Lexus ES300 (1997 year). Manual — part 380
F00108
Battery
MAIN
FL Block
ALT
B–G
AM1
1K
2
Ignition
Switch
Instrument Panel J/B
1B
F6
F11
1
A20
GND3
B–R
1
Instrument Panel J/B
1
A19
B–Y
J/C
ECU–IG
4
B–R
A
ABS & TRAC ECU
9
A21
1J
J3
IG1
W–B
W
GND1
GND2
2
1K
1
A
B–R
A21
W–B
W–B
W–B
W–B
W–B
EA
8
15
EB
10
9
W–B
Battery
MAIN
FL Block
ALT
B–G
AM1
1K
2
Ignition
Switch
Instrument Panel J/B
1B
F6
F11
1
A20
GND3
B–R
1
Instrument Panel J/B
1
A19
B–Y
J/C
ECU–IG
4
B–R
A
ABS & TRAC ECU
9
A21
1J
J3
IG1
W–B
W
GND1
GND2
2
1K
1
A
B–R
A21
W–B
W–B
W–B
W–B
W–B
EA
8
15
EB
10
9
W–B
Battery
MAIN
FL Block
ALT
B–G
AM1
1K
2
Ignition
Switch
Instrument Panel J/B
1B
F6
F11
1
A20
GND3
B–R
1
Instrument Panel J/B
1
A19
B–Y
J/C
ECU–IG
4
B–R
A
ABS & TRAC ECU
9
A21
1J
J3
IG1
W–B
W
GND1
GND2
2
1K
1
A
B–R
A21
W–B
W–B
W–B
W–B
W–B
EA
8
15
EB
10
9
W–B
Battery
MAIN
FL Block
ALT
B–G
AM1
1K
2
Ignition
Switch
Instrument Panel J/B
1B
F6
F11
1
A20
GND3
B–R
1
Instrument Panel J/B
1
A19
B–Y
J/C
ECU–IG
4
B–R
A
ABS & TRAC ECU
9
A21
1J
J3
IG1
W–B
W
GND1
GND2
2
1K
1
A
B–R
A21
W–B
W–B
W–B
W–B
W–B
EA
8
15
EB
10
9
W–B
Battery
MAIN
FL Block
ALT
B–G
AM1
1K
2
Ignition
Switch
Instrument Panel J/B
1B
F6
F11
1
A20
GND3
B–R
1
Instrument Panel J/B
1
A19
B–Y
J/C
ECU–IG
4
B–R
A
ABS & TRAC ECU
9
A21
1J
J3
IG1
W–B
W
GND1
GND2
2
1K
1
A
B–R
A21
W–B
W–B
W–B
W–B
W–B
EA
8
15
EB
10
9
W–B
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI–297
449
1997 LEXUS ES300 (RM511U)
DTC
41
IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the actuators.
DTC No.
DTC Detecting Condition
Trouble Area
41
Detection of any conditions from (1) through (3):
(1) Vehicle speed is 3 km/h (1.9 mph) or more and battery
voltage is less than 9.5 V continues for 10 sec. or
more.
(2) Battery voltage has never exceeded more than 17.0 V
and has become less than 9.5 V within 2.16 sec., under
malfunction of solenoid relay monitor after the solenoid
relay is ON, at ECU AST terminal voltage of ECU has
become 8.0 V or more or under malfunction of motor
relay monitor and after the motor relay is ON, motor
relay monitor has become ON.
(3) Battery voltage is more than 17.0 V continues for 1.2
sec. or more or battery voltage has become more than
17.0 V within 2.16 sec. and solenoid or motor relay
monitor is under malfunction condition.
Battery
IC regulator
Power source circuit
ECU
Fail safe function: If trouble occurs in the power source circuit, the ECU cuts off current to the ABS & TRAC
solenoid relay and prohibits ABS control and TRAC control.
WIRING DIAGRAM
DI0C6–01
F00058
IG1
GND
ON
(+)
(–)
IG1
GND
ON
(+)
(–)
IG1
GND
ON
(+)
(–)
IG1
GND
ON
(+)
(–)
F00059
GND
(+)
(–)
LOCK
GND
(+)
(–)
LOCK
GND
(+)
(–)
LOCK
GND
(+)
(–)
LOCK
DI–298
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
450
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check battery positive voltage.
OK:
Voltage: 10 – 14 V
NG
Check and repair the charging system.
OK
2
Check voltage between terminals IG1 and GND of ABS & TRAC ECU connector.
PREPARATION:
Remove ABS & TRAC ECU with connectors still connected.
CHECK:
(a)
Turn the ignition switch ON.
(b)
Measure voltage between terminals IG1 and GND of ABS
& TRAC ECU connector.
OK:
Voltage: 10 – 14 V
NG
Check and replace ABS & TRAC ECU.
OK
3
Check continuity between terminals GND of ABS & TRAC ECU connector and
body ground.
CHECK:
Measure resistance between terminal GND of ABS & TRAC
ECU connector and body ground.
OK:
Resistance: 1
Ω
or less
NG
Repair or replace harness or connector.
OK
F00073
Instrument
Panel J/B
ECU–IG
Instrument
Panel J/B
ECU–IG
Instrument
Panel J/B
ECU–IG
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI–299
451
1997 LEXUS ES300 (RM511U)
4
Check ECU–IG fuse.
PREPARATION:
Remove ECU–IG fuse from Instrument Panel J/B.
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 (See attached
wiring diagram).
OK
Check for open in harness and connector between ABS & TRAC ECU and battery
(See page
).
DI–300
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
452
1997 LEXUS ES300 (RM511U)
DTC
43
ABS Control System Malfunction
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
43
Detection of any conditions from (1) through (8):
(1) During TRAC is in non–operation and ABS is
output DTC, but TRAC is not during initial lamp
checking, terminal WA of ECU is ON and engine
speed is 500 rpm or more continues for 1 sec. or
more.
(2) Solenoid relay circuit is open or short.
(3) Motor relay circuit is open or short.
(4) ABS solenoid circuit is open or short.
(5) TRAC solenoid circuit is open or short.
(6) Speed sensor is under malfunction condition.
(7) IG power source is down or raise.
(8) Pump motor is lock.
ABS control system
INSPECTION PROCEDURE
1
Check the DTC for the ABS (See page
*1
Repair ABS control system according to the
code output.
*2
Check for ECU connected to malfunction indicator lamp.
*1: Output NG code
*2: Malfunction indicator lamp remains ON.
DI0C7–01
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