Lexus RX300 (MCU15). Service manual — part 235
D09086
Engine & ECT ECU
SL1+
SL1–
SL2+
SL2–
S4
E8
20
19
9
8
1
L–B
L–W
R–B
R–Y
5
10
4
9
8
W
B
Y
BR
R
SL2 Solenoid Vavle
S4 Solenoid Valve
SL1 Solenoid Valve
Automatic Transaxle
E8
E8
E8
E6
R–Y
R–W
To Cruise Control ECU
DI–172
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
LEXUS RX300 (RM785E)
WIRING DIAGRAM
D03339
D03338
D03340
D03440
SL1+
SL1–
Engine & ECT ECU
SL2+
SL2–
S4
Engine & ECT ECU
Engine & ECT ECU
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–173
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Measure resistance between terminals of Engine & ECT ECU.
PREPARATION:
Disconnect the connector from Engine & ECT ECU.
CHECK:
(a)
Measure resistance between terminal SL1+ and SL2– of
Engine & ECT ECU connector.
(b)
Measure resistance between terminal SL2+ and SL2– of
Engine & ECT ECU connector.
(c)
Measure resistance between terminal S4 of Engine &
ECT ECU connector and body ground.
OK:
Resistance:
SL1+ – SL1–: 5.3 ± 0.2 Ω
SL2+ – SL2–: 5.3 ± 0.2 Ω
S4 – Body ground: 13 ± 2 Ω
OK
Check and replace the Engine & ECT ECU (See
page IN–32).
NG
D03341
D03344
D03342
D03441
SL1–
SL1+
SL1+
Solenoid Connector
Solenoid Connector
Solenoid Connector
SL2–
SL2+
S4
S4
SL1–
SL2+
SL2–
DI–174
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
LEXUS RX300 (RM785E)
2
Check harness and connector between Engine & ECT ECU and automatic trans-
axle solenoid connector.
PREPARATION:
Disconnect the solenoid connector from the automatic trans-
axle.
CHECK:
(a)
Check the harness and connector between terminal
SL1+ or SL1– of Engine & ECT ECU and terminal SL1+
or SL1– of solenoid connector.
(b)
Check the harness and connector between terminal
SL2+ or SL2– of Engine & ECT ECU and terminal SL2+
or SL2– of solenoid connector.
(c)
Check the harness and connector between terminal S4
of Engine & ECT ECU and terminal S4 of solenoid con-
nector.
OK:
There is no open and no short circuit.
NG
Repair or replace the harness or connector.
OK
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–175
LEXUS RX300 (RM785E)
3
Check SL1, SL2 or S4 solenoid valve (See page DI–168).
NG
Replace the solenoid valve.
OK
Repair or replace the solenoid wire.
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