Lexus RX300 (MCU15). Service manual — part 241
DI–196
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
LEXUS RX300 (RM785E)
3
Check harness and connector between cruise control ECU and Engine & ECT
ECU (See page IN–32).
NG
Repair or replace the harness or connector.
OK
Check and replace the Engine & ECT ECU
(See page IN–32).
D10061
1
3A
5
3E
R–W
1
C12
Combination Meter
R–W
11
IJ1
R–W
9
E9 ODLP
Engine & ECT ECU
R–W
13
1K
Heater
7
1C
B–Y
4 IG1
Ignition Switch
AM1 2
W–L
6
1C
AM1 2
1
1
1A
W
5
F11 Fusible Link
Block
ALT
3
W
Battery
W–B
O2
O/D Main Switch
6
3 GR–L
IJ1
16
GR–L
IH1
7
GR–L
12
E6 ODMS
IH
W–B
9
3H
8
3H
6
15
IJ1
(RHD)(LHD)
J/B No. 3
Instrument Panel J/B
Instrument Panel J/B
J/B No. 3
O/D OFF
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–197
LEXUS RX300 (RM785E)
O/D Main Switch & O/D OFF Indictor Light Circuit
CIRCUIT DESCRIPTION
The O/D main switch is a momentary type switch. When pressing the O/D main switch, the O/D OFF indicator
light lights up and Engine & ECT ECU prohibits shifting to O/D, and when pressing it again, the O/D OFF
indicator light goes off and Engine & ECT ECU allows shifting to O/D. Turning the IG switch OFF will reset
the O/D OFF indicator light.
WIRING DIAGRAM
DI1AW–09
D07491
1
3
DI–198
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check operation of O/D main switch.
PREPARATION:
Turn the ignition switch ON.
CHECK:
(a)
Check O/D OFF indicator light when O/D main switch is
pushed in to ON.
(b)
Check O/D OFF indicator light when O/D main switch is
pushed again.
OK:
(a) O/D OFF indicator light lights up.
(b) O/D OFF indicator light goes off.
OK
Proceed to next inspection shown on symp-
toms problem tables (See page DI–160).
NG
2
Check and replace the combination meter (See page BE–68).
NG
Replace the
combination meter.
OK
3
Check O/D main switch.
PREPARATION:
Disconnect the O/D main switch connector.
CHECK:
Check continuity between terminals 1 and 3 of O/D main switch
connector.
OK:
O/D main switch condition
Specified condition
Press continuously O/D main switch
Continuity
Release O/D main switch
No continuity
NG
Replace and repair O/D main switch.
OK
D07186
ON
(–)
(+)
ODMS
D07185
ON
ODLP
(–)
(+)
–
DIAGNOSTICS
AUTOMATIC TRANSAXLE
DI–199
LEXUS RX300 (RM785E)
4
Check voltage between terminal ODMS of Engine & ECT ECU and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Check voltage between terminal ODMS of Engine & ECT ECU
and body ground when O/D main switch is ON and OFF.
OK:
O/D main switch condition
Specified voltage
Press continuously O/D main switch
Below 1.0 V
Release O/D main switch
10 – 14 V
OK
Check and replace the Engine & ECT ECU (See
page IN–22).
NG
5
Check voltage between terminal ODLP of Engine & ECT ECU and body ground.
PREPARATION:
(a)
Disconnect the connector of Engine & ECT ECU.
(b)
Turn the ignition switch ON.
CHECK:
Check voltage between terminal ODLP of Engine & ECT ECU
and body ground.
OK:
Voltage: 7.5 – 14 V
OK
Check and replace the Engine & ECT ECU (See
page IN–22).
NG
Check and replace harness and connector between combination meter and Engine & ECT ECU,
O/D main switch and Engine & ECT ECU, O/D main switch and body ground (See page IN–22).
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