Toyota ZZT230 series, Repair Manual

Page: 469 / 821

Dl458
TRANSAXLE
DTC
P1760
Linear Solenoid for Line Pressure Control
Circuit Malfunction (Soleniod valve SLT )
CIRCUIT DESCRIPTION
Une
Pressure Con­
trol
Pressure
The throttle pressure that is applied to the primary regulator
valve (which modulates line pressure) causes the shift 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.
ON
OFF
DTCNo.
P1760177
GND
Current
low
to Solenoid
D<m90
1 cycle
'""'
This reduces the function of line pressure and provides smooth
shifting characteristics.
Upon receiving the throttle valve opening angle signal,
ECM
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
of
the
p
er
i
od
of continuity in one
c
y
c
l
e
.
For example, if
A
is the period of continuity in one cycle, and 8
is the period of non-continuity, then
Duty Ratio
=
X
100 (%)
DTC Detecti'lg Condition Trouble Area
(a) or (b) condiUon below Is clelected 1 second or more.
•Open or short irJ shift solenoid valve SLT circuit
(a)
SLT-terminar:
OV
•Shift solenoid valve SLT
SLT-termlnal:
12V • ECM
HINT:
Refer to the chart for the wave form between terminals
SLT+
5 V/Div.
and SLT during engine idling.
1 msecJOiv.
001875