Mazda CX 7. Manual — part 249

SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–15

05-03

*

: If case of shift solenoid C failure

End Of Sie

NO.7 NO SHIFTING[AW6A-EL, AW6AX-EL]

id050310801200

*

: If case of shift solenoid C failure

End Of Sie

5

• 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

7

No shifting

DESCRIPTION

• Single shift range only.

• Sometimes it shifts correctly.

POSSIBLE

CAUSE

• When the gear position is fixed in 3GR or 5GR* due to the fail-safe operation, malfunction is in the ATX.

• Perform malfunction diagnosis according to No.6 “LOW MAXIMUM SPEED AND POOR

ACCELERATION”.
— Clutch burnt (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

• Shift solenoid F malfunction

• Control valve body malfunction

— 3GR or 5GR* is fixed (Operation in fail-safe function)

• Short or open circuit in wiring harness

• Poor connection of connector

• Poor ground of shift solenoid

• Malfunction of electronic parts of output and input system

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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–16

NO.8 DOES NOT SHIFT TO 6GR[AW6A-EL, AW6AX-EL]

id050310801300

Diagnostic procedure

8

Does not shift to 6GR

DESCRIPTION

• Vehicle does not upshift from 5GR to 6GR even though vehicle speed is increased.

• Vehicle does not shift to 6GR even though accelerator pedal is released in D range at 80 km/h {50

mph}.

POSSIBLE

CAUSE

• Basically, TCC does not operate when the fail-safe is operating. Verify the DTC at first. If the TCC

operates when driving at high speeds only, the malfunction (improper adjustment) is in the M range
switch circuit or TR switch circuit.

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

— TFT sensor malfunction

• Short or open circuit in wiring harness

• Poor connection of connector

• Sensor malfunction

— TR switch malfunction

• Selector lever adjustment incorrect

• TR switch adjustment incorrect

— TCC control solenoid malfunction

• Short or open circuit in wiring harness

• Poor connection of connector

• Solenoid valve stuck

— M range switch malfunction

• Selector lever adjustment incorrect

• Short or open circuit in wiring harness

— Torque converter 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

1

• With the ignition switch at the ON position.

• Does the gear position indicator light

indication correspond to selector lever
position?

Yes

Go to the next step.

No

Go to No.27 “GEAR POSITION INDICATOR LIGHT DOES
NOT ILLUMINATE IN M RANGE”, or No.28 “GEAR
POSITION INDICATOR LIGHT ILLUMINATES IN D RANGE
OR P, N, R POSITIONS”.

2

• Drive the vehicle in D range and inspect

following:
— 1–2 shift up and down

— 2–3 shift up and down

— 3–4 shift up and down

— 4–5 shift up and down

— 5–6 shift up and down

• Are all shift-up and shift-down possible?

Yes

Go to the next step.

No

No shift at all:

• Go to No.7 “NO SHIFTING”.

Abnormal shift:

• Go to No.9 “ABNORMAL SHIFTING”.

3

• Stop the engine.

• Inspect following solenoid.

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

— Shift solenoid D

— Shift solenoid E

— Shift solenoid F

— Line pressure control solenoid

• Are they normal?

Yes

Go to the next step.

No

Inspect for shift solenoid stuck.
(See 05-17-20 SOLENOID VALVE INSPECTION[AW6A-EL,
AW6AX-EL].)

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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]

05-03–17

05-03

End Of Sie

NO.9 ABNORMAL SHIFTING[AW6A-EL, AW6AX-EL]

id050310801400

Diagnostic procedure

4

• 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].)

No

Replace the torque converter.

5

• 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

9

Abnormal shifting

DESCRIPTION

• Shift incorrectly (incorrect shift pattern).

POSSIBLE

CAUSE

• There is a malfunction in the signal circuit which controls shifting (Accelerator opening signal, input/

turbine speed sensor, VSS), the control valve is stuck, or the clutch circuit is stuck.

— Clutch slippage, burnt (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

• TR switch adjustment incorrect

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

1

• Inspect for continuity between the TCM

terminal A9 and battery negative terminal.

• Is there continuity?

Yes

Go to the next step.

No

Repair or replace ground circuit.

2

• Inspect following shift 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 TCM terminal for bend, damage, corrosion or
poor contact.

No

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

3

• 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]

05-03–18

End Of Sie

NO.10 FREQUENT SHIFTING[AW6A-EL, AW6AX-EL]

id050310801500

End Of Sie

NO.11 SHIFT POINT IS HIGH OR LOW[AW6A-EL, AW6AX-EL]

id050310801600

End Of Sie

NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION[AW6A-EL, AW6AX-EL]

id050310801700

Diagnostic procedure

10

Frequent shifting

DESCRIPTION

• Downshifting occurs suddenly even when accelerator pedal is depressed slightly in D range.

POSSIBLE

CAUSE

• The malfunctioning circuit is basically the same as No.9 “ABNORMAL SHIFTING”. However, a

malfunction of the input signal to the accelerator pedal position sensor, APP sensor, input/turbine speed
sensor, VSS (including the sensor GND, sensor wiring harness and connector), or clutch slippage
(clutch stuck, low pressure in line) may also be the cause.

11

Shift point is high or low

DESCRIPTION

• Shift point considerably different from automatic shift diagram.

• Shift delays when accelerating.

• Shift occurs quickly when accelerating and engine speed does not increase.

POSSIBLE

CAUSE

• If the transaxle does not shift abnormally, there is a malfunction of the input signal to the APP sensor,

input/turbine speed sensor, or VSS.

• If the engine speed is high or low, regardless of normal shifting, inspect the tachometer.

• Verify that the output signals of the accelerator pedal position sensor and APP sensor change linearly.

12

Torque converter clutch (TCC) non-operation

DESCRIPTION

• TCC does not operate when vehicle reaches TCC operation range.

POSSIBLE

CAUSE

• Basically, TCC does not operate when the fail-safe is operating. Verify the DTC at first. If the TCC

operates when driving at high speeds only, the malfunction (improper adjustment) is in the M range
switch circuit or TR switch circuit.

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

• Input/turbine speed sensor malfunction

• VSS malfunction

• Output solenoid valve system malfunction (Sticking)

• TCC control solenoid malfunction

• Control valve body system malfunction (Poor operation, sticking)

• TCC hydraulic pressure system malfunction

• Accelerator pedal position sensor malfunction (Not operating linearly)

• Input/turbine speed sensor or VSS malfunction

• Operation of fail-safe function.

— Short to power or GND at TCC control solenoid related circuit.

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

1

• With the ignition switch at the ON position.

• Does the gear position indicator light

indication correspond to the selector lever
position?

Yes

Go to the next step.

No

Go to No.27 “GEAR POSITION INDICATOR LIGHT DOES
NOT ILLUMINATE IN M RANGE”, or No.28 “GEAR
POSITION INDICATOR LIGHT ILLUMINATES IN D RANGE
OR P, N, R POSITIONS”.

2

• Disconnect the TCM.

• Is the resistance between the TCM ground

terminal A9 and the body GND less than 5.0
ohms?

Yes

Go to the next step.

No

Repair open ground circuit.

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