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Mazda CX 7. Manual - part 250

SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–19

05-03

End Of Sie

NO.13 NO KICKDOWN[AW6A-EL, AW6AX-EL]

id050310801800

End Of Sie

NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING[AW6A-EL, AW6AX-EL]

id050310801900

• Inspect the line pressure control solenoid.

(See 05-17-20 SOLENOID VALVE
INSPECTION[AW6A-EL, AW6AX-EL].)

• Is the line pressure control solenoid normal?

Yes

Go to the next step.

Replace the control valve body.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

• Remove the torque converter.

(See 05-17-46 TORQUE CONVERTER
REMOVAL/INSTALLATION[AW6A-EL,
AW6AX-EL].)

• Inspect the torque converter.

• Is the torque converter normal?

Yes

Inspect the ATF condition.

• If a large amount of metal specks are found, replace the

transaxle.
(See 05-17-29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

• If a large amount of metal specks are not found, replace

the control valve body.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

Replace the torque converter.

• Verify test results.

— If normal, return to the diagnostic index to service any additional symptoms.

— If malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform

repair or diagnosis.

• If the vehicle is repaired, troubleshooting completed.

• If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.

STEP

INSPECTION

ACTION

No kickdown

DESCRIPTION

• Does not downshift when accelerator pedal is fully depressed within kickdown range.

POSSIBLE

CAUSE

• If transaxle does not downshift though shifting is normal, the malfunction is in the accelerator pedal

position sensor and accelerator pedal position sensor circuits (including sensor GND, sensor wiring
harness and connector).

Engine flares up or slips when upshifting or downshifting

DESCRIPTION

• When the accelerator pedal is depressed for acceleration from standstill, engine speed increases but

the vehicle speed increases slowly.

• When the accelerator pedal is depressed while driving, engine speed increases but the vehicle speed

does not.

POSSIBLE

CAUSE

• There is clutch slippage because the clutch is stuck or the line pressure is low.

— Clutch stuck, slippage (C1 clutch, C2 clutch, C3 clutch, B1 brake)

• Line pressure low

• Incorrect accelerator opening signal

• VSS malfunction

• Input/turbine speed sensor malfunction

• Sensor GND malfunction

• Shift solenoid C malfunction

• Shift solenoid D malfunction

• Shift solenoid E malfunction

• Line pressure control solenoid malfunction

• TCC control solenoid malfunction

• Shift solenoid F malfunction

• Body GND malfunction

• Control valve body malfunction

Note

• Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board

Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See 05-03-3 BASIC
INSPECTION[AW6A-EL, AW6AX-EL].)

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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–20

Diagnostic procedure

End Of Sie

NO.15 ENGINE FLARES UP OR SLIPS WHEN ACCELERATING VEHICLE[AW6A-EL, AW6AX-EL]

id050310802000

End Of Sie

STEP

INSPECTION

ACTION

• Is the line pressure normal?

(See 05-17-3 MECHANICAL SYSTEM
TEST[AW6A-EL, AW6AX-EL].)

Yes

Go to the next step.

Repair or replace any malfunctioning parts according to the
inspection results.

• Is shift point normal?

(See 05-17-7 ROAD TEST[AW6A-EL,
AW6AX-EL].)

Yes

Go to the next step.

Go to No.9 “ABNORMAL SHIFTING”.

• Stop the engine.

• Inspect following solenoids.

(See 05-17-20 SOLENOID VALVE
INSPECTION[AW6A-EL, AW6AX-EL].)
— Shift solenoid C

— Shift solenoid D

— Shift solenoid E

— Line pressure control solenoid

— TCC control solenoid

— Shift solenoid F

• Are they normal?

Yes

Inspect the ATF condition.

• If a large amount of metal specks are found, replace the

transaxle.
(See 05-17-29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

• If a large amount of metal specks are not found, replace

the control valve body.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

Replace the control valve body.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

• Inspect the coupler component for open or

short.

• Are coupler component normal?

Yes

Go to the next step.

Replace the coupler component.

• Inspect the ATF condition.

• Are a large amount of specks found?

Yes

Replace the transaxle.
(See 05-17-29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

Replace the control valve body.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

• Verify test results.

— If normal, return to the diagnostic index to service any additional symptoms.

— If malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform

repair or diagnosis.

• If the vehicle is repaired, troubleshooting completed.

• If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.

Engine flares up or slips when accelerating the vehicle

DESCRIPTION

• Engine flares up when the accelerator pedal is depressed for upshifting.

• Engine flares up suddenly when the accelerator pedal is depressed for downshifting.

POSSIBLE

CAUSE

• The malfunction is basically the same as for No.14 “ENGINE FLARES UP OR SLIPS WHEN

UPSHIFTING OR DOWNSHIFTING”.
— If conditions for No.14 worsen, the malfunction will develop to No.15.

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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–21

05-03

NO.16 JUDDER UPON TORQUE CONVERTER CLUTCH (TCC) OPERATION[AW6A-EL, AW6AX-EL]

id050310802100

End Of Sie

NO.17 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE[AW6A-EL, AW6AX-EL]

id050310802200

Diagnostic procedure

Judder upon torque converter clutch (TCC) operation

DESCRIPTION

• Vehicle jolts when TCC is engaged.

