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Mazda CX 7. Manual - part 251

SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–23

05-03

NO.18 EXCESSIVE SHIFT SHOCK IS GIVEN WHEN UPSHIFTING AND DOWNSHIFTING[AW6A-EL, AW6AX-
EL]

id050310802300

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NO.19 EXCESSIVE SHIFT SHOCK ON TORQUE CONVERTER CLUTCH (TCC)[AW6A-EL, AW6AX-EL]

id050310802400

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NO.20 NOISE OCCURS AT IDLE WHEN VEHICLE IS STOPPED IN ALL POSITIONS/RANGES[AW6A-EL,
AW6AX-EL]

id050310802500

Diagnostic procedure

End Of Sie

Excessive shift shock is given when upshifting and downshifting

DESCRIPTION

• Excessive shift shock is felt when depressing the accelerator pedal at upshifting.

• During cruising, excessive shift shock is felt when depressing accelerator pedal at downshifting.

POSSIBLE

CAUSE

• Shift shock may worsen when the fail-safe is operating. The shift shock may worsen if the accelerator

pedal position sensor, APP sensor, input/turbine speed sensor, or VSS signal malfunctions.
— Clutch slippage, burnt (C1 clutch, C2 clutch, C3 clutch, B1 brake)

• Line pressure low, high

• Incorrect accelerator opening signal

• VSS malfunction

• Input/turbine speed sensor malfunction

• TFT sensor 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 and sensor GND malfunction

• Control valve body malfunction

— Poor hydraulic operation (Malfunction in range change)

Excessive shift shock on torque converter clutch (TCC)

DESCRIPTION

• Strong shock is felt when the TCC is engaged.

POSSIBLE

CAUSE

• The troubleshooting flow is the same as No.16 “JUDDER UPON TORQUE CONVERTER CLUTCH

(TCC) OPERATION”.

Noise occurs at idle when vehicle is stopped in all positions/ranges

DESCRIPTION

• Transaxle is noisy in all positions and ranges when the vehicle is idling.

POSSIBLE

CAUSE

• The malfunction is in the pressure solenoid or oil pump which causes a high-pitched noise to be emitted

from the transaxle at idle.

Note

• If a noise is emitted during shifting only, the malfunction is in the C1 clutch, C2 clutch, C3 clutch

or B1 brake.

• If a noise is emitted during shifting at certain gears only or during deceleration only, it is gear

noise.

• 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

• Inspect engine condition.

• Is there any engine concern (e.g. Rough

idle)?

Yes

Go to appropriate symptom troubleshooting.
(See 01-03-5 ENGINE SYMPTOM
TROUBLESHOOTING[L3 WITH TC].)

Replace basic inspection and repair or replace any
malfunctioning parts according to the inspection result

• 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.

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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–24

NO.21 NOISE OCCURS AT IDLE WHEN VEHICLE IS STOPPED IN D RANGE, OR IN R POSITION[AW6A-EL,
AW6AX-EL]

id050310802600

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NO.22 NO ENGINE BRAKING IN 1GR POSITION OF M RANGE[AW6A-EL, AW6AX-EL]

id050310802700

Diagnostic procedure

End Of Sie

Noise occurs at idle when vehicle is stopped in D range, or in R position

DESCRIPTION

• Transaxle is noisy in driving ranges when vehicle idling.

POSSIBLE

CAUSE

• Although the malfunction is basically the same as No.20 “NOISE OCCURS AT IDLE WHEN VEHICLE

IS STOPPED IN ALL POSITIONS/RANGES”, other causes may include selector lever position disparity
or TR switch position disparity.

No engine braking in 1GR position of M range

DESCRIPTION

• Engine speed drops to idle but the vehicle coasts when the accelerator pedal is released during

cruising at medium to high speeds.

• Engine speed drops to idle but the vehicle coasts when accelerator pedal is released when in M range

(1GR) at low vehicle speed.

POSSIBLE

CAUSE

• Clutch slippage, burnt (B2 brake)

— Line pressure low

• VSS malfunction

• Input/turbine speed sensor malfunction

• Shift solenoid A or B malfunction

• Sensor 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].)

STEP

INSPECTION

ACTION

• Do the following symptoms occur

concurrently?
— Engine flares up or slips during

acceleration

— Engine flares up or slips when shifting

Yes

Go to No.14 “ENGINE FLARES UP OR SLIPS WHEN
UPSHIFTING OR DOWNSHIFTING”, or No.15 “ENGINE
FLARES UP OR SLIPS WHEN ACCELERATING
VEHICLE”.

Go to the next step.

• Stop the engine.

• Inspect following solenoids.

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

— Shift solenoid B

• Are the 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.

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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–25

05-03

NO.23 TRANSAXLE OVERHEATS[AW6A-EL, AW6AX-EL]

id050310802800

Diagnostic procedure

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TRANSAXLE OVERHEATS

DESCRIPTION

• Burnt smell emitted from transaxle.

• Smoke emitted from transaxle.

POSSIBLE

CAUSE

• The malfunction is restricted to the hindrance of coolant at the oil cooler. In addition, overheating of the

transaxle may be caused by a malfunction of the TFT sensor.
— Line pressure low

• ATF level low

• Incorrect accelerator opening signal

— Oil cooler malfunction (Foreign material mixed in with ATF)

— TFT sensor malfunction

— Excessive amount of ATF

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

• 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 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.

• 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.

• Inspect the line pressure control solenoid.

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

• Is it 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].)

• Inspect for bending, damage, corrosion or

kinks of the oil cooler pipes.

• Are oil cooler pipes normal?

Yes

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

Replace any malfunctioning parts.

• 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.

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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–26

NO.24 ENGINE STALLS WHEN SHIFTED TO D RANGE, OR IN R POSITION[AW6A-EL, AW6AX-EL]

id050310802900

Diagnostic procedure

End Of Sie

NO.25 ENGINE STALLS WHEN DRIVING AT SLOW SPEED OR STOPPING[AW6A-EL, AW6AX-EL]

id050310803000

Diagnostic procedure

End Of Sie

Engine stalls when shifted to D range, or in R position

DESCRIPTION

• Engine stalls when shifting from N or P position to D range or R position at idle.

POSSIBLE

CAUSE

• The malfunction is on the engine control side (e.g. electronic controlled throttle system). Otherwise, the

malfunction is in the input/turbine speed sensor (engine sometimes starts) or the TCC circuit (engine
always stalls).

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

• Go to symptom troubleshooting No.5

“ENGINE STALLS-AFTER START/AT IDLE”.
(See 01-03-23 NO.5 ENGINE STALLS-
AFTER START/AT IDLE[L3 WITH TC].)

• Is the engine control system normal?

Yes

Go to the next step.

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

• 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 for bending, damage, corrosion or kinks of the oil
cooler pipes.

• If normal, replace the control valve body.

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

• If problem remains, replace the transaxle.

(See 05-17-29 AUTOMATIC TRANSAXLE 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.

Engine stalls when driving at slow speeds or stopping

DESCRIPTION

• Engine stalls when the brake pedal is depressed while driving at low speed or stopping.

POSSIBLE

CAUSE

• The malfunction is in the engine control system (e.g. Fuel injection control, electronic controlled throttle

system)

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

• Go to symptom troubleshooting No.10 “LOW

IDLE/STALLS DURING DECELERATION”.
(See 01-03-39 NO.10 LOW IDLE/STALLS
DURING DECELERATION[L3 WITH TC].)

• Is the engine control system normal?

Yes

Go to No.24 “ENGINE STALLS WHEN SHIFTED TO D
RANGE, OR IN R POSITION”.

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

• 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.

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