Automatic Transmission System (For 1Gd-Ftv) Fail-Safe Chart
Fail-safe
Automatic Transmission System (For 1Gd-Ftv) -- Fail-Safe Chart |
This function minimizes the loss of operation when any abnormality occurs in a sensor or solenoid.
Fail-safe Control ListMalfunction 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.
|
Shift Solenoid Valve Operation when NormalGear 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
|
Fail-safe Control ChartGear Position under Normal Conditions
| 1st
| 2nd
| 3rd
| 4th
| 5th
| 6th
|
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
|
- *: Fail-safe control is not actuated when an ON malfunction occurs.