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DI-985
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
DIDV5-01
FAIL-SAFE CHART
1. FAIL-SAFE
This function minimizes the loss of the ECT functions when any malfunction occurs in a sensor or solenoid.
Malfunction Part Function
During an output speed sensor malfunction, shift control is effected through the
Output Speed Sensor (SP2)
input speed sensor signal (NT).
During an ATF temperature sensor No. 1 malfunction, up-shift to the 5th and flex
ATF Temp. Sensor No. 1
lock-up clutch control are prohibited.
The current to the failed solenoid valve is cut off and control is effected by operating
the other solenoid valves with normal operation.
Shift Solenoid Valve S1, S2 and SR
Shift control is effected depending on the failed solenoid as described in the table
on the next page.
Shift Solenoid Valve SL1 and SL2 During a solenoid valve SL1 or SL2 malfunction, up-shift to the 5th is prohibited.
During a solenoid valve SLU malfunction, the current to the solenoid valve is
Shift Solenoid Valve SLU stopped. This stops lock-up control and flex lock-up control, fuel economy de-
creases.
During a solenoid valve SLT malfunction, the current to the solenoid valve is
Shift Solenoid Valve SLT stopped. This stops line pressure optimal control, the shift shock increases. How-
ever, shifting is effected through normal clutch pressure control.
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 circuited solenoid.
Even if starting the engine again in the fail-safe mode, the gear position remains in the same position.
DI-986
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
f: ON
X: OFF
: Condition in the electrical malfunction is shown on the left of "".
Condition in the fail-safe mode is shown on the right of "".
E/B: Engine brake.
NORMAL S1 OFF S2 OFF SR OFF
Position
Gear S1 S2 SR SL1 SL2 Gear S1 S2 SR SL1 SL2 Gear S1 S2 SR SL1 SL2 Gear S1 S2 SR SL1 SL2
"R" R R R R
4 th
1 st 1 st 1 st
"D"
3 rd
1 st
2 nd 3 rd 2 nd
4 th
3 rd 3 rd 4 th 3 rd
4 th 4 th 4 th 4 th
5 th 5 th 5 th 4 th
3 rd
"3" 1 st 1 st 1 st
3 rd E/B
3 rd 1 st
2 nd 2 nd
3 rd E/B 3 rd E/B
3 rd E/B
3 rd E/B 3 rd E/B 3 rd E/B
3 rd
4 th
4 th 4 th 3 rd
3 rd E/B
5 th 5 th 5 th
3 rd
"2" 1 st 1 st 1 st 1 st
2 nd E/B
2 nd
2 nd E/B 3 rd E/B
4 th
3 rd E/B 3 rd E/B Fail 4th 2 nd
1 st
4 th 4 th 4 th
2 nd
1 st E/B
5 th 5 th 5 th
2 nd
"L" 1 st E/B 1 st E/B 1 st E/B 1 st E/B
2 nd E/B
2 nd E/B 3 rd E/B 2 nd
4 th
3 rd E/B 3 rd E/B Fail 4 th 2 nd
1 st
4 th 4 th 4 th
2 nd
1 st E/B
5 th 5 th 5 th
2 nd
DI-987
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
f: ON
X: OFF
: Condition in the electrical malfunction is shown on the left of "".
Condition in the fail-safe mode is shown on the right of "".
E/B: Engine brake.
S1 S2 OFF S2 SR OFF S1 SR OFF S1 S2 SR OFF
Position
Gear S1 S2 SR SL1 SL2 Gear S1 S2 SR SL1 SL2 Gear S1 S2 SR SL1 SL2 Gear S1 S2 SR SL1 SL2
"R" R R R R
4 th
4 th 1 st 4 th
"D"
3 rd
1 st
4 th 3 rd 4 th
4 th
4 th 4 th 3 rd 4 th
4 th 4 th 4 th 4 th
5 th 4 th 4 th 4 th
3 rd
1 st 3 rd
"3"
3 rd
3 rd E/B
3 rd 1 st
3 rd 3 rd
3 rd E/B 3 rd
3 rd E/B 3 rd E/B 3 rd E/B
3 rd E/B
3 rd 3 rd 3 rd
4 th 3 rd 3 rd 3 rd
1 st E/B 3 rd E/B 3 rd E/B
5 th
3 rd 3 rd 3 rd
"2" 1 st 1 st 1 st 1 st
1 st E/B 1 st E/B
2 nd
Fail 4 th
1 st 1 st
1 st E/B 1 st E/B
2 nd
Fail 4 th
1 st 1 st
1 st
4 th 1 st 1 st
2nd
1 st E/B 1 st E/B 1 st E/B
5 th 1 st
1 st 2nd
"L" 1 st E/B 1 st E/B 1 st E/B 1 st E/B
1 st E/B 1 st E/B
2 nd
Fail 4 th
1 st 1 st
1 st E/B 1 st E/B
Fail 4 th 2 nd
1 st 1 st
1 st
4 th 1 st 1 st
2nd
1 st E/B 1 st E/B 1 st E/B
5 th
1 st 2nd 1 st
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