DTC P1784:00 [FW6A-EL]


id050225905200

DTC P1784:00

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 difference between vehicle speed signal from DSC HU/CM and output shaft speed sensor signal.
―  Turbine/input shaft speed sensor and output shaft speed sensor DTC is not recorded.
FAIL-SAFE FUNCTION
•  Inhibits malfunctioning gear.
•  Limits engine torque.
•  Inhibits learning control.
•  Inhibits neutral idle control.
•  Inhibits i-stop 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

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service 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.
No
Replace the automatic transaxle.
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.
No
Go to the next step.
4
PERFORM ON-BOARD DIAGNOSTIC TEST
•  Perform the on-board diagnostic test.
•  Are any DTCs present?
Yes
Replace the automatic transaxle.
No
Drive the vehicle for 10 min or more.
DTCs are displayed:
•  Replace the automatic transaxle.
No DTCs are displayed:
•  DTC troubleshooting completed.