FAIL-SAFE CHART
1. FAIL-SAFE
This function minimizes the loss of ECT functions when a malfunction occurs in a 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 using 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 failed 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 using 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 Lever Position |
Gear |
Shift Solenoid S1 |
Shift Solenoid S2 |
Shift Solenoid SR |
Shift Solenoid SL1 |
Shift Solenoid 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 |
2. FAIL-SAFE FUNCTION
If any of the shift solenoid valve circuits has an open or short failure, the ECM turns the other shift solenoids 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 when starting the engine again in the fail-safe mode, the gear position remains in the same position.
HINT:
Shift Lever Position |
Gear |
Shift Solenoid S1 |
Shift Solenoid S2 |
Shift Solenoid SR |
Shift Solenoid SL1 |
Shift Solenoid 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 |
Shift Lever Position |
Gear |
Shift Solenoid S1 |
Shift Solenoid S2 |
Shift Solenoid SR |
Shift Solenoid SL1 |
Shift Solenoid 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 |
Shift Lever Position |
Gear |
Shift Solenoid S1 |
Shift Solenoid S2 |
Shift Solenoid SR |
Shift Solenoid SL1 |
Shift Solenoid 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 |
Shift Lever Position |
Gear |
Shift Solenoid S1 |
Shift Solenoid S2 |
Shift Solenoid SR |
Shift Solenoid SL1 |
Shift Solenoid 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 |
Shift Lever Position |
Gear |
Shift Solenoid S1 |
Shift Solenoid S2 |
Shift Solenoid SR |
Shift Solenoid SL1 |
Shift Solenoid 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 |
Shift Lever Position |
Gear |
Shift Solenoid S1 |
Shift Solenoid S2 |
Shift Solenoid SR |
Shift Solenoid SL1 |
Shift Solenoid 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 |
Shift Lever Position |
Gear |
Shift Solenoid S1 |
Shift Solenoid S2 |
Shift Solenoid SR |
Shift Solenoid SL1 |
Shift Solenoid 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 |
Accessories, spare parts and modification of your Toyota
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Side Auto Step ECU Power Source Circuit
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following
inspection procedure.
PROCEDURE
1.
CHECK HARNESS AND CONNECTOR (SIDE AUTO STEP CONTROLLER ECU - ...