Automatic Transaxle System (For Sedan) Fail-Safe Chart
FAIL-SAFE
Automatic Transaxle System (For Sedan) -- Fail-Safe Chart |
This function minimizes the loss of ECT functions when any malfunction occurs in the sensors or solenoids.
Malfunction Part
| Function
|
Vehicle Speed Sensor
| During vehicle speed sensor signal malfunction, 4th up-shift is prohibited.
|
Transmission Revolution Sensor (Speed Sensor (NT))
| During transmission revolution sensor (NT) signal malfunction, 4th up-shift is prohibited.
|
ATF (Automatic Transmission Fluid) Temperature Sensor
| During ATF temperature sensor malfunction, 4th up-shift is prohibited.
|
Shift Solenoid Valve S1 or S2
| During shift solenoid valve S1 or S2 malfunction, current to faulty shift solenoid valve is cut off and control is effected by operating normal solenoid valve.
Shift control effect depends on failed solenoid as described in table below.
|
Shift Solenoid Valve ST
| During shift solenoid valve ST malfunction, 4th up-shift is prohibited.
|
Shift Solenoid Valve SLT
| During shift solenoid valve SLT malfunction, 4th up-shift is prohibited.
|
Engine Coolant Temperature Sensor, Knock Sensor or Throttle Position Sensor
| During engine coolant temperature sensor, knock sensor or throttle position sensor malfunction, 4th up-shift is prohibited.
|
Fail-safe chart for shift solenoid valve S1 and/or S2:
Fail safe function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid ON or OFF in order to shift into the gear positions shown in the table below.
Manual shifting as shown in the following table must be done (In case of a short circuit, the ECM stops sending the current to the short circuit solenoid).
Even if starting the engine in fail-safe mode, the gear position remains in the same position.
Normal:Shift Lever Position
| Shift Solenoid Valve S1
| Shift Solenoid Valve S2
| Gear
|
D
| 1st
| ON
| ON
| 1st
|
2nd
| ON
| OFF
| 2nd
|
3rd
| OFF
| OFF
| 3rd
|
4th
| OFF
| ON
| 4th
|
3
| 1st
| ON
| ON
| 1st
|
2nd
| ON
| OFF
| 2nd
|
3rd
| OFF
| OFF
| 3rd
|
2
| 1st
| ON
| ON
| 1st
|
2nd
| ON
| OFF
| 2nd
|
L
| 1st
| ON
| ON
| 1st
|
Shift Solenoid Valve S1 malfunction:Shift Lever Position
| Shift Solenoid Valve S1
| Shift Solenoid Valve S2
| Gear
|
D
| 1st
| X
| OFF
| 3rd
|
2nd
| X
| OFF
| 3rd
|
3rd
| X
| OFF
| 3rd
|
4th
| X
| ON
| 4th
|
3
| 1st
| X
| OFF
| 3rd
|
2nd
| X
| OFF
| 3rd
|
3rd
| X
| OFF
| 3rd
|
2
| 1st
| X
| OFF
| 3rd
|
2nd
| X
| OFF
| 3rd
|
L
| 1st
| X
| OFF
| 3rd
|
X: Malfunctions
Shift Solenoid Valve S2 malfunction:Shift Lever Position
| Shift Solenoid Valve S1
| Shift Solenoid Valve S2
| Gear
|
D
| 1st
| ON
| X
| 2nd
|
2nd
| ON
| X
| 2nd
|
3rd
| OFF
| X
| 3rd
|
4th
| OFF
| X
| 3rd
|
3
| 1st
| ON
| X
| 2nd
|
2nd
| ON
| X
| 2nd
|
3rd
| OFF
| X
| 3rd
|
2
| 1st
| ON
| X
| 2nd
|
2nd
| ON
| X
| 2nd
|
L
| 1st
| ON
| X
| 2nd
|
X: Malfunctions
Shift Solenoid Valve S1 and S2 malfunction:Shift Lever Position
| Shift Solenoid Valve S1
| Shift Solenoid Valve S2
| Gear
|
D
| 1st
| X
| X
| 3rd
|
2nd
| X
| X
| 3rd
|
3rd
| X
| X
| 3rd
|
4th
| X
| X
| 3rd
|
3
| 1st
| X
| X
| 3rd
|
2nd
| X
| X
| 3rd
|
3rd
| X
| X
| 3rd
|
2
| 1st
| X
| X
| 3rd
|
2nd
| X
| X
| 3rd
|
L
| 1st
| X
| X
| 3rd
|
X: Malfunctions