Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - A750F AUTOMATIC TRANSMISSION / TRANSAXLE


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

FAIL-SAFE

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

Malfunction PartFunction
No. 1 ATF temperature sensorDuring a No. 1 ATF temperature sensor malfunction, up-shift to 5th gear and flex lock-up clutch control are prohibited.
Speed sensor SP2During an output speed sensor malfunction, shift control is performed through the input speed sensor NT signal.
Shift solenoid valve S1, S2 and SRThe 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 malfunctioning solenoid as described in the table below.
Shift solenoid valve SL1 and SL2During a solenoid valve SL1 or SL2 malfunction, up-shift to 5th gear is prohibited.
Shift solenoid valve SLTDuring 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 through normal clutch pressure control.
Shift solenoid valve SLUDuring 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 Solenoid Valve Normal Operation Chart:
Shift Lever PositionGearShift Solenoid Valve S1Shift Solenoid Valve S2Shift Solenoid Valve SRShift Solenoid Valve SL1Shift Solenoid Valve SL2
D
S5		1stONOFFOFFOFFON
2ndONONOFFOFFON
3rdOFFONOFFOFFON
4thOFFOFFOFFOFFON
5thOFFOFFONONOFF
S41stONOFFOFFOFFON
2ndONONOFFOFFON
3rdOFFONOFFOFFON
4thOFFOFFOFFOFFON
S31stONOFFOFFOFFON
2ndONONOFFOFFON
3rd E/BOFFONOFFOFFOFF
S21stONOFFOFFOFFON
2nd E/BONONONOFFOFF
S11st E/BONOFFOFFOFFOFF
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.