POSSIBLE

CAUSE

• Poor TCC engagement due to either slippage because the TCC piston is stuck or the line pressure is

low.

Caution

• If the TCC is stuck, inspect it. In addition, inspect the oil cooler for foreign particles which

may have mixed in with the ATF.

— TCC slippage, burnt

• Line pressure low

• Incorrect accelerator opening signal

• VSS malfunction

• Input/turbine speed sensor malfunction

• Sensor GND malfunction

• TCC control solenoid malfunction

• Control valve body malfunction

— Torque converter malfunction

— Centrifugal hydraulic pressure clutch is not operating properly

Excessive shift shock from N to D or N to R position/range

DESCRIPTION

• Strong shock felt when shifting from N to D or N to R position/range at idle.

POSSIBLE

CAUSE

• Shift shock may worsen when the fail-safe is operating. If no DTC is output, the shift shock may worsen

due to poor operation of the control valve body or sticking of the clutch.
— Clutch burnt (N

→D: C1 clutch, N→R: C3 clutch or B2 brake)

• Line pressure low

• Incorrect accelerator opening signal

• TFT sensor malfunction

• Sensor GND malfunction

• Shift solenoid C malfunction

• Shift solenoid E malfunction

• Line pressure control solenoid malfunction

• Control valve body malfunction

— Poor hydraulic operation (Malfunction in range change)

— Idle speed high

— Poor tightening torque of engine mount, exhaust mount

— Line pressure high

— Garage shift control is not learned

• Initial learning did not perform

Note

• Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board

Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See 05-03-3 BASIC
INSPECTION[AW6A-EL, AW6AX-EL].)

STEP

INSPECTION

ACTION

• Does the shift shock occur only when the

engine is cold?

Yes

Go to the next step.

Go to Step 3.

• Inspect the TFT sensor and related wiring

harness: vibration, intermittent open/short
circuit.
(See 05-17-12 TRANSAXLE FLUID
TEMPERATURE (TFT) SENSOR
INSPECTION[AW6A-EL, AW6AX-EL].)

• Is it normal?

Yes

Go to the next step.

Repair or replace part if necessary.

• Perform the initial learning procedure.

(See 05-03-22 Initial Learning.)

• Does symptom eliminate?

Yes

Troubleshooting is completed.

Go to the next step.

• Is the line pressure normal?

(See 05-17-3 MECHANICAL SYSTEM
TEST[AW6A-EL, AW6AX-EL].)

Yes

Go to the next step.

Repair or replace any malfunctioning parts according to the
inspection results.

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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–22

Initial Learning

Warning

• When performing initial learning, be aware of other vehicles, people, and other impediments in

order to avoid an accident.

Note

• While self-learning control gradually reduces shock during normal driving, initial learning is performed to

initially learn a certain amount of driving conditions.

1. Warm-up

• Increase the ATF temperature by leaving the vehicle idling or performing city driving. Verify that the ATF

temperature is between 66— 110

°C {151— 230 °F}. If the ATF temperature is outside this range, work to

bring it inside the range.

Caution

• Do not raise the ATF temperature by stalling the engine.

Note

• If the ATF temperature is not between 66— 110 °C {151— 230 °F}, initial learning cannot be performed.

Before learning, inspect for variable shift shock.

2. Garage shift learning

• With the vehicle standing still, depress the brake pedal and keep the selector lever in N position for 3 s.

Then, shift the selector lever from the N position into D range, and maintain in this condition for 3 s. Repeat
this procedure 5 times. Then repeat it 5 times in the same way for R position.

3. Gear shift control learning

• In D range, with the accelerator opening between 25— 30%, drive until you reach 6th gear and a vehicle

speed of 80 km/h {50 mph} or higher. Then, release the accelerator pedal and coast, and bring the vehicle
to a stop in at least 60 s. Repeat this procedure 10 times.

4. Inspect learning results

• Verify that variable speed shock and shift shock have decreased compared to the conditions before

learning.

End Of Sie

• Is stall speed normal?

(See 05-17-3 MECHANICAL SYSTEM
TEST[AW6A-EL, AW6AX-EL].)

Yes

Go to the next step.

Repair or replace any malfunctioning parts according to the
inspection results.

• Stop the engine.

• Inspect following solenoids.

(See 05-17-20 SOLENOID VALVE
INSPECTION[AW6A-EL, AW6AX-EL].)
— Line pressure control solenoid

— Shift solenoid C

— Shift solenoid E

• Are they normal?

Yes

Inspect the ATF condition.

• If a large amount of metal specks are found, replace the

transaxle.
(See 05-17-29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

• If a large amount of metal specks are not found, replace

the control valve body.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

• Replace the control valve body.

(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

• Verify test results.

— If normal, return to the diagnostic index to service any additional symptoms.

— If malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform

repair or diagnosis.

• If the vehicle is repaired, troubleshooting completed.

• If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM.

STEP

INSPECTION

ACTION

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