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

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.
1		No	Go to the next step.
2	INSPECT ATF LEVEL • Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FW6A-EL].) • Is there any malfunction?	Yes	Adjust the ATF level to the specification, then go to the next step. (See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FW6A-EL].)
2		No	Replace the automatic transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FW6A-EL].)
3	PERFORM STALL TEST TO VERIFY DTCs • Clear the DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FW6A-EL].) • Perform the stall test in the reverse (R) position. (See MECHANICAL SYSTEM TEST [FW6A-EL].) • Perform the DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FW6A-EL].) • Are any DTCs present?	Yes	Replace the automatic transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FW6A-EL].)
3		No	Go to the next step.
4	PERFORM ON-BOARD DIAGNOSTIC TEST • Perform the on-board diagnostic test. (See ON-BOARD DIAGNOSTIC TEST MODE [FW6A-EL].) • Are any DTCs present?	Yes	Replace the automatic transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FW6A-EL].)
4		No	Drive the vehicle for 10 min or more. DTCs are displayed: • Replace the automatic transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FW6A-EL].) No DTCs are displayed: • DTC troubleshooting completed.