Toyota Celica 2005 Repair Manual page 930

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 to shift to the gear positions shown in the table below. The ECM also turns the shift solenoid
valve DSL OFF at the same time. If both solenoids are malfunction, hydraulic control cannot be performed
electronically and must be done manually.
Manual shifting as shown in the following table must be done (In the case of a short circuit, the ECM stops
sending current to the short circuited solenoid).
NORMAL
Solenoid Valve
Gear
SL1 SL2 S4
ON
OFF
ON
OFF ON
OFF
OFF OFF
ON
OFF
SHIFT SOLENOID S4
MALFUNCTIONING
Solenoid Valve
Gear
SL1 SL2 S4
ON ON X
OFF ON
X
OFF
X
OFF
X
SHIFT SOLENOID SL2 AND
S4 MALFUNCTIONING
Solenoid Valve
Gear
SL1 SL2 S4
ON
X
X
OFF
OFF
X X
X X
X X
2005 CELICA (RM1131U)
DIAGNOSTICS
SHIFT SOLENOID SL1 MALFUNCTIONING
Driving at 3rd or O/D
Solenoid Valve
SL1 SL2 S4
ON
1st OFF
X
OFF
ON
2nd X OFF
OFF
3rd X OFF OFF
O/D X ON
OFF
SHIFT SOLENOID SL1 AND
SL2 MALFUNCTIONING
Solenoid Valve
SL1 SL2 S4
1st
X OFF
X
2nd X OFF
X
X X OFF
3rd
3rd X X ON
SHIFT SOLENOID SL1, SL2
AND S4 MALFUNCTIONING
Solenoid Valve
SL1 SL2 S4
3rd X
X
3rd X
X
3rd X X
3rd X X
− AUTOMATIC TRANSAXLE (U240E)
Driving at 1st or 2nd
Solenoid Valve
Gear
SL1 SL2
3rd X ON
3rd X ON
OFF
3rd X
ON
OFF
O/D X
ON
SHIFT SOLENOID SL1 AND S4 MALFUNCTIONING
Driving at 3rd or O/D
Solenoid Valve
Gear
SL1 SL2
ON
3rd
X
OFF
ON
3rd
X
OFF
3rd X OFF
O/D X OFF
Gear
X
3rd
X 3rd
X
3rd
X
3rd
929
SHIFT SOLENOID SL2
MALFUNCTIONING
Solenoid Valve
Gear
S4
SL1 SL2
ON
2nd
OFF
OFF
OFF 2nd
OFF
OFF
3rd
ON
ON
3rd
Driving at 1st or 2nd
Solenoid Valve
Gear
SL1 SL2
S4
ON
3rd X
X
3rd X ON
X
OFF
3rd X
X
ON
OFF
X 3rd X
ON
DI−729
Gear
S4
X OFF 3rd
X 3rd
OFF
3rd
X OFF
ON O/D
X
Gear
S4
X 2nd
X 2nd
X 2nd
X 2nd