Mazda CX 7. Manual — part 228

ON-BOARD DIAGNOSTIC [AW6A-EL, AW6AX-EL]

05-02–21

05-02

Diagnostic procedure

POSSIBLE

CAUSE

• VSS malfunction

• Open circuit between VSS terminal B and TCM terminal B19

• Open circuit between VSS terminal A and TCM terminal B20

• Short to ground in wiring harness between VSS terminal B and TCM terminal B19

• Short to ground in wiring harness between VSS terminal A and TCM terminal B20

• Short to power in wiring harness between VSS terminal B and TCM terminal B19

• Short to power in wiring harness between VSS terminal A and TCM terminal B20

• Damaged connector between VSS and TCM

• TCM malfunction

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED

• Has the FREEZE FRAME DATA been

recorded?

Yes

Go to the next step.

Record the FREEZE FRAME DATA on the repair order,
then go to the next step.

VERIFY RELATED REPAIR INFORMATION
AVAILABILITY

• Verify related Service Bulletins and/or on-line

repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available
repair information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

INSPECT TERMINAL COUPLE COMPONENT
FOR POOR CONNECTION

• Turn the ignition switch to the LOCK position.

• Remove the TCM.

(See 05-17-25 TCM REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

• Inspect for poor connection (such as damaged/

pulled-out pins, corrosion).

• Are terminals normal?

Yes

Go to the next step.

Replace the couple component, then go to Step 8.

DTC P0722

Vehicle speed sensor (VSS) circuit malfunction (open circuit/short circuit)

B19

B20

VSS

VSS WIRING HARNESS-SIDE CONNECTOR

TCM

COUPLE COMPONENT CONNECTOR

COUPLE COMPONENT

B20

B19

(+)

(-)

1871-1U-06B(05-02).fm 21 ページ２００６年３月１５日水曜日午前１１時１８分

ON-BOARD DIAGNOSTIC [AW6A-EL, AW6AX-EL]

05-02–22

End Of Sie

DTC P0729[AW6A-EL, AW6AX-EL]

id050211801700

INSPECT CONTINUITY OF VSS CIRCUIT

• Inspect for continuity between the couple

component terminals B19 and B20 (wiring
harness-side).

• Is there continuity?

Yes

Go to go to Step 8.

Go to the next step.

INSPECT TERMINAL VSS FOR POOR
CONNECTION

• Disconnect the VSS connector.

• Inspect for poor connection (such as damaged/

pulled-out pins, corrosion).

• Are terminals normal?

Yes

Go to the next step.

Replace the couple component, then go to Step 8.

INSPECT TERMINAL COUPLE COMPONENT
CIRCUIT FOR OPEN CIRCUIT

• Inspect for continuity between couple

component terminals (wiring harness-side) and
VSS terminals (wiring harness-side).
— Terminal B19 and terminal B

— Terminal B20 and terminal A

• Is there continuity?

Yes

Go to the next step.

Repair or replace the couple component, then go to Step 8.

INSPECT TERMINAL COUPLE COMPONENT
CIRCUIT FOR SHORT TO CIRCUIT

• Inspect for continuity between couple

component terminals (wiring harness-side).

— Terminal B19 and all terminals except B19/

B20 (wiring harness-side).

— Terminal B20 and all terminals except B19/

B20 (wiring harness-side).

• Is there continuity?

Yes

Repair or replace the couple component, then go to the
next step.

Inspect the coupler component.

• If the coupler component is normal, replace the

automatic transaxle, then go to the next step.
(See05-17-29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

VERIFY TROUBLESHOOTING OF DTC P0722
COMPLETED

• Make sure to reconnect all the disconnected

connectors.

• Clear the DTC from the memory using the M-

MDS.

• Drive the vehicle in D range and make sure

that gears shift smoothly from 1GR to 6GR.

• Is same DTC present?

Yes

Replace the TCM, then go to the next step.
(See 05-17-25 TCM REMOVAL/INSTALLATION[AW6A-EL,
AW6AX-EL].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “After Repair Procedure”.

(See 05-02-4 AFTER REPAIR
PROCEDURE[AW6A-EL, AW6AX-EL].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.
(See 05-02-5 DTC TABLE[AW6A-EL, AW6AX-EL].)

DTC troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0729

Gear 6 incorrect (incorrect gear ratio detected)

DETECTION

CONDITION

• Incorrect gear ratio detected when following conditions are satisfied while driving:

Monitoring condition:

— ATF temperature 20

°C {68 °F} or more

— Driving in 6GR in D range

— Engine running

— Accelerator opening angle 10% or more

— Vehicle speed signal normal

Diagnostic support note:

• This is a continuous monitor (CCM).

• The MIL illuminates if the TCM detects the above malfunction condition during the first drive cycle.

• A PENDING CODE is not available.

