Toyota ZZT230 series Repair Manual page 395

Dl-184
Fall safe function:
If either of the shift solenoid valve circuits develops an open or short, the
ON
and OFF to shift to the gear positions shown in the table below. The
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
sending current to the short circuited solenoid)
NORMAL
Solenoid Valve
Gear
SL 1 SL2
ON ON O FF 1
s
t
O FF ON O FF 2nd
OF F OFF 3
r
d
OFF ON O lD
S4
SHIFf SOLENOID
MALFUNCTIONING SL2 MALFUNCTIONING
Solenoid Valve
Gear
54
SL 1 SL2
ON ON X
1st
O FF ON
X 2nd
OF F
X
3rd
OF F X
3r d
SHIFf SOLENOID SL2 AND SHIFT SOLENOID SL 1, SL2
54
MALFUNCTIONING
SL1 SL2 S4 Ge ar
Sol e noi d Val v e
X
X 3rd
�
O F
OFF X
X
3rd
X 3rd
X
X
3rd
X
DIAGNOSTICS
.
SHIFf SOLENOID SL
Driving at 3rd or OlD
Solenoid Valve
Gear
SL1 SL2 S4
3r d
OF F
X
�
F
O
F
X OF
�
3rd
O F
X OFF O FF
3rd
X OFF ON OlD
SHIFf SOLENOID SL 1 AN
Solenoid Valve
Gear
SL1 SL2 54
X X OF F 3rd
X
X O FF
3rd
X X OFF
3rd
X X OlD
ON
S4
AND MALFUNCTIONING
Solenoi d Valve
Gear
SL 1 SL2 54
X X
X
3rd
X X 3rd
X
X
X X 3rd
X X X
3rd
-
AUTOMATIC TRANSAXLE IU240El
ECM
ECM
MALFUNCTIONING
1
o 2n
r d
1st
Solenoid Valve
54 Gear
SL 1 SL2
ON OFF 2nd
X
X
ON OFF 2nd
o
o
r r
X
d
3r
o
r
ON
X
3rd
SHIFT SOLENOID SL 1 AND S4
Drivi n g at 3rd or 0/D
Solenoid Valve
Gear
SL 1 SL2
54
ON
X
3rd
ON
X 3rd
X
�
O F
X OF F X
3rd
X OF F X
3rd
turns the other shift solenoid
also turns the shift solenoid
ECM
stops
SHIFf SOLENOID SL2
MALFUNCTIONING
Solenoid Valve
Gear
SL 1 SL2 54
X OF F 3rd
OFF
X OFF 3rd
X OFF 3rd
ON
X OlD
MALFUNCTIONING
Driving at 1st or 2nd
Sol e noid Valve
Gear
SL1 SL2 54
ON
X X 2nd
ON
X X
2nd
f
O F
X
X 2nd
f
O F
X 2n d
X