Lexus RX300 (MCU15). Manual — part 240
D10072
Engine & ECT ECU
Pattern Select
Switch
J/B No. 3
MPX2
E9
18
W–R
11
B5
MPX1
SNOW
B8
15
Y–B
3
4
W–B
3D
3H
8
9
IH
W–B
Body ECU
DI–192
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
LEXUS RX300 (RM785E)
Pattern Select Switch Circuit
CIRCUIT DESCRIPTION
When 2nd start mode is selected with the pattern select switch, the Engine & ECT ECU controls the solenoid
valves and the transmission starts from 2nd gear.
In D range, the transmission automatically shifts up through 3rd to O/D as usual.
In 2nd range, the transmission is held in 2nd gear.
WIRING DIAGRAM
DI84L–01
D10073
4
3
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–193
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check pattern select switch.
PREPARATION:
Disconnect the pattern select switch connector.
CHECK:
Check continuity between terminals 1 and 2 of pattern select
switch connector when the select switch is set to SNOW posi-
tions.
OK:
Switch condition
Tester connection
Specified condition
SNOW
3 – 4
Continuity
If the continuity is not as specified, replace the switch.
Q00758
Engine & ECT ECU
+B
OD1
E10
24
Y–G
C16
14
OD
Cruise Conrol ECU
DI–194
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
LEXUS RX300 (RM785E)
O/D Cancel Signal Circuit
CIRCUIT DESCRIPTION
While driving uphill with cruise control activated, in order to minimize gear shifting and provide smooth cruis-
ing overdrive may be prohibited temporarily under some condition.
The cruise control Engine & ECT ECU sends O/D cut signals to the Engine & ECT ECU as necessary and
the Engine & ECT ECU cancels overdrive shifting until these signals are discontinued.
WIRING DIAGRAM
DI0D0–07
D00835
ON
OD1
(+)
(–)
AB0119
N19917
I00742
ON
O/D
(+)
(–)
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–195
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check voltage between terminal OD1 of Engine & ECT ECU and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure voltage between terminal OD1 of Engine & ECT ECU
and body ground.
OK:
Voltage: 10 – 14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page DI–160).
NG
2
Check voltage between terminal OD of cruise control ECU harness side connec-
tor and body ground.
PREPARATION:
(a)
Disconnect the cruise control ECU connector.
(b)
Turn the ignition switch ON.
CHECK:
Measure voltage between terminal OD of cruise control ECU
harness side connector and body ground.
OK:
Voltage: 10 – 14 V
OK
Check and replace the cruise control ECU.
NG
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