Toyota Celica 2005 Repair Manual page 1018

DTC P0753
DTC P0758
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valve No. 1 and
No. 2 controlled by ECM. If an open or short circuit occurs in either of the solenoid valves, the ECM controls
the remaining normal solenoid valve to allow the vehicle to be operated smoothly (Fail safe function).
NORMAL
Range
Solenoid valve
No. 1
ON
ON OFF
D
OFF
OFF
OFF
ON
2
ON OFF
OFF OFF
ON
L
ON OFF
X: Malfunctions
HINT:
Check the sift solenoid valve No. 1 when DTC P0753 is output and check the shift solenoid valve No. 2 when
DTC P0758 is output.
DTC No.
The ECM checks for an open or short circuit in the shift sole-
noid valve No. 1/No. 2 circuit when it changes.
The ECM records DTC P0753 or P0758 if condition (a) or (b) is
detected once, but it does not blink the MIL.
After ECM detects condition (a) or (b) continuously 2 times or
more in 1−trip, it causes the MIL to light up until condition (a) or
P0753 (b) disappears.
P0758
After that, if the ECM detects condition (a) or (b) once, it starts
lighting up MIL again.
(a) Solenoid resistance is 8 Ω or less (short circuit) when the
solenoid is energized.
(b) Solenoid resistance is 100 kΩ or more (open circuit) when
the solenoid is not energized.
2005 CELICA (RM1131U)
DIAGNOSTICS
Shift Solenoid A Electrical Malfunction
(Shift Solenoid Valve S1 )
Shift Solenoid B Electrical Malfunction
(Shift Solenoid Valve S2 )
SHIFT SOLENOID VALVE
NO. 1 MALFUNCTIONING
Solenoid valve
Gear
No. 2 No. 1
X
ON 1st
2nd
X
3rd
X
ON
O/D
X
ON 1st X
2nd
X
3rd X
ON 1st X
X
2nd
DTC Detecting Condition
− AUTOMATIC TRANSAXLE (U341E)
SHIFT SOLENOID VALVE
NO. 2 MALFUNCTIONING
Solenoid valve
Gear
No. 2 No. 1
OFF
3rd ON
OFF
3rd ON
3rd
OFF OFF
ON OFF
O/D
OFF 3rd ON
OFF
3rd ON
OFF 3rd OFF
OFF
1st ON
OFF
ON
3rd
S Open or short in shift solenoid valve No. 1/No. 2 circuit
S Shift solenoid valve No. 1/No. 2
S ECM
1017
BOTH SHIFT SOLENOID
VALVES MALFUNCTIONING
Gear when shift selector is
Gear
manually operated
No. 2
X 2nd
2nd
X
3rd
X
3rd
X
X 2nd
2nd
X
3rd
X
2nd
X
X
2nd
Trouble Area
DI−817
DI32W−11
3rd
3rd
3rd
3rd
3rd
3rd
3rd
3rd
3rd