Lexus ES300 (1997 year). Manual — part 433
AB0119
N19917
I00742
ON
(–)
(+)
O/D
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–509
661
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check operation of overdrive.
PREPARATION:
Test drive after engine warms up.
CHECK:
Check that overdrive ON
↔
OFF occurs with operation of OD switch ON–OFF.
NG
Check and repair electronically controlled
transmission.
OK
2
Check voltage between terminal OD of harness side connector of cruise control
ECU and body ground.
PREPARATION:
(a)
Remove the ECU with connector still connected.
(b)
Turn ignition switch ON.
(c)
Disconnect the ECU connector.
CHECK:
Measure voltage between terminal OD of harness side connec-
tor of ECU and body ground.
OK:
Voltage: 10 – 14 V
NG
Go to step 5.
OK
N19918
ECT
(–)
(+)
DI–510
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
662
1997 LEXUS ES300 (RM511U)
3
Check voltage between terminal ECT of cruise control ECU connector and body
ground (On test drive).
PREPARATION:
(a)
Connect the ECU connector.
(b)
Test drive after engine warms up.
CHECK:
Check voltage between terminal ECT of ECU connector and
body ground when OD switch is ON and OFF.
OK:
OD switch position
Voltage
ON
8 – 14 V
OFF
Below 0.5 V
OK
Proceed to next circuit inspection shown on
problem symptom table (See page
NG
4
Check harness and connector between terminal ECT of cruise control ECU and
electronically controlled transmission solenoid (See page
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU.
5
Check harness and connector between terminal OD of cruise control ECU and
terminal OD1 of ECM (See page
).
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
N21222
Park/Neutral
Position Switch
Cruise Control ECU
Junction Connector
Instrument Panel J/B
ALT
B–R
I13
B–G
R–L
Ignition Switch
W
1K
AM1
B–Y
J28
C14
IK2
Battery
FL MAIN
GAUGE
IG1
Junction
Connector
IK2
AM1
1K
J29
F6
F11
1
1
1
2
2
1
2
4
1K
1J
1
1
2
A
A
2
10
9
A
A
3
D
R–L
B–R
B–R
B–R
R–L
R–L
Instrument Panel J/B
Junction
Connector
F
D
D
J30
P1
J25
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–511
663
1997 LEXUS ES300 (RM511U)
Park/Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
When the shift position is put in except D position, a signal is sent from the park/neutral position switch to
the ECU. When this signal is input during cruise control driving, the ECU cancels the cruise control.
WIRING DIAGRAM
DI0F4–01
Input Signal
Indicator Light
Blinking Pattern
Turn PNP switch
OFF (Shift to
except D position)
Light
ON
OFF
SW ON
SW OFF
DI–512
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
664
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG
Proceed to engine troubleshooting.
(See page
OK
2
Input signal check.
PREPARATION:
See input signal check on page
.
CHECK:
Check the indicator light when shifting into except D position.
OK:
The indicator light goes off when shifting into except
D position.
OK
Proceed to next circuit inspection shown on
problem symptom table (See page
NG
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