DTC P0731:00 [CW6A-EL]

id050233817800

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 i-stop 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

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 i-stop 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

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, 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 [CW6A-EL].)
1		No	Go to the next step.
2	INSPECT ATF LEVEL • Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [CW6A-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 [CW6A-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 [CW6A-EL].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [CW6A-EL].)
3		No	ATF amount in Step 2 is correct: • Replace the automatic transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [CW6A-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.