DTC P0780:00 [FW6A-EL]

id050225824500

DTC P0780:00

Gear shifting malfunction

DETECTION CONDITION

•  Gear ratio malfunction while in any gear 1st to 6th or clutch-slip DTC (P0729:00, P0731:00, P0732:00, P0733:00, P0734:00, P0735:00, P1728:00) occurs and vehicle is driven under gear ratio malfunction condition from fail-safe, or use of gear speeds in which clutch slip occurs is restricted.

•  Determined that vehicle may be in danger due to clutch not engaging by TCM direction according to signal from the oil pressure switch.

FAIL-SAFE FUNCTION

•  Inhibits learning control.

•  Inhibits manual mode.

•  Inhibits neutral idle control.

•  Inhibits i-stop control.

•  Inhibits AAS.

POSSIBLE CAUSE

•  ATF is less than specified value

•  On/off solenoid malfunction

•  Pressure control solenoid malfunction

•  Shift solenoid malfunction

•  Oil pressure switch circuit malfunction

•  Oil pressure switch malfunction

•  Clutch slippage

•  ATF leakage from clutch circuit

•  Control valve body malfunction

SYSTEM WIRING DIAGRAM

Not applicable

DTC P0780:00	Gear shifting malfunction
DETECTION CONDITION	• Gear ratio malfunction while in any gear 1st to 6th or clutch-slip DTC (P0729:00, P0731:00, P0732:00, P0733:00, P0734:00, P0735:00, P1728:00) occurs and vehicle is driven under gear ratio malfunction condition from fail-safe, or use of gear speeds in which clutch slip occurs is restricted. • Determined that vehicle may be in danger due to clutch not engaging by TCM direction according to signal from the oil pressure switch.
FAIL-SAFE FUNCTION	• Inhibits learning control. • Inhibits manual mode. • Inhibits neutral idle control. • Inhibits i-stop control. • Inhibits AAS.
POSSIBLE CAUSE	• ATF is less than specified value • On/off solenoid malfunction • Pressure control solenoid malfunction • Shift solenoid malfunction • Oil pressure switch circuit malfunction • Oil pressure switch malfunction • Clutch slippage • ATF leakage from clutch circuit • Control valve body malfunction
SYSTEM WIRING DIAGRAM	Not applicable

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY DTC OUTPUT STATUS • Are any the following DTCs displayed? ― P0738:00, P0746:00, P0751:00, P0752:00, P0756:00, P0757:00, P0761:00, P0762:00, P0766:00, P0767:00, P0771:00, P0772:00, P0842:00, P0843:00, P0847:00, P0848:00, P0872:00, P0873:00, P0877:00, P0878:00, P1784:00	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FW6A-EL].)
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	Go to the next step.
3	PERFORM ON-BOARD DIAGNOSTIC TEST TO SPECIFY MALFUNCTIONING PART • Perform the on-board diagnostic test. (See ON-BOARD DIAGNOSTIC TEST MODE [FW6A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FW6A-EL].)
3		No	ATF amount in Step 2 is correct: • Replace the oil pressure switch A and oil pressure switch B. (See OIL PRESSURE SWITCH REMOVAL/INSTALLATION [FW6A-EL].) ATF amount adjusted in Step 2: • Drive the vehicle to check it, and if there is no problem then the DTC troubleshooting is complete.