Lexus ES300 (2002 year). Manual — part 331
D02290
Line Pressure
Control Pressure
Current Flow to Solenoid
BE4056
ON
OFF
1 cycle
D01875
GND
5 V/
Division
1 msec./Division
-
DIAGNOSTICS
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
05-443
596
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1760
LINEAR SOLENOID FOF LINE PRESSURE
CONTROL CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
The throttle pressure that is applied to the primary regulator
valve (which modulates the line pressure) causes the solenoid
valve SLT, under electronic control, to precisely and minutely
modulate and generate the line pressure according the extent
of the accelerator pedal depressed or the output of engine pow-
er.
This reduces the function of the line pressure and provides
smooth shifting.
Upon receiving a signal of the throttle valve opening angle, the
ECM controls the line pressure by sending a predetermined (*)
duty ratio to the solenoid valve, modulating the line pressure
and 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
Duty Ratio=A/(A+B) x 100 (%)
DTC No.
DTC Detection Condition
Trouble Area
P1760
Condition (a) or (b) below is detected 1 sec. or more:
(a) SLT-
terminal: 0V
(b) SLT-
terminal: 12V
Open or short in line pressure control solenoid (SLT) circuit
Line pressure control solenoid (SLT)
ECM
Reference:
Check the waveform between terminals SLT+
and SLT- during
the engine idling.
05280-04
C93636
ECM
SLT+
SLT-
E10
17
16
Y-R
Y-B
E1 Electronically Controlled
Transmission Solenoid
E10
G
GR
SLT+
SLT-
1
E2
5
E2
05-444
-
DIAGNOSTICS
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
597
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1
PERFORM ACTIVE TEST BY OBD II SCAN TOOL OR HAND-HELD TESTER
(a)
Warm up the engine.
(b)
Turn the ignition switch OFF.
(c)
Connect the OBD II scan tool or Hand-held tester to the DLC3.
(d)
Turn the ignition switch ON and push the OBD II scan tool or Hand-held tester main SW ON.
(e)
Select the item ”LINE PRESS UP” in the ACTIVE TEST and operate the shift solenoid SLT on the OBD
II scan tool or Hand-held tester.
NOTICE:
The values given below for ”Normal Condition” are representative values, so a vehicle may still be
normal even if its value differs from those listed here. Do not depend solely on the ”Normal Condi-
tion” here when deciding whether or not the part is faulty.
Item
Test Details
Diagnostic Note
LINE PRESS UP
[Test Details]
Operate the shift solenoid SLT and raise the line pressure.
[Vehicle Condition]
Vehicle Stopped.
IDL: ON
[Others]
ON: Line pressure up.
OFF: No action (normal operation)
-
OK
CHECK AND REPLACE ECM(See page
NG
C93266
E1
E2
SLT-
SLT+
C82157
C91564
SLT+
SLT-
-
DIAGNOSTICS
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
05-445
598
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
2
INSPECT TRANSMISSION WIRE(SLT)
(a)
Disconnect the transmission wire connector (E2) from the
transaxle.
(c)
Measure the resistance between the terminals SLT+ and
SLT-.
OK:
Resistance: 5.0 - 5.6
Ω
at 20
°
C (68
°
F)
NG
OK
3
CHECK HARNESS AND CONNECTOR(TRANSMISSION WIRE - ECM)
(a)
Connect the transmission wire connector to the transaxle.
(b)
Disconnect the ECM connector.
(c)
Measure the resistance between terminals SLT+ and
SLT- of ECM connector.
OK:
Resistance: 5.0 - 5.6
Ω
at 20
°
C (68
°
F)
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR(See page
)
OK
CHECK AND REPLACE ECM(See page
)
D25466
1
2
1
2
(+)
(-)
05-446
-
DIAGNOSTICS
ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
599
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
INSPECT LINE PRESSURE CONTROL SOLENOID ASSY(SLT)
(a)
Remove the line pressure control solenoid (SLT).
(b)
Measure the resistance between terminals.
OK:
Resistance: 5.0 - 5.6
Ω
at 20
°
C (68
°
F)
(c)
Connect the positive (+) lead with a 21 W bulb to terminal
2 and the negative (-) lead to terminal 1 of the solenoid
valve connector, then check the movement of the valve.
OK:
The solenoid makes an operating noise.
NG
REPLACE LINE PRESSURE CONTROL
SOLENOID ASSY(SLT)
OK
REPAIR OR REPLACE TRANSMISSION WIRE(See page
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