  • HINT:
Electrical malfunction: Condition is shown above the "↓".
Fail-safe mode: Condition is shown below the "↓".
E/B: Engine brake.
Fail-safe Operation when Shift Solenoid Valve S1 is Malfunctioning:
Shift Lever PositionGearShift Solenoid Valve S1Shift Solenoid Valve S2Shift Solenoid Valve SRShift Solenoid Valve SL1Shift Solenoid Valve SL2
D
S5		4th
↓
3rd		OFFOFF
↓
ON		OFFOFFON
3rdOFFONOFFOFFON
3rdOFFONOFFOFFON
4thOFFOFFOFFOFFON
5thOFFOFFONONOFF
S44th
↓
3rd		OFFOFF
↓
ON		OFFOFFON
3rdOFFONOFFOFFON
3rdOFFONOFFOFFON
4thOFFOFFOFFOFFON
S33rd
↓
3rd E/B		OFFOFF
↓
ON		OFFOFFON
↓
OFF
3rd
↓
3rd E/B		OFFONOFFOFFON
↓
OFF
3rd E/BOFFONOFFOFFOFF
S21stOFFOFFOFFOFFON
3rd E/BOFFONONOFFOFF
S11st E/BOFFOFFOFFOFFOFF
Fail-safe Operation when Shift Solenoid Valve S2 is Malfunctioning:
Shift Lever PositionGearShift Solenoid Valve S1Shift Solenoid Valve S2Shift Solenoid Valve SRShift Solenoid Valve SL1Shift Solenoid Valve SL2
D
S5		1stONOFFOFFOFFON
1st
↓
4th		ON
↓
OFF		OFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
5thOFFOFFONONOFF
S41stONOFFOFFOFFON
1st
↓
4th		ON
↓
OFF		OFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
S31stONOFFOFFOFFON
1st
↓
3rd E/B		ON
↓
OFF		OFFOFFOFFON
↓
OFF
3rd E/BOFFOFFOFFOFFOFF
S21stONOFFOFFOFFON
2nd E/B
↓
4th		ON
↓
OFF		OFFONOFFOFF
↓
ON
S11st E/BONOFFOFFOFFOFF
Fail-safe Operation when Shift Solenoid Valve SR is Malfunctioning:
Shift Lever PositionGearShift Solenoid Valve S1Shift Solenoid Valve S2Shift Solenoid Valve SRShift Solenoid Valve SL1Shift Solenoid Valve SL2
D
S5		1stONOFFOFFOFFON
2ndONONOFFOFFON
3rdOFFONOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFONOFF
S41stONOFFOFFOFFON
2ndONONOFFOFFON
3rdOFFONOFFOFFON
4thOFFOFFOFFOFFON
S31stONOFFOFFOFFON
2ndONONOFFOFFON
3rd E/B
↓
3rd		OFFONOFFOFFOFF
↓
ON
S21stONOFFOFFOFFON
2ndONONOFFOFFOFF
S11st E/BONOFFOFFOFFOFF
Fail-safe Operation when Shift Solenoid Valve S1 and S2 are Malfunctioning:
Shift Lever PositionGearShift Solenoid Valve S1Shift Solenoid Valve S2Shift Solenoid Valve SRShift Solenoid Valve SL1Shift Solenoid Valve SL2
D
S5		4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
5thOFFOFFONONOFF
S44thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
S33rd
↓
3rd E/B		OFFOFFOFFOFFON
↓
OFF
3rd
↓
3rd E/B		OFFOFFOFFOFFON
↓
OFF
3rd E/BOFFOFFOFFOFFOFF
S21stOFFOFFOFFOFFON
Fail 4thOFFOFFONOFFOFF
↓
ON
S11st E/BOFFOFFOFFOFFOFF
Fail-safe Operation when Shift Solenoid Valve S2 and SR are Malfunctioning:
Shift Lever PositionGearShift Solenoid Valve S1Shift Solenoid Valve S2Shift Solenoid Valve SRShift Solenoid Valve SL1Shift Solenoid Valve SL2
D
S5		1stONOFFOFFOFFON
1st
↓
4th		ON
↓
OFF		OFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFON
↓
OFF		OFF
↓
ON
S41stONOFFOFFOFFON
1st
↓
4th		ON
↓
OFF		OFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
S31stONOFFOFFOFFON
1st
↓
3rd		ON
↓
OFF		OFFOFFOFFON
↓
ON
3rd E/B
↓
3rd		OFFOFFOFFOFFOFF
↓
ON
S21stONOFFOFFOFFON
1st E/B
↓
1st		ONOFFOFFOFFOFF
↓
ON
S11st E/BONOFFOFFOFFOFF
Fail-safe Operation when Shift Solenoid Valve S1 and SR are Malfunctioning:
Shift Lever PositionGearShift Solenoid Valve S1Shift Solenoid Valve S2Shift Solenoid Valve SRShift Solenoid Valve SL1Shift Solenoid Valve SL2
D
S5		4th
↓
3rd		OFFOFF
↓
ON		OFFOFFON
3rdOFFONOFFOFFON
3rdOFFONOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFON
↓
OFF		OFF
↓
ON
S44th
↓
3rd		OFFOFF
↓
ON		OFFOFFON
3rdOFFONOFFOFFON
3rdOFFONOFFOFFON
4thOFFOFFOFFOFFON
S33rdOFFOFF
↓
ON		OFFOFFON
↓
ON
3rdOFFONOFFOFFON
↓
ON
3rd E/B
↓
3rd		OFFONOFFOFFOFF
↓
ON
S21stOFFOFFOFFOFFON
2ndOFFONOFFOFFOFF
S11st E/BOFFOFFOFFOFFOFF
Fail-safe Operation when Shift Solenoid Valve S1, S2 and SR are Malfunctioning:
Shift Lever PositionGearShift Solenoid Valve S1Shift Solenoid Valve S2Shift Solenoid Valve SRShift Solenoid Valve SL1Shift Solenoid Valve SL2
D
S5		4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFON
↓
OFF		OFF
↓
ON
S44thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
4thOFFOFFOFFOFFON
S33rdOFFOFFOFFOFFON
↓
ON
3rdOFFOFFOFFOFFON
↓
ON
3rd E/B
↓
3rd		OFFOFFOFFOFFOFF
↓
ON
S21stOFFOFFOFFOFFON
1st E/B
↓
1st		OFFOFFOFFOFFOFF
↓
ON
S11st E/BOFFOFFOFFOFFOFF
A750F AUTOMATIC TRANSMISSION / TRANSAXLE
Land Cruiser URJ200 URJ202 GRJ200 VDJ200
AUTOMATIC TRANSMISSION SYSTEM for 1GR-FE