Automatic Transaxle System Fail-Safe Chart

Transmission. Camry. Acv40 Gsv40
U250E Automatic Transaxle. Camry. Acv40 Gsv40
  1. FAIL-SAFE

Automatic Transaxle System -- Fail-Safe Chart



FAIL-SAFE
This function minimizes the loss of the ECT functions when any malfunction occurs in a sensor or solenoid.
  1. ATF (Automatic Transmission Fluid) temperature sensor:
    When the ATF temperature sensor has a malfunction, 5th upshift is prohibited.

  2. Counter gear speed sensor NC (Speed sensor NC):
    When the counter gear speed sensor has a malfunction, 5th upshift is prohibited.

  3. Shift solenoid valve DSL:
    When the solenoid valve DSL has a malfunction, the current to the solenoid valve is stopped.
    This stops lock-up control, then fuel economy decreases.

  4. Shift solenoid valve SL1, SL2, SL3 and S4:
    Fail safe function:
    If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid "ON" and "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 circuited solenoid).
    Even if starting the engine in the fail-safe mode, the gear position remains in the same position.

    HINT:
    FL: Flex Lock-up

    Normal
    Solenoid Valve
    SL1
    ON
    OFF
    ON
    OFF
    OFF
    SL2
    ON
    ON
    OFF
    FL
    FL
    SL3
    OFF
    OFF
    OFF
    ON
    ON
    S4
    OFF
    OFF
    OFF
    OFF
    ON
    Gear Position
    1st
    2nd
    3rd
    4th
    5th
    SL1 Malfunction
    (During driving at 1st or 2nd)
    Solenoid Valve
    SL1
    OFF
    SL2
    ON
    ON
    OFF to ON
    FL to ON
    FL to ON
    SL3
    OFF
    OFF
    OFF
    ON to OFF
    ON to OFF
    S4
    OFF
    OFF
    OFF
    OFF
    ON to OFF
    Gear Position
    1st to 2nd
    2nd
    3rd to 2nd
    4th to 2nd
    5th to 2nd
    SL1 Malfunction
    (During driving at 3rd)
    Solenoid Valve
    SL1
    OFF
    SL2
    ON to FL
    ON to FL
    OFF to FL
    FL
    FL
    SL3
    OFF
    OFF
    OFF
    ON to FL
    ON to FL
    S4
    OFF to ON
    OFF to ON
    OFF to ON
    OFF to ON
    ON
    Gear Position
    1st to 4th
    2nd to 4th
    3rd to 4th
    4th
    5th to 4th
    SL1 Malfunction
    (During driving at 4th or 5th)
    Solenoid Valve
    SL1
    OFF
    SL2
    ON to FL
    ON to FL
    OFF to FL
    FL
    FL
    SL3
    OFF to ON
    OFF to ON
    OFF to ON
    ON
    ON
    S4
    OFF
    OFF
    OFF
    OFF
    ON
    Gear Position
    1st to 4th
    2nd to 4th
    3rd to 4th
    4th
    5th to 4th
    SL2 Malfunction
    Solenoid Valve
    SL1
    ON
    OFF to ON
    ON
    OFF to ON
    OFF to ON
    SL2
    OFF
    SL3
    OFF
    OFF
    OFF
    ON to OFF
    ON to OFF
    S4
    OFF to ON
    OFF to ON
    OFF to ON
    OFF to ON
    ON
    Gear Position
    1st to 4th
    2nd to 4th
    3rd to 4th
    4th
    5th to 4th
    SL3 Malfunction
    Solenoid Valve
    SL1
    ON
    OFF
    ON
    OFF to ON
    OFF to ON
    SL2
    ON
    ON
    OFF
    FL
    FL
    SL3
    OFF
    S4
    OFF
    OFF
    OFF
    OFF to ON
    ON
    Gear Position
    1st
    2nd
    3rd
    4th
    5th to 4th
    S4 Malfunction
    Solenoid Valve
    SL1
    ON
    OFF
    ON
    OFF
    OFF
    SL2
    ON
    ON
    OFF
    FL
    FL
    SL3
    OFF
    OFF
    OFF
    ON
    ON
    S4
    OFF
    Gear Position
    1st
    2nd
    3rd
    4th
    5th to 4th
    SL1, SL2, SL3, and S4 Malfunction
    Solenoid Valve
    SL1
    OFF
    SL2
    OFF
    SL3
    OFF
    S4
    OFF
    Gear Position
    1st to 4th
    2nd to 4th
    3rd to 4th
    4th
    5th to 4th