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DTC P1728:00 [TCM (ET6A-EL, ET6AX-EL) (E)]

DTC P1728:00 [TCM (ET6A-EL, ET6AX-EL) (E)]

 id0502q99051r2

Outline

System malfunction location

Clutch slippage
Detection condition
•  Under the following conditions, turbine/input shaft speed suddenly increases 300 rpm or more for 1,450 ms:
―  Engine is running.
―  Vehicle speed is 5 km/h {3 mph} or more.
―  There is no correlation between vehicle speed signal from DSC HU/CM (without Mazda M Hybrid)/electronically controlled brake unit (with Mazda M Hybrid) and output shaft speed sensor signal.
―  Not shifting
―  Selector lever position is D position.
―  Turbine/input shaft speed is 1,200 rpm or more.
―  Oil pressure switch pattern (1st—6th) is normal.
Fail-safe
•  Inhibits malfunctioning gear.
•  Limits engine torque.
•  Maximizes the line pressure.
•  Inhibits learning control.
•  Inhibits manual mode.
•  Inhibits neutral idle control.
•  Inhibits i-stop control.
•  Inhibits AAS.
Possible cause
•  ATF is less than specified value
•  Clutch slippage
System wiring diagram
•  Not applicable
Connector diagram
•  Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action
1
VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY
•  Verify related Service Bulletins, on-line repair information, or Service Information availability.
•  Is any related information available?
Yes
Perform repair or diagnosis according to the available information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
2
INSPECT ATF LEVEL
•  Inspect the ATF level.
•  Is there any malfunction?
Yes
Adjust the ATF level to the specification, then go to repair completion verification.
(See AUTOMATIC TRANSAXLE FLUID (ATF) ADJUSTMENT [ET6A-EL, ET6AX-EL (E)].)
No
Replace the automatic transaxle, then go to repair completion verification.
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [ET6A-EL (SKYACTIV-G 2.0, SKYACTIV-G 2.5) (E)].)
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [ET6AX-EL (SKYACTIV-G 2.0, SKYACTIV-G 2.5) (E)].)
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [ET6A-EL (SKYACTIV-D 1.8)].)
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [ET6AX-EL (SKYACTIV-D 1.8)].)
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [ET6A-EL (SKYACTIV-X 2.0)].)
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [ET6AX-EL (SKYACTIV-X 2.0)].)
Repair completion verification
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Clear the DTC using the M-MDS.
•  Perform the following procedure to ensure that the DTC has been resolved:
1.  Drive the vehicle without shifting for 20 min or more under the following conditions:
•  Vehicle speed: 5 km/h {3 mph} or more
•  Selector lever position: D position
•  Perform the DTC inspection using the M-MDS.
•  Are any DTCs present?
Yes
ATF amount in Step 2 is correct
•  Go to the applicable DTC inspection.
ATF amount adjusted in Step 2:
•  Replace the automatic transaxle, then drive the vehicle to check it, and if there is no problem then the DTC troubleshooting is complete.
No
DTC troubleshooting completed.