Lexus ES300 (1997 year). Manual — part 434
AB0119
N19920
I00743
ON
D
(–)
(+)
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–513
665
1997 LEXUS ES300 (RM511U)
3
Check voltage between terminal D of cruise control ECU connector and body
ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of ECU connector and
body ground when shifting into D position and other positions.
OK:
Shift Position
Voltage
D position
10 – 14 V
Other positions
Below 1 V
OK
Proceed to next circuit inspection shown on
problem symptom table (See page
NG
4
Check harness and connector between cruise control ECU and park/neutral
position switch (See page
NG
Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page
).
N21223
Cruise Control ECU
9
B
B–R
A
Junction
Connector
A
Instrument Panel J/B
1J
1K
B–Y
4
Ignition Switch
2
Instrument Panel J/B
AM1
1J
B–G
1B
ALT
1K
W
FL MAIN
Battery
16
GND
W–B
A
Junction
Connector
A
II
F6
B–R
1
2
IG1
1J
B–R
J3
J15
Instrument Panel J/B
J11
C14
AM1
C14
ECU–IG
1
9
J13
1
2
8
7
J9
J8
Junction Connector
2
1
A
A
W–B
DI–514
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
666
1997 LEXUS ES300 (RM511U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc.. When terminal GND and the cruise
control ECU case are grounded.
WIRING DIAGRAM
DI0F6–01
N20675
Instrument Panel Junction Block No.1
ECU–IG
Fuse
AB0119
N19921
I00744
ON
GND
(–)
(+)
B
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
DI–515
667
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check ECU–IG fuse.
PREPARATION:
Remove the ECU–IG fuse from instrument panel junction block
No.1.
CHECK:
Check continuity of ECU–IG fuse.
OK:
Continuity
NG
Check for short in all the harness and compo-
nents connected to ECU–IG fuse.
OK
2
Check voltage between terminals B and GND of cruise control ECU connector.
PREPARATION:
(a)
Remove the ECU with connector still connected.
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals B and GND of ECU con-
nector.
OK:
10 – 14 V
OK
Proceed to next circuit inspection shown on
problem symptom table (See page
NG
N19922
GND
DI–516
–
DIAGNOSTICS
CRUISE CONTROL SYSTEM
668
1997 LEXUS ES300 (RM511U)
3
Check resistance between terminal GND of cruise control ECU connector and
body ground.
CHECK:
Measure resistance between terminal GND of ECU connector
and body ground.
OK:
Resistance: Below 1
Ω
NG
Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween cruise control ECU and battery
(See page
).
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