DTC P0731-00; 1GR Incorrect Ratio

DTC P0731-00; 1GR incorrect ratio - DETECTION CONDITION & POSSIBLE CAUSE

DTC P0731:00	1GR incorrect ratio
DETECTION CONDITION	In D position, 1GR, the following phenomenon occurs: Speed ratio is 0.75 to 1.2 for 2, 000 ms while vehicle is stopped in D position. There is difference between turbine/input shaft speed and output shaft speed sensor speed for 230 to 1, 980 ms (varies with ATF temperature and ECT) during shift-up. There is difference between turbine/input shaft speed and output shaft speed sensor speed for 1, 500 to 3, 900 ms (varies with ATF temperature) while driving without shifting.
FAIL-SAFE FUNCTION	Inhibits malfunctioning gear. Limits engine torque. Inhibits learning control. Inhibits manual mode. Inhibits neutral idle control. Inhibits AAS.
POSSIBLE CAUSE	ATF is less than specified value Clutch burnt Shift solenoid malfunction ATF leakage from clutch circuit Control valve body malfunction
SYSTEM WIRING DIAGRAM	Not applicable Diagnostic procedure

DTC P0731-00; 1GR incorrect ratio - DETECTION CONDITION & POSSIBLE CAUSE

STEP	INSPECTION		ACTION
1	VERIFY DTC OUTPUT STATUS Are any the following DTCs displayed? P0746:00, P0751:00, P0752:00, P0756:00, P0757:00, P0761:00, P0762:00, P0766:00, P0767:00, P0771:00, P0772:00, P079A: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 [TCM (EW6A-EL/EW6AX-EL)] .)
1		No	Go to the next step.
2	INSPECT ATF LEVEL Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [EW6A-EL/EW6AX-EL] .) Is there any malfunction?	Yes	Adjust the ATF level to the specification, then go to the next step. (See AUTOMATIC TRANSAXLE FLUID (ATF) ADJUSTMENT [EW6A-EL/EW6AX-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 [TCM (EW6A-EL/EW6AX-EL)] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (EW6A-EL/EW6AX-EL)] .)
3		No	ATF amount in Step 2 is correct: Replace the automatic transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [EW6A-EL].) (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [EW6AX-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.