AUTOMATIC TRANSMISSION SYSTEM (for 1GR-FE) FAIL-SAFE CHART
-
FAIL-SAFE
This function minimizes the loss of the ECT functions when a malfunction occurs in each sensor or solenoid.
Malfunction Part Function No. 1 ATF temperature sensor During a No. 1 ATF temperature sensor malfunction, up-shift to 5th gear and flex lock-up clutch control are prohibited. Speed sensor SP2 During an output speed sensor malfunction, shift control is performed through the input speed sensor NT signal. Shift solenoid valve S1, S2 and SR The current to the malfunctioning solenoid valve is cut off and control is performed by operating the other normal solenoid valves.
Shift control is performed depending on the malfunctioning solenoid as described in the table below.
Shift solenoid valve SL1 and SL2 During a solenoid valve SL1 or SL2 malfunction, up-shift to 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 performed 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. Shift Solenoid Valve Normal Operation Chart: Shift Lever Position Gear Shift Solenoid Valve S1 Shift Solenoid Valve S2 Shift Solenoid Valve SR Shift Solenoid Valve SL1 Shift Solenoid Valve SL2 D
S5
1st ON OFF OFF OFF ON 2nd ON ON OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON 5th OFF OFF ON ON OFF S4 1st ON OFF OFF OFF ON 2nd ON ON OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON S3 1st ON OFF OFF OFF ON 2nd ON ON OFF OFF ON 3rd E/B OFF ON OFF OFF OFF S2 1st ON OFF OFF OFF ON 2nd E/B ON ON ON OFF OFF S1 1st E/B ON OFF OFF OFF OFF -
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.
Tech Tips
-
Electrical malfunction: Condition is shown above the "↓".
-
Fail-safe mode: Condition is shown below the "↓".
-
E/B: Engine brake.
Fail-safe Operation when Shift Solenoid Valve S1 is Malfunctioning: Shift Lever Position Gear Shift Solenoid Valve S1 Shift Solenoid Valve S2 Shift Solenoid Valve SR Shift Solenoid Valve SL1 Shift Solenoid Valve SL2 D
S5
4th
↓
3rd
OFF OFF
↓
ON
OFF OFF ON 3rd OFF ON OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON 5th OFF OFF ON ON OFF S4 4th
↓
3rd
OFF OFF
↓
ON
OFF OFF ON 3rd OFF ON OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON S3 3rd
↓
3rd E/B
OFF OFF
↓
ON
OFF OFF ON
↓
OFF
3rd
↓
3rd E/B
OFF ON OFF OFF ON
↓
OFF
3rd E/B OFF ON OFF OFF OFF S2 1st OFF OFF OFF OFF ON 3rd E/B OFF ON ON OFF OFF S1 1st E/B OFF OFF OFF OFF OFF Fail-safe Operation when Shift Solenoid Valve S2 is Malfunctioning: Shift Lever Position Gear Shift Solenoid Valve S1 Shift Solenoid Valve S2 Shift Solenoid Valve SR Shift Solenoid Valve SL1 Shift Solenoid Valve SL2 D
S5
1st ON OFF OFF OFF ON 1st
↓
4th
ON
↓
OFF
OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 5th OFF OFF ON ON OFF S4 1st ON OFF OFF OFF ON 1st
↓
4th
ON
↓
OFF
OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON S3 1st ON OFF OFF OFF ON 1st
↓
3rd E/B
ON
↓
OFF
OFF OFF OFF ON
↓
OFF
3rd E/B OFF OFF OFF OFF OFF S2 1st ON OFF OFF OFF ON 2nd E/B
↓
4th
ON
↓
OFF
