Mazda 6. Manual - part 209

K–12 Automatic Transaxle Fluid (ATF)

Condition Inspection

Yes Go to next step.

If ATF color milky or reddish brown, replace ATF, then go to
Step 4.
(See

K–13 AUTOMATIC TRANSAXLE FLUID (ATF)

REPLACEMENT

CHECK ATF LEVEL

• Start engine.

• Warm up ATX.

• Is ATF level within specification?

Yes Go to next step.

Adjust ATF level, then go to Step 6.
(See

INSPECT LINE PRESSURE

• Start engine.

• Measure line pressure.

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?

K–29 AUTOMATIC TRANSAXLE REMOVAL/

K–6 Line Pressure Test

Yes Go to next step.

• All ranges: Replace oil pump or control valve body, then

go to Step 6.

• Any ranges: Replace ATX, then go to Step 6.

(See

INSTALLATION

(See ATX Workshop Manual FN4A-EL (9999-95-FN4A-
99).)

K–78

ON-BOARD DIAGNOSTIC

End Of Sie

DTC P0742

A6E567001030W18

CHECK OPERATION OF EACH VALVE AND
EACH SPRING

• Turn ignition key to OFF.

• Remove control valve body.

• Disassemble control valve body.

• Is each valve operation okay and is return

spring okay?

(See

K–35 CONTROL VALVE BODY INSTALLATION

(See ATX Workshop Manual FN4A-EL (9999-95-
FN4A-99).)

Yes Replace ATX, then go to next step

(See ATX Workshop Manual FN4A-EL (9999-95-FN4A-
99).)

Repair or replace shift valve and return spring, then go to
next step.
(See

CONTROL VALVE BODY INSTALLATION

K–35

(See ATX Workshop Manual FN4A-EL (9999-95-FN4A-
99).)

VERIFY TROUBLESHOOTING OF DTC P0741
COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Clear DTC from memory using WDS or

equivalent.

• Start engine.

• Warm up engine and ATX.

• Drive vehicle under following conditions for 5

seconds or more.
— ATF temperature: 20

°C {68 °F} or above

— Drive in D range, 4th gear (TCC operation)
— Vehicle speed (VSS PID): within 60—100

km/h {37—62 mph}

• Are any DTCs present?

Yes Replace PCM, then go to next step.

(See

F–43 PCM REMOVAL/INSTALLATION

Go to next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform “After Repair Procedure”.

(See

K–52 AFTER REPAIR PROCEDURE

• Are any DTCs present?

Yes Go to applicable DTC inspection.

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0742

Torque converter clutch (TCC) stuck ON

DETECTION

CONDITION

• All of following conditions satisfied under each of following throttle conditions.

— ATF temperature 20

°C {68 °F} or above.

— Driving in 4GR at D range.
— Engine run.
— Turbine speed within 225—4,988 rpm.
— Vehicle speed below 70 km/h {43 mph}.
— Torque converter clutch (TCC) no operation
— Difference between engine speed and turbine speed below 50 rpm
— DTC P0734 not output

• Throttle conditions.

— Throttle opening angle (TP PID) above 10.1% and 5 seconds or more have passed.
— Throttle opening angle (TP PID) within 3.1—10.1% and 3 seconds or more have passed.
— Throttle opening angle at closed throttle position and 5 seconds or more have passed.

Diagnostic support note:

• This is a continuous monitor (CCM).

• MIL does not illuminate if PCM detects the above malfunction conditions during first drive cycle.

• PENDING CODE is not available.

• FREEZE FRAME DATA is not available.

• HOLD indicator light flashes.

• DTC is stored in the PCM memory.

POSSIBLE

CAUSE

• ATF level low

• Deteriorated ATF

• Shift solenoids A, B, C, D, E, and pressure control solenoid stuck

• Line pressure low

• 2-4 brake band slipping

• 3-4 clutch slipping

• Control valve stuck

• PCM malfunction

ON-BOARD DIAGNOSTIC

K–79

Diagnostic procedure

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.

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

Go to next step.

CHECK ATF CONDITION

• Turn ignition key to OFF.

• Check ATF condition.

— Clear red: Normal
— Milky: Water mixed in fluid
— Reddish brown: Deteriorated ATF

• Is it okay?

K–12 Automatic Transaxle Fluid (ATF)

Condition Inspection

Yes Go to next step.

If ATF color milky or reddish brown, replace ATF, then go to
Step 4.
(See

K–13 AUTOMATIC TRANSAXLE FLUID (ATF)

REPLACEMENT

CHECK ATF LEVEL

• Start engine.

• Warm up ATX.

• Is ATF level within specification?

Yes Go to next step.

Adjust ATF level, then go to Step 6.
(See

INSPECT LINE PRESSURE

• Start engine.

• Measure line pressure.

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?

K–29 AUTOMATIC TRANSAXLE REMOVAL/

K–6 Line Pressure Test

Yes Go to next step.

• All ranges: Replace oil pump or control valve body, then

go to Step 6.

• Any ranges: Replace ATX, then go to Step 6.

(See

INSTALLATION

(See ATX Workshop Manual FN4A-EL (9999-95-FN4A-
99).)

CHECK OPERATION OF EACH VALVE AND
EACH SPRING

• Turn ignition key to OFF.

• Remove control valve body.

• Disassemble control valve body.

• Is each valve operation okay and is return

spring okay?

K–35 CONTROL VALVE BODY INSTALLATION

(See ATX Workshop Manual FN4A-EL (9999-95-
FN4A-99).)

Yes Replace ATX, then go to next step.

(See

K–29 AUTOMATIC TRANSAXLE REMOVAL/

INSTALLATION

(See ATX Workshop Manual FN4A-EL (9999-95-FN4A-
99).)

Repair or replace shift valve and return spring, then go to
next step.
(See