Automatic Transmission System: Fail-Safe
- FAIL-SAFE TABLE
This function minimizes the loss of the ECT functions when a malfunction occurs in each sensor or solenoid.
FAIL-SAFE TABLEMalfunction Part Function No. 1 ATF Temperature Sensor During a No. 1 ATF temperature sensor malfunction, up-shift to the 5th gear and flex lock-up clutch control are prohibited. Output Speed Sensor (SP2) During an output speed sensor malfunction, shift control is effected through the input speed sensor signal (NT). Shift Solenoid Valve S1, S2 and SR The current to the failed solenoid valve is cut off and control is effected by operating the other solenoid valves with normal operation. Shift control is effected depending on the failed solenoid as described in the table below. Shift Solenoid Valve SL1 and SL2 During a solenoid valve SL1 or SL2 malfunction, up-shift to the 5th gear is prohibited. Shift Solenoid Valve SLT During a solenoid valve SLT malfunction, the current to the solenoid valve is stopped. This stops line pressure optimal control, and shift shock increases. However, shifting is effected through normal clutch pressure control. Shift Solenoid Valve SLU During a solenoid valve SLU malfunction, the current to the solenoid valve is stopped. This stops lock-up control and flex lock-up control, and fuel economy decreases. Fail-safe function:
If either of the shift solenoid valve circuits has an open or short failure, the ECM turns the other shift solenoid ON and OFF in order to shift into the gear positions shown in the table below.
In case of a short circuit, the ECM stops sending current to the short circuit solenoid.
Even if starting the engine again in the fail-safe mode, the gear position remains in the same position.
HINT:
- ↓: Condition in the electrical malfunction is shown above "↓".
- ↓: Condition in fail-safe mode is shown below "↓".
- E/B: Engine brake.
FAIL-SAFE TABLEPosition NORMAL S1 OFF Gear S1 S2 SR SL1 SL2 Gear S1 S2 SR SL1 SL2 R R ON OFF OFF OFF ON R OFF OFF OFF OFF ON D 1st ON OFF OFF OFF ON 4th ↓ 3rd OFF OFF ↓ ON OFF OFF ON 2nd ON ON OFF OFF ON 3rd OFF ON OFF OFF ON 3rd OFF ON OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 5th OFF OFF ON ON OFF 5th OFF OFF ON ON OFF 3 1st ON OFF OFF OFF ON 3rd ↓ 3rd E/B OFF OFF ↓ ON OFF OFF ON ↓ OFF 2nd ON ON OFF OFF ON 3rd ↓ 3rd E/B OFF ON OFF OFF ON ↓ OFF 3rd E/B OFF ON OFF OFF OFF 3rd E/B OFF ON OFF OFF OFF 4th OFF OFF ON OFF ON 4th OFF OFF ON OFF ON 5th OFF OFF ON ON OFF 5th OFF OFF ON ON OFF 2 1st ON OFF OFF OFF ON 1st OFF OFF OFF OFF ON 2nd E/B ON ON ON OFF OFF 3rd E/B OFF ON ON OFF OFF 3rd E/B OFF ON ON OFF OFF 3rd E/B OFF ON ON OFF OFF 4th OFF OFF ON OFF ON 4th OFF OFF ON OFF ON 5th OFF OFF ON ON OFF 5th OFF OFF ON ON OFF L 1st E/B ON OFF OFF OFF OFF 1st E/B OFF OFF OFF OFF OFF 2nd E/B ON ON ON OFF OFF 3rd E/B OFF ON ON OFF OFF 3rd E/B OFF ON ON OFF OFF 3rd E/B OFF ON ON OFF OFF 4th OFF OFF ON OFF ON 4th OFF OFF ON OFF ON 5th OFF OFF ON ON OFF 5th OFF OFF ON ON OFF FAIL-SAFE TABLEPosition S2 OFF SR OFF Gear S1 S2 SR SL1 SL2 Gear S1 S2 SR SL1 SL2 R R ON OFF OFF OFF ON R ON OFF OFF OFF ON D 1st ON OFF OFF OFF ON 1st ON OFF OFF OFF ON 1st ↓ 4th ON ↓ OFF OFF OFF OFF ON 2nd ON ON OFF OFF ON 4th OFF OFF OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 5th OFF OFF ON ON OFF 4th OFF OFF OFF ON OFF 3 1st ON OFF OFF OFF ON 1st ON OFF OFF OFF ON 1st ↓ 3rd E/B