZDA MOTORS CORP.

17. Remove the SSTs.

18. Install a test plug in the inspection port.

Tightening torque

5.9-8.8 N.m {61-89 kgf.cm, 53-77 in.lbf}

Line pressure test evaluation

LINE PRESSURE TEST EVALUATION POSSIBLE CAUSE

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.

Condition

Possible cause

Lower than specification in D range and R position



Line pressure control solenoid
malfunction



Primary regulator valve malfunction

2008 Mazda CX-9 Grand Touring

2008 TRANSMISSION Automatic Transaxle (AW6A-EL, AW6AX-EL) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:29:30 AM

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© 2005 Mitchell Repair Information Company, LLC.

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.

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.

Engine stall speed

ENGINE STALL SPEED POSSIBLE CAUSE

Evaluation of stall test

EVALUATION OF STALL TEST POSSIBLE CAUSE



Oil pump malfunction



Oil leaking from D range or R
position hydraulic circuit

Constant pressure without fluctuation in hydraulic pressure
to throttle in D range and R position



Line pressure control solenoid
malfunction



Control valve body internal
malfunction

Current to throttle does not change in D range and R
position



TCM internal malfunction



Connector malfunction

Hydraulic pressure in R position is not higher than D range



Primary regulator valve malfunction

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.

Position/range

Engine stall speed (rpm)

D, M

2,637

R

2,555

Condition

Possible cause

2008 Mazda CX-9 Grand Touring

2008 TRANSMISSION Automatic Transaxle (AW6A-EL, AW6AX-EL) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:29:30 AM

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© 2005 Mitchell Repair Information Company, LLC.

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 as in Step 5.



N position --> R position

Average time lag

N position --> D range: 1.5 s or less

N position --> R position: 1.5 s or less

Above
specification

In D, M ranges



Low line pressure (Line pressure control solenoid
malfunction, primary regulator valve malfunction)



Control valve body component malfunction (shift solenoid C
hydraulic pressure system)



C1 clutch slipping



One-way clutch malfunction

In R position



Low line pressure (Line pressure control solenoid
malfunction, primary regulator valve malfunction)



Control valve body component malfunction (shift solenoid E
hydraulic pressure system)



C3 clutch malfunction (slipping)



B2 brake malfunction (slipping)

In all
positions/ranges



Low line pressure (Line pressure control solenoid
malfunction, primary regulator valve malfunction)



Oil pump malfunction



Oil strainer clogging

Below specification



Engine lack of power



Torque converter one-way clutch slipping

2008 Mazda CX-9 Grand Touring

2008 TRANSMISSION Automatic Transaxle (AW6A-EL, AW6AX-EL) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:29:30 AM

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© 2005 Mitchell Repair Information Company, LLC.

Evaluation of time lag test

EVALUATION OF TIME LAG TEST POSSIBLE CAUSE

ROAD TEST [AW6A-EL, AW6AX-EL]

ROAD TEST PREPARATION

1. Inspect the engine coolant level. (See COOLING SYSTEM SERVICE WARNINGS [MZI-3.7] .) (See

ENGINE COOLANT LEVEL INSPECTION [MZI-3.7] .)

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

3. Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [AW6A-EL,

AW6AX-EL].)

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

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

6. Bring up the engine and transaxle to normal operating temperature.

SHIFT DIAGRAM

D range (normal mode)

Condition

Possible cause

N --> D
shift

More than
specification



Control valve body malfunction (shift solenoid C hydraulic
pressure system)



C1 clutch slipping



One-way clutch malfunction



Oil pump malfunction



Oil strainer clogging

N --> R
shift

More than
specification



Control valve body malfunction (shift solenoid E hydraulic
pressure system)



C3 clutch slipping



B2 brake slipping



Oil pump malfunction



Oil strainer clogging

WARNING:



When performing a road test, be aware of other vehicles, people, and
other impediments in order to avoid an accident.

NOTE:



When the legal speed limit must be exceeded, use a chassis dynamometer
instead of performing a road test.

2008 Mazda CX-9 Grand Touring

2008 TRANSMISSION Automatic Transaxle (AW6A-EL, AW6AX-EL) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:29:30 AM

Page 8

© 2005 Mitchell Repair Information Company, LLC.