Toyota ZZT230 series Repair Manual page 469

Dl458
P1760
DTC
Une
Pressure Con­
Pressure
trol
Current
low
ON
OFF
cycle
1
DTCNo.
(a) or (b) condiUon
P1760177 (a) SLT-terminar:
SLT-termlnal:
GND
1 msecJOiv.
Linear Solenoid for Line Pressure Control
Circuit Malfunction (Soleniod valve SLT )
CIRCUIT DESCRIPTION
The throttle pressure that is applied to the primary regulator
valve (which modulates line pressure) causes the shift solenoid
valve SLT,
modulate and generate line pressure according to the accelera­
tor pedal effort, or engine power output detected.
D<m90
This reduces the function of line pressure and provides smooth
to Solenoid
shifting characteristics.
Upon receiving the throttle valve opening angle signal,
controls the line pressure by sending a predetermined n duty
ratio to the solenoid valve, modulating the line pressure, gener­
ating throttle pressure.
(") Duly Ratio
The duty ratio is the ratio
For example, if
is the period of non-continuity, then
'""'
DTC Detecti'lg Condition
below Is clelected 1 second or more.
OV
12V
HINT:
Refer to the chart for the wave form between terminals
and SLT during engine idling.
5 V/Div.
001875
under electronic control, to precisely and minutely
the er
of i
p od
is the period of continuity in one cycle, and 8
A
Duty Rati o
=
Trouble Area
•Open or short irJ shift solenoid valve SLT circuit
•Shift solenoid valve SLT
• ECM
ECM
e
of continuity in one y l
c c
X 1 0 0 ( % )
SLT+
.