ON ↓ OFF OFF OFF OFF ON ↓ OFF 2nd ON ON OFF OFF ON 3rd E/B OFF OFF OFF OFF OFF 3rd E/B ↓ 3rd OFF ON OFF OFF OFF ↓ ON 4th OFF OFF ON OFF ON 3rd OFF OFF ↓ ON OFF OFF ON ↓ ON 5th OFF OFF ON ON OFF 3rd E/B ↓ 3rd OFF OFF ↓ ON OFF ON ↓ OFF OFF ↓ ON 2 1st ON OFF OFF OFF ON 1st ON OFF OFF OFF ON 2nd E/B ↓ 4th ON ↓ OFF OFF ON OFF OFF ↓ ON 2nd ON ON OFF OFF OFF Fail 4th OFF OFF ON OFF OFF ↓ ON 2nd OFF ↓ ON ON OFF OFF OFF 4th OFF OFF ON OFF ON 1st ↓ 2nd OFF ↓ ON OFF ↓ ON OFF OFF ON ↓ OFF 5th OFF OFF ON ON OFF 1st E/B ↓ 2nd OFF ↓ ON ON OFF ON ↓ OFF OFF L 1st E/B ON OFF OFF OFF OFF 1st E/B ON OFF OFF OFF OFF 2nd E/B ↓ 4th ON ↓ OFF OFF ON OFF OFF ↓ ON 2nd ON ON OFF OFF OFF Fail 4th OFF OFF ON OFF OFF ↓ ON 2nd OFF ↓ ON ON OFF OFF OFF 4th OFF OFF ON OFF ON 1st ↓ 2nd OFF ↓ ON OFF ↓ ON OFF OFF ON ↓ OFF 5th OFF OFF ON ON OFF 1st E/B ↓ 2nd OFF ↓ ON OFF ↓ ON OFF ON ↓ OFF OFF R R OFF OFF OFF OFF ON R ON OFF OFF OFF ON D 4th OFF OFF OFF OFF ON 1st ON OFF OFF OFF ON 4th OFF OFF OFF OFF ON 1st ↓ 4th ON ↓ OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 5th OFF OFF ON ON OFF 4th OFF OFF OFF ON ↓ OFF OFF ↓ ON 3 3rd ↓ 3rd E/B OFF OFF OFF OFF ON ↓ OFF 1st ON OFF OFF OFF ON 3rd ↓ 3rd E/B OFF OFF OFF OFF ON ↓ OFF 1st E/B ↓ 3rd ON ↓ OFF OFF OFF OFF ON ↓ ON 3rd E/B OFF OFF OFF OFF OFF 3rd E/B ↓ 3rd OFF OFF OFF OFF OFF ↓ ON 4th OFF OFF ON OFF ON 3rd OFF OFF OFF OFF ON ↓ ON 5th OFF OFF ON ON OFF 1st E/B ↓ 3rd OFF OFF OFF ON ↓ OFF OFF ↓ ON 2 1st OFF OFF OFF OFF ON 1st ON OFF OFF OFF ON Fail 4th OFF OFF ON OFF OFF ↓ ON 1st E/B ↓ 1st ON OFF OFF OFF OFF ↓ ON Fail 4th OFF OFF ON OFF OFF ↓ ON 1st E/B ↓ 1st OFF ↓ ON OFF OFF OFF OFF ↓ ON 4th OFF OFF ON OFF ON 1st OFF ↓ ON OFF OFF OFF ON 5th OFF OFF ON ON OFF 1st E/B ↓ 1st OFF ↓ ON OFF OFF ON ↓ OFF OFF ↓ ON L 1st E/B OFF OFF OFF OFF OFF 1st E/B ON OFF OFF OFF OFF Fail 4th OFF OFF ON OFF OFF ↓ ON 1st E/B ↓ 1st ON OFF OFF OFF OFF ↓ ON Fail 4th OFF OFF ON OFF OFF ↓ ON 1st E/B ↓ 1st OFF ↓ ON OFF OFF OFF OFF ↓ ON 4th OFF OFF ON OFF ON 1st OFF ↓ ON OFF OFF OFF ON 5th OFF OFF ON ON OFF 1st E/B ↓ 1st OFF ↓ ON OFF OFF ON ↓ OFF OFF ↓ ON FAIL-SAFE TABLEPosition S1 SR OFF S1 S2 SR OFF Gear S1 S2 SR SL1 SL2 Gear S1 S2 SR SL1 SL2 R R OFF OFF OFF OFF ON R OFF OFF OFF OFF ON D 4th ↓ 3rd OFF OFF ↓ ON OFF OFF ON 4th OFF OFF OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF ON ↓ OFF OFF ↓ ON 4th OFF OFF OFF ON ↓ OFF OFF ↓ ON 3 3rd OFF OFF ↓ ON OFF OFF ON ↓ ON 3rd OFF OFF OFF OFF ON ↓ ON 3rd OFF ON OFF OFF ON ↓ ON 3rd OFF OFF OFF OFF ON ↓ ON 3rd E/B ↓ 3rd OFF ON OFF OFF OFF ↓ ON 3rd E/B ↓ 3rd OFF OFF OFF OFF OFF ↓ ON 3rd OFF OFF ↓ ON OFF OFF ON ↓ ON 3rd OFF OFF OFF OFF ON ↓ ON 3rd E/B ↓ 3rd OFF OFF ↓ ON OFF ON ↓ OFF OFF ↓ ON 3rd E/B ↓ 3rd OFF OFF OFF ON ↓ OFF OFF ↓ ON 2 1st OFF OFF OFF OFF ON 1st OFF OFF OFF OFF ON 2nd OFF ON OFF OFF OFF 1st E/B ↓ 1st OFF OFF OFF OFF OFF ↓ ON 2nd OFF ON OFF OFF OFF 1st E/B ↓ 1st OFF OFF OFF OFF OFF ↓ ON 1st ↓ 2nd OFF OFF ↓ ON OFF OFF ON ↓ OFF 1st OFF OFF OFF OFF ON 1st E/B ↓ 2nd OFF OFF ↓ ON OFF ON ↓ OFF OFF 1st E/B ↓ 1st OFF OFF OFF ON ↓ OFF OFF ↓ ON L 1st E/B OFF OFF OFF OFF OFF 1st E/B OFF OFF OFF OFF OFF 2nd OFF ON OFF OFF OFF 1st E/B ↓ 1st OFF OFF OFF OFF OFF ↓ ON 2nd OFF ON OFF OFF OFF 1st E/B ↓ 1st OFF OFF OFF OFF OFF ↓ ON 1st ↓ 2nd OFF OFF ↓ ON OFF OFF ON ↓ OFF 1st OFF OFF OFF OFF ON 1st E/B ↓ 2nd OFF OFF ↓ ON OFF ON ↓ OFF OFF 1st E/B ↓ 1st OFF OFF OFF ON ↓ OFF OFF ↓ ON