Mazda 6. Manual — part 208

• Is it okay?

Yes Go to next step.

Replace ATF, then go to Step 8.

K–74

ON-BOARD DIAGNOSTIC

End Of Sie

CHECK ATF LEVEL

• Start engine.

• Warm up ATX.

• Is ATF level within specification?

(See

SOLENOID VALVE INSPECTION

Yes Go to next step.

Adjust ATF level, then go to Step 8.

INSPECTION SHIFT SOLENOID VALVE A AND
C FOR CLICK SOUND

• Perform inspection of operation. (See

K–26

• Verify the click sound of shift solenoid A and C

when applying B+ to each transaxle connector
terminal.

• Was click heard from solenoids?

Yes Go to next step.

Replace solenoid that you could not hear click sound, then
go to Step 8.
(See

K–28 SOLENOID VALVE REMOVAL/

INSPECT LINE PRESSURE

• Start engine.

• Measure line pressures.

Specification
Idle: 330—470 kPa {3.4—4.7 kgf/cm

, 49—66

psi}
Stall: 1,160—1,320 kPa {11.9—13.4 kgf/cm

170—190 psi}

• Is line pressure within specification?

(See

K–6 Line Pressure Test

Yes Go to next step.

All ranges: Replace oil pump, then go to Step 8.
Any ranges: Replace control valve body, then go to Step 8.
(See

K–29 AUTOMATIC TRANSAXLE REMOVAL/

INSPECT STALL SPEED

• Measure stall speed in D range.

(See

K–7 Stall Test

Specification
2,000—2,600 rpm

• Is stall speed within specification?

Yes Go to next step.

Replace automatic transaxle, then go to Step 8.
(See

INSPECT FREQUENCY OF INPUT/TURBINE
SPEED SENSOR WHEN DRIVING VEHICLE

• Turn ignition key to OFF.

• Connect WDS or equivalent.

• Start engine.

• Measure frequency of input/turbine speed

sensor while driving vehicle under the following
conditions:
— Vehicle speed (VSS PID): 60 km/h {37

mph}

— Drive in D range, 3rd gear
— Throttle opening angle (TP PID): about 25%

• Was frequency of input/turbine speed sensor at

approx. 1,200 Hz?

Yes Go to next step.

Replace control valve body, then go to next step.
(See

K–52 AFTER REPAIR PROCEDURE

VERIFY REPAIR OF DTC P0733

• Make sure to reconnect all disconnected

connectors.

• Clear DTC using WDS or equivalent.

• Start engine.

• Warm up transaxle.

• Drive vehicle under the following conditions for

more than 2 seconds.
— ATF temperature: 20

°C {68 °F} or above

— Drive in D range, 3rd gear
— Vehicle speed (VSS PID): 4 km/h {3 mph}

or above

• Are any DTCs present?

Yes Replace PCM, then go to next step.

Go to next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform “After Repair Procedure”.

(See

• Are any DTCs present?

Yes Go to applicable DTC inspection.

Troubleshooting completed.

STEP

INSPECTION

ACTION

ON-BOARD DIAGNOSTIC

K–75

DTC P0734

A6E567001030W16

Diagnostic procedure

DTC P0734

Gear 4 incorrect (Incorrect Gear Ratio Detected)

DETECTION

CONDITION

• PCM monitors revolution ratio of forward clutch drum revolution to differential gear case revolution when the

following monitoring conditions are met. If revolution ratio is below 0.6 or above 1.249, PCM determines
that there is malfunction.

Monitoring condition:

— ATF temperature 20

°C {68 °F} or above.

— Driving in 4 GR in D range.
— Engine run.
— Turbine speed within 225—4,988 rpm.
— Vehicle speed 50 km/h {31 mph} or above.
— Closed throttle position.
— Differential gear case (output) revolution speed 35 rpm or above.
— Any of the following not generated: DTC P0500, P0706, P0707, P0708, P0712, P0713, P0715, P0751,

P0752, P0753, P0756, P0757, P0758, P0761, P0762, P0763, P0766, P0767, P0768, P0771, P0772,
P0773.

Diagnostic support note:

• This is a continuous monitor (CCM).

• MIL does not illuminate.

• HOLD indicator light flashes if PCM detects the above malfunction condition during first drive cycle.

• FREEZE FRAME DATA is not available.

• Pending code is not available.

• DTC stored in the PCM memory.

POSSIBLE

CAUSE

• ATF level low

• Deteriorated ATF

• Shift solenoids A, B or C stuck

• Pressure control solenoid stuck

• Line pressure low

• 2-4 brake band slipping

• 3-4 clutch slipping

• Forward clutch slipping

• Control valve stuck (Bypass or 3-4 shift valve)

• Oil pump

• PCM malfunction

STEP

INSPECTION

ACTION

VERIFY RELATED REPAIR INFORMATION
AVAILABILITY

• Check for related Service Bulletins availability.

• Is any related repair information available?

Yes Perform repair or diagnosis according to available repair

information.

Go to next step.

CHECK ATF CONDITION

• Check ATF condition.

(See

• Is it okay?

Yes Go to next step.

Replace ATF, then go to Step 8.

CHECK ATF LEVEL

• Start engine.

• Warm up ATX.

• Is ATF level within specification?

(See

SOLENOID VALVE INSPECTION

Yes Go to next step.

Adjust ATF level, then go to Step 8.

INSPECT SHIFT SOLENOID VALVE A AND D
FOR CLICK SOUND

• Perform inspection of operation. (See

K–26

• Verify the click sound of shift solenoids A and D

when applying B+ to each transaxle connector
terminal.

Note

• Click from solenoid D is barely audible.

Remove solenoids to correctly inspect if
necessary.

• Was click heard from solenoids?

Yes Go to next step.

Replace solenoid that you could not hear click sound, then
go to Step 8.
(See

K–28 SOLENOID VALVE REMOVAL/

K–76

ON-BOARD DIAGNOSTIC

End Of Sie

INSPECT LINE PRESSURE

• Start engine.

• Measure line pressures.

Specification
Idle: 330—470 kPa {3.4—4.7 kgf/cm

, 49—66

psi}
Stall: 1,160—1,320 kPa {11.9—13.4 kgf/cm

170—190 psi}

• Is line pressure within specification?

(See

K–6 Line Pressure Test

Yes Go to next step.

All ranges: Replace oil pump, then go to Step 8.
Any ranges: Replace control valve body, then go to Step 8.
(See

K–29 AUTOMATIC TRANSAXLE REMOVAL/

INSPECT STALL SPEED

• Measure stall speed in D range.

(See

K–7 Stall Test

Specification
2,000—2,600 rpm

• Is stall speed within specification?

Yes Go to next step.

Replace automatic transaxle, then go to Step 8.
(See

INSPECT FREQUENCY OF INPUT/TURBINE
SPEED SENSOR WHEN DRIVING VEHICLE

• Turn ignition key to OFF.

• Connect WDS or equivalent.

• Start engine.

• Measure frequency of input/turbine speed

sensor while driving vehicle under the following
conditions:
— Vehicle speed (VSS PID): 80 km/h {49

mph}

— Drive in D range, 4th gear
— Throttle opening angle (TP PID): about 25%

• Was frequency of input/turbine speed sensor at

approx. 1,200 Hz?

Yes Go to next step.

Replace control valve body, then go to next step.
(See