Lexus RX300 (MCU15). Manual — part 238
D03336
NC
–
NC
+
Q08218
Magnet
DI–184
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check resistance between terminals NC
+
and NC
–
of Engine & ECT ECU.
PREPARATION:
Disconnect the connector from Engine & ECT ECU.
CHECK:
Check resistance between terminals NC
+
and NC
–
of Engine &
ECT ECU.
OK:
Resistance: 620 ± 60 Ω
OK
Check and replace the Engine & ECT ECU (See
page IN–32).
NG
2
Check counter gear speed sensor.
PREPARATION:
Remove the counter gear speed sensor from transaxle.
CHECK:
(a)
Measure resistance between terminals 1 and 2 of speed
sensor.
(b)
Check voltage between terminals 1 and 2 of the speed
sensor when a magnet is put close to the front end of the
speed sensor then taken away quickly.
OK:
(a) Resistance: 620 ± 60 Ω
(b) Voltage is generated intermittently.
HINT:
The voltage generated is extremely low.
NG
Replace the counter gear speed sensor.
OK
Check and repair the harness and connector
between Engine & ECT ECU and counter gear
speed sensor (See page IN–32).
D02290
Line Pressure Con-
trol Pressure
Current Flow to Solenoid
BE4056
ON
OFF
1 cycle
Duty Ratio =
A + B
A
x 100 (%)
D01875
GND
5 V/
Division
1 msec./division
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–185
LEXUS RX300 (RM785E)
DTC
P1760
Linear Solenoid for Line Pressure Control
Circuit Malfunction (SLT)
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-
late and generate 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
& 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
DTC No.
DTC Detecting Condition
Trouble Area
P1760
a) or b) condition below are detected 1 seconds or more.
a) SLT
–
terminal: 0 V
b) SLT
–
terminal: 12 V
S Open or short in SLT solenoid valve circuit
S SLT solenoid valve
S Engine & ECT ECU
Reference:
Waveform between terminals SLT
+
and SLT
–
during engine id-
ling.
DI1O9–17
D01772
SLT Solenoid
Valve
Automatic Transaxle
E1
2
E1
7
E6
3
E6
2
G–B
G
SLT
+
SLT–
Engine & ECT ECU
O
G
DI–186
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
LEXUS RX300 (RM785E)
WIRING DIAGRAM
D03445
D03446
D02968
D03729
2
1
2
1
When battery voltage is applied.
When battery voltage is cut off.
Valve moves in
direction
in illustration at left.
Valve moves in
direction
in illustration at left.
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–187
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check SLT solenoid valve.
PREPARATION:
(a)
Jack up the vehicle.
(b)
Remove the oil pan.
(c)
Disconnect the solenoid connector.
CHECK:
Check the solenoid resistance.
Measure resistance between terminals 1 and 2 of sole-
noid connector.
OK:
Resistance: 5.0 – 5.6 Ω
CHECK:
Check the solenoid operation.
Connect positive (+) lead with an 8 – 10W bulb to terminal
1 of solenoid connector and negative (–) lead to terminal
2, then check the movement of the valve.
OK:
NG
Replace SLT solenoid valve.
OK
2
Check harness and connector between SLT solenoid valve and Engine & ECT
ECU (See page IN–32).
NG
Repair or replace harness or connector.
OK
Replace Engine & ECT ECU (See page
IN–32).
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