Toyota AVENSIS 2000 Supplement Manual page 173

DI–42
DTC P1760
Line Pressure Con-
trol Pressure
Current Flow to Solenoid
ON
OFF
1 cycle
DTC No.
(a) or (b) condition below is detected for 1 second or more.
–
P1760 (a) SLT terminal: 0V
–
(b) SLT terminal: 12V
GND
1 msec. / Div.
AVENSIS/CORONA SUP (RM781E)
DIAGNOSTICS
Linear Solenoid for Line Pressure Control
Circuit malfunction (SLT Solenoid Valve)
CIRCUIT DESCRIPTION
The throttle pressure that is applied to the primary regulator
valve (which modulates line pressure) causes the SLT solenoid
valve, under electronic control, to precisely and minutely modu-
lates and generates line pressure according to the accelerator
pedal effort, or engine power output detected.
This reduces the function of line pressure and provides smooth
shifting characteristics.
Upon receiving the throttle valve opening angle signal, Engine
D02635
and ECT ECU controls the line pressure by sending a predeter-
mined (*) duty ratio to the solenoid valve, modulating the line
pressure, generating 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
HINT:
Refer to the chart for the wave form between terminals SLT
and SLT
5 V / Div.
D01875
– AUTOMATIC TRANSAXLE (A246E)
Duty Ratio =
S Open or short in SLT solenoid valve circuit
S SLT solenoid valve
S Engine and ECT ECU
–
during engine idling.
A
x 100 (%)
A + B
Trouble Area
DI61W–05
+