• FREEZE FRAME DATA is available.

• The AT warning light illuminates.

• The DTC is stored in the TCM memory.

1871-1U-06B(05-02).fm 22 ページ２００６年３月１５日水曜日午前１１時１８分

ON-BOARD DIAGNOSTIC [AW6A-EL, AW6AX-EL]

05-02–23

05-02

Diagnostic procedure

POSSIBLE

CAUSE

• ATF level low

• Deteriorated ATF

• Shift solenoid C stuck

• Shift solenoid E stuck

• Line pressure control solenoid stuck

• Line pressure low

• B1 brake slipping

• C2 clutch slipping

• Control valve stuck

• Oil pump malfunction

• TCM malfunction

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED

• Has the FREEZE FRAME DATA been

recorded?

Yes

Go to the next step.

Record the FREEZE FRAME DATA on the repair order,
then go to the next step.

VERIFY RELATED REPAIR INFORMATION
AVAILABILITY

• Verify related Service Bulletins and/or on-line

repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available
repair information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

INSPECT ATF CONDITION

• Inspect the ATF condition.

(See 05-17-10 AUTOMATIC TRANSAXLE
FLUID (ATF) INSPECTION[AW6A-EL,
AW6AX-EL].)

• Is it normal?

Yes

Go to the next step.

Replace the transaxle, then go to Step 8.

INSPECT ATF LEVEL

• Start the engine.

• Warm up the ATX.

• Is the ATF level within the specification?

(See 05-17-10 AUTOMATIC TRANSAXLE
FLUID (ATF) INSPECTION[AW6A-EL,
AW6AX-EL].)

Yes

Go to the next step.

Add ATF to the specified level, then go to Step 8.

INSPECT LINE PRESSURE

• Start the engine.

• Measure the line pressures.

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

• Are the line pressures within the

specifications?

Yes

Go to the next step.

All ranges: Replace the oil pump, then go to Step 8.
Any ranges: Replace the control valve body, then go to
Step 8.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

INSPECT STALL SPEED

• Measure the stall speed in D range.

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

• Is the stall speed within the specification?

Yes

Go to the next step.

Replace the automatic transaxle, then go to Step 8.
(See 05-17-29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)

INSPECT SHIFT SOLENOID

• Inspect the shift 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].)

DTC P0729

Gear 6 incorrect (incorrect gear ratio detected)

1871-1U-06B(05-02).fm 23 ページ２００６年３月１５日水曜日午前１１時１８分

ON-BOARD DIAGNOSTIC [AW6A-EL, AW6AX-EL]

05-02–24

End Of Sie

DTC P0730[AW6A-EL, AW6AX-EL]

id050211801800

VERIFY TROUBLESHOOTING OF DTC P0729
COMPLETED

• Make sure to reconnect all the disconnected

connectors.

• Clear the DTC from the memory using the M-

MDS.

• Drive the vehicle under the following conditions

at least 12 times for more than 1 s:

— ATF temperature (TFT PID): 20

°C {68 °F}

or more

— Drive in the D range, 6GR

— Accelerator opening angle (THOP PID):

10% or more

• Is same DTC present?

Yes

Replace the TCM, then go to the next step.
(See 05-17-25 TCM REMOVAL/INSTALLATION[AW6A-EL,
AW6AX-EL].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “After Repair Procedure”.

(See 05-02-4 AFTER REPAIR
PROCEDURE[AW6A-EL, AW6AX-EL].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.
(See 05-02-5 DTC TABLE[AW6A-EL, AW6AX-EL].)

DTC troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0730

Gear 1 and engine brake operation incorrect (incorrect gear ratio detected)

DETECTION

CONDITION

• Engine braking is detected to be not operating when following conditions are satisfied while driving:

Monitoring condition:

— ATF temperature 20

°C {68 °F} or more

— Driving in 1GR in M range

— Engine running

— Accelerator opening angle 10% or more

— Vehicle speed signal normal

Diagnostic support note:

• This is a continuous monitor (CCM).

• The MIL does not illuminate if the TCM detects the above malfunction condition during the first drive cycle.

• A PENDING CODE is not available.

• FREEZE FRAME DATA is available.

• The AT warning light illuminates.

• The DTC is stored in the TCM memory.

POSSIBLE

CAUSE

• ATF level low

• Deteriorated ATF

• Shift solenoid A stuck

• Shift solenoid B stuck

• Shift solenoid D stuck

• Shift solenoid E stuck

• Shift solenoid F stuck

• Line pressure control solenoid stuck

• Line pressure low

• C1 clutch slipping

• B2 brake slipping

• Control valve stuck

• Oil pump malfunction

• TCM malfunction

1871-1U-06B(05-02).fm 24 ページ２００６年３月１５日水曜日午前１１時１８分

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Mazda CX 7. Manual — part 228

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