Automatic Transmission System Fail-Safe Chart

  1. FAIL-SAFE CHART

Automatic Transmission System -- Fail-Safe Chart



FAIL-SAFE CHART
This function minimizes the loss of the ECT functions when a malfunction occurs in each sensor or solenoid.
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 an open or short circuit, the ECM stops sending the current to the open or short circuited solenoid.
Even if starting the engine again in the fail-safe mode, the gear position remains in the same position.

Malfunctioning 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:
Speed Sensor (SP2)
During an output speed sensor malfunction, shift control is performed using the speed sensor (NT) signal.
DTC 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 and P0778:
Shift Solenoid Valve SL1 and SL2
During a solenoid valve SL1 or SL2 malfunction, up-shift to 5th gear is prohibited.
DTC 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 P2759:
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.

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
HINT:
  1. Electrical malfunction: Condition is shown to the left of the "→".
  2. Fail-safe mode: Condition is shown to the right of the "→".
  3. E/B: Engine brake.