Toyota Celica 2005 Repair Manual page 939

DI−738
DTC P2716
Line Pressure Con-
trol Pressure
Current Flow to Solenoid
ON
OFF
1 Cycle
DTC No.
(a) or (b) condition below is detected 1 second or more.
(1−trip detection logic)
P2716
−
(a) SLT terminal: 0V
−
(b) SLT terminal: 12V
GND
1 msec. / Div.
2005 CELICA (RM1131U)
DIAGNOSTICS
Pressure Control Solenoid "D" Electrical
(Shift Solenoid Valve SLT)
CIRCUIT DESCRIPTION
The throttle pressure that is applied to the primary regulator
valve (which modulates line pressure) causes the solenoid
valve SLT, under electronic control, to precisely and minutely
modulate and generate line pressure according to the accelera-
tor pedal effort, or engine power output detected.
This controls the line pressure and provides smooth shifting
characteristics.
Upon receiving the throttle valve opening angle signal, ECM
D02290
controls the line pressure by sending a predetermined (*) duty
ratio to the solenoid valve, modulating the line pressure, gener-
ating throttle pressure.
(*) Duty Ratio:
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if "A" is the period of continuity in one cycle, and
"B" is the period of non−continuity, then
BE4056
DTC Detecting Condition
Reference:
Waveform between terminals SLT
ling.
5 V / Div.
D01875
− AUTOMATIC TRANSAXLE (U240E)
Duty Ratio =
S Open or short in shift solenoid valve SLT circuit
S Shift solenoid valve SLT
S ECM
938
A
x 100 (%)
A + B
Trouble Area
+ −
and SLT during engine id-
DI4ZT−08