Fail-safe
This function minimizes the loss of operation when any abnormality occurs in a sensor or solenoid.
| Malfunction Part | Function |
|---|---|
| Transmission revolution sensor (NT) | During a transmission revolution sensor (NT) malfunction, shift control is performed based on the transmission revolution sensor (SP2) signal. |
| Transmission revolution sensor (SP2) | During a transmission revolution sensor (SP2) malfunction, shift control is performed based on the wheel speed sensor signal. |
| ATF temperature sensors (No. 1 and No. 2) | During an ATF temperature sensor malfunction, up-shifting to 5th and 6th is prohibited. |
| Shift solenoid valve SL1, SL2, SL3 and SL4 | Stop the conduction of electric power to a failed solenoid and shift gears by turning on/off normal solenoids. If all solenoids are malfunctioning, gears will be selected through mechanical hydraulic circuits. |
| Shift solenoid valve SLT | During a shift solenoid valve SLT malfunction, the current to the shift solenoid valve is stopped.
However, shifting is performed through normal clutch pressure control. |
| Shift solenoid valve SLU | During a shift solenoid valve SLU malfunction, the current to the shift solenoid valve is stopped.
This stops lock-up control, thus decreasing fuel economy. |
| Gear Position | 1st | 2nd | 3rd | 4th | 5th | 6th |
|---|---|---|---|---|---|---|
| Shift solenoid valve SL1 | ON | ON | ON | ON | OFF | OFF |
| Shift solenoid valve SL2 | OFF | OFF | OFF | ON | ON | ON |
| Shift solenoid valve SL3 | OFF | ON | OFF | OFF | OFF | ON |
| Shift solenoid valve SL4 | OFF | OFF | ON | OFF | ON | OFF |
| Gear Position under Normal Conditions | 1st | 2nd | 3rd | 4th | 5th | 6th | |
|---|---|---|---|---|---|---|---|
|
*: Fail-safe control is not actuated when an ON malfunction occurs. |
|||||||
| Shift solenoid valve SL1 | ON Malfunction (without Fail-safe Control)* | 1st | 2nd | 3rd | 4th | 4th | 4th |
| OFF Malfunction (without Fail-safe Control) | 1st to N | 2nd to N | 3rd to N | 4th to N | 5th | 6th | |
| Fail-safe Control during OFF Malfunction | Fixed in 3rd or 5th | ||||||
| Shift solenoid valve SL2 | ON Malfunction (without Fail-safe Control)* | 1st to 4th | 2nd to 4th | 3rd to 4th | 4th | 5th | 6th |
| OFF Malfunction (without Fail-safe Control) | 1st | 2nd | 3rd | 4th to 1st | 5th to N | 6th to N | |
| Fail-safe Control during OFF Malfunction | Fixed in 2nd or 3rd | ||||||
| Shift solenoid valve SL3 | ON Malfunction (without Fail-safe Control)* | 1st to 2nd | 2nd | 3rd | 4th | 5th | 6th |
| OFF Malfunction (without Fail-safe Control) | 1st | 2nd to 1st | 3rd | 4th | 5th | 6th to N | |
| Fail-safe Control during OFF Malfunction | Fixed in 3rd | ||||||
| Shift solenoid valve SL4 | ON Malfunction (without Fail-safe Control)* | 3rd | 3rd | 3rd | 4th | 5th | 5th |
| OFF Malfunction (without Fail-safe Control) | 1st | 2nd | 3rd to 1st | 4th | 5th to N | 6th | |
| Fail-safe Control during OFF Malfunction | Fixed in 2nd | ||||||