−
DIAGNOSTICS
AUTOMATIC TRANSAXLE (U341E)
DI
−
821
2005 CELICA (RM1131U)
DTC
P0785
Shift/Timing Solenoid
(Shift Solenoid Valve ST)
CIRCUIT DESCRIPTION
Shift solenoid valve ST is switched ON
−
OFF by a signal from ECM so that let in or out timing of 2nd brake
is adjusted by operating orifice control valve. Therefore, ST solenoid operates when letting in or out reverse
clutch.
If it is broken, the shift shock becomes big.
DTC No.
DTC Detecting Condition
Trouble Area
P0785
ECM memorizes DTC P0785 if (a) or (b) condition below is
detected once or more. (1
−
trip detection logic)
(a) Solenoid resistance is 8
Ω
or lower (short circuit) when
solenoid energized.
(b) Solenoid resistance is 100 k
Ω
or higher (open circuit) when
solenoid is not energized.
S
Open or short in shift solenoid valve ST circuit
S
Shift solenoid valve ST
S
ECM
MONITOR DESCRIPTION
The ECM reduces the gear shift shock when shifting from the N position to the D position and from 3rd gear
to 4th gear by regulating the hydraulic line pressure. To regulate the pressure, the ECM controls shift
−
sole-
noid ST with a duty
−
cycle signal that adjusts the line
−
pressure.
If the ECM detects an open or short in the shift
−
solenoid ST circuit, it will illuminate the MIL and store the
DTC.
MONITOR STRATEGY
Related DTCs
P0785
Shift solenoid valve ST/Range check (Low resistance)
Shift solenoid valve ST/Range check (High resistance)
Required sensors/Components
Shift solenoid valve ST
Frequency of operation
Continuous
Duration
0.032 sec.
MIL operation
Immediate
Sequence of operation
None
TYPICAL ENABLING CONDITIONS
Item
Specification
Minimum
Maximum
The monitor will run whenever this DTC is
not present.
See page DI
−
758
Range check (Low resistance)
Shift solenoid valve
ON
Range check (High resistance)
Shift solenoid valve
OFF
DIAJF
−
03
1021
Содержание Celica 2005
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