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DTC P1784:00 [TCM (ET6A-EL, ET6AX-EL) (E)]

DTC P1784:00 [TCM (ET6A-EL, ET6AX-EL) (E)]

 id0502q99052r2

Outline

System malfunction location

Hi cut valve stuck off/R-3-5 cut valve stuck on
Detection condition
•  Under the following conditions, hi cut valve stuck-off or R-3-5 cut valve stuck-on detected by combination of gear ratio malfunction and oil pressure switch pattern malfunction:
―  Engine is running.
―  ATF temperature is 20 °C {68 °F} 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.
―  Turbine/input shaft speed sensor and output shaft speed sensor DTC is not recorded.
Fail-safe
•  Inhibits malfunctioning gear.
•  Limits engine torque.
•  Inhibits learning control.
•  Inhibits i-stop control.
•  Inhibits neutral idle control.
Possible cause
•  ATF is less than specified value
•  Hi cut valve malfunction
•  R-3-5 cut valve malfunction
•  Clutch burnt
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 the next step.
(See AUTOMATIC TRANSAXLE FLUID (ATF) ADJUSTMENT [ET6A-EL, ET6AX-EL (E)].)
No
Replace the automatic transaxle.
(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)].)
3
PERFORM STALL TEST TO VERIFY DTCs
•  Clear the DTC using the M-MDS.
•  Perform the stall test in the reverse (R) position.
•  Perform the DTC inspection using the M-MDS.
•  Are any DTCs present?
Yes
Replace the automatic transaxle.
(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)].)
No
Go to the next step.
Repair completion verification
PERFORM ON-BOARD DIAGNOSTIC TEST
•  Perform the on-board diagnostic test.
•  Are any DTCs present?
Yes
Replace the automatic transaxle.
(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)].)
No
Drive the vehicle for 10 min or more.
DTCs are displayed:
•  Replace the automatic transaxle.
No DTCs are displayed:
•  DTC troubleshooting completed.