ELECTRONIC CONTROLLED AUTOMATIC TRANSMISSION SYSTEM (for 1GR-FE) FAIL-SAFE CHART


  1. FAIL-SAFE CHART

    This function minimizes the loss of the ECT functions when a malfunction occurs in each sensor or solenoid.

    Malfunction Part Function

    DTC P0710, P0712 and P0713:

    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.

    DTC P0722:

    Output Speed Sensor (SP2)

    		 During an output speed sensor malfunction, shift control is performed using the input speed sensor signal (NT).

    DTC P0751, P0756, P0771, P0973, P0974, P0976, P0977, P0985 and P0986:

    Shift Solenoid Valve S1, S2 and SR

    The current to the failed solenoid valve is cut off and control is performed by operating the other normal solenoid valves.

    Shift control is performed depending on the failed solenoid as described in the table below.

    DTC P0748, P0776 and P0778:

    Shift Solenoid Valve SL1 and SL2

    		 During a solenoid valve SL1 or SL2 malfunction, up-shift to the 5th gear is prohibited.

    DTC P02714 and P2716:

    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 using normal clutch pressure control.

    DTC P2757:

    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.

    Position 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
    Position 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
    Position S1 S2 OFF S2 SR OFF
    Gear S1 S2 SR SL1 SL2 Gear S1 S2 SR SL1 SL2
    "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
    Position 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

    Tech Tips


    • Electrical malfunction: Condition is shown to the left of the "→".

    • Fail-safe mode: Condition is shown to the right of the "→".

    • E/B: Engine brake.