OFF ON OFF OFF
↓
ON
S1 1st E/B ON OFF OFF OFF OFF Fail-safe Operation when Shift Solenoid Valve SR is Malfunctioning: Shift Lever Position Gear Shift Solenoid Valve S1 Shift Solenoid Valve S2 Shift Solenoid Valve SR Shift Solenoid Valve SL1 Shift Solenoid Valve SL2 D
S5
1st ON OFF OFF OFF ON 2nd ON ON OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF ON OFF S4 1st ON OFF OFF OFF ON 2nd ON ON OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON S3 1st ON OFF OFF OFF ON 2nd ON ON OFF OFF ON 3rd E/B
↓
3rd
OFF ON OFF OFF OFF
↓
ON
S2 1st ON OFF OFF OFF ON 2nd ON ON OFF OFF OFF S1 1st E/B ON OFF OFF OFF OFF Fail-safe Operation when Shift Solenoid Valve S1 and S2 are Malfunctioning: Shift Lever Position Gear Shift Solenoid Valve S1 Shift Solenoid Valve S2 Shift Solenoid Valve SR Shift Solenoid Valve SL1 Shift Solenoid Valve SL2 D
S5
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 S4 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON S3 3rd
↓
3rd E/B
OFF OFF OFF OFF ON
↓
OFF
3rd
↓
3rd E/B
OFF OFF OFF OFF ON
↓
OFF
3rd E/B OFF OFF OFF OFF OFF S2 1st OFF OFF OFF OFF ON Fail 4th OFF OFF ON OFF OFF
↓
ON
S1 1st E/B OFF OFF OFF OFF OFF Fail-safe Operation when Shift Solenoid Valve S2 and SR are Malfunctioning: Shift Lever Position Gear Shift Solenoid Valve S1 Shift Solenoid Valve S2 Shift Solenoid Valve SR Shift Solenoid Valve SL1 Shift Solenoid Valve SL2 D
S5
1st ON 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 ON
↓
OFF
OFF
↓
ON
S4 1st ON OFF OFF OFF ON 1st
↓
4th
ON
↓
OFF
OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON S3 1st ON OFF OFF OFF ON 1st
↓
3rd
ON
↓
OFF
OFF OFF OFF ON
↓
ON
3rd E/B
↓
3rd
OFF OFF OFF OFF OFF
↓
ON
S2 1st ON OFF OFF OFF ON 1st E/B
↓
1st
ON OFF OFF OFF OFF
↓
ON
S1 1st E/B ON OFF OFF OFF OFF Fail-safe Operation when Shift Solenoid Valve S1 and SR are Malfunctioning: Shift Lever Position Gear Shift Solenoid Valve S1 Shift Solenoid Valve S2 Shift Solenoid Valve SR Shift Solenoid Valve SL1 Shift Solenoid Valve SL2 D
S5
4th
↓
3rd
OFF 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 ON
↓
OFF
OFF
↓
ON
S4 4th
↓
3rd
OFF OFF
↓
ON
OFF OFF ON 3rd OFF ON OFF OFF ON 3rd OFF ON OFF OFF ON 4th OFF OFF OFF OFF ON S3 3rd OFF OFF
↓
ON
OFF OFF ON
↓
ON
3rd OFF ON OFF OFF ON
↓
ON
3rd E/B
↓
3rd
OFF ON OFF OFF OFF
↓
ON
S2 1st OFF OFF OFF OFF ON 2nd OFF ON OFF OFF OFF S1 1st E/B OFF OFF OFF OFF OFF Fail-safe Operation when Shift Solenoid Valve S1, S2 and SR are Malfunctioning: Shift Lever Position Gear Shift Solenoid Valve S1 Shift Solenoid Valve S2 Shift Solenoid Valve SR Shift Solenoid Valve SL1 Shift Solenoid Valve SL2 D
S5
4th 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 ON
↓
OFF
OFF
↓
ON
S4 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON 4th OFF OFF OFF OFF ON S3 3rd OFF OFF OFF OFF ON
↓
ON
3rd OFF OFF OFF OFF ON
↓
ON
3rd E/B
↓
3rd
OFF OFF OFF OFF OFF
↓
ON
S2 1st OFF OFF OFF OFF ON 1st E/B
↓
1st
OFF OFF OFF OFF OFF
↓
ON
S1 1st E/B OFF OFF OFF OFF OFF -