Lexus ES300 (1997 year). Manual — part 381
F00062
ECM
ABS & TRAC ECU
NEO
NEO
E7
A20
BR–W
19
15
ECM
ABS & TRAC ECU
NEO
NEO
E7
A20
BR–W
19
15
ECM
ABS & TRAC ECU
NEO
NEO
E7
A20
BR–W
19
15
ECM
ABS & TRAC ECU
NEO
NEO
E7
A20
BR–W
19
15
ECM
ABS & TRAC ECU
NEO
NEO
E7
A20
BR–W
19
15
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI–301
453
1997 LEXUS ES300 (RM511U)
DTC
44
NE Signal Circuit
CIRCUIT DESCRIPTION
The ABS & TRAC ECU receives engine speed signals (NE signals) from the ECM.
DTC No.
DTC Detecting Condition
Trouble Area
44
Condition (1) or (2) is detected:
(1) TRAC is in operation and engine speed is 0 rpm
continues for 2.4 sec. or more.
(2) TRAC is in non–operation, sift lever is not in P or N
position, both the front right and left wheels’ speed
is 30 km/h (19 mph) or more, engine speed is 0 rpm
and does not have communication malfunction, and
malfunction information of engine system is OFF.
NEO circuit
ECM
ABS & TRAC ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check for open and short in harness and connector between terminal NEO of
ABS & TRAC ECU and terminal NEO of ECM (See page
).
NG
Repair or replace harness or connector.
OK
DI0C8–01
F00061
NEO
(+)
(–)
ON
F00011
(Reference)
3 – 6 V
Below 1 V
3 ms. 3 ms.
(Reference)
3 – 6 V
Below 1 V
3 ms. 3 ms.
(Reference)
3 – 6 V
Below 1 V
3 ms. 3 ms.
DI–302
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
454
1997 LEXUS ES300 (RM511U)
2
Check voltage between terminal NEO of ABS & TRAC ECU and body ground.
PREPARATION:
(a)
Remove ABS & TRAC ECU with connectors still con-
nected.
(b)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal NEO of ABS & TRAC ECU
and body ground for the engine conditions below.
OK:
Engine condition
Voltage
OFF (IG ON)
3 – 6 V or below 1 V
ON (Idling)
2 – 3 V (Pulse)
G
Check and replace ABS & TRAC ECU or ECM.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
F00105
STOP
7
1C
4
W
1R
Stop
Light
Switch
J27
5
2
ABS & TRAC ECU
A20
Instrument Panel J/B
F11
1B
1
G–W
1S
STP
F6
ALT
B–R
A
16
R6
7
1
BP
R8
W–B
Battery
MAIN
FL Block
BM
B–G
1
1
1R
4
2
Instrument
Panel J/B
G–W
G–W
G–W
Light
Failure
Sensor
Right
Stop
Light
High
Mounted
Stop
Light
J37
Left
Stop
Light
R
H11
2
1
H11
R6
R8
1
2
3
W–B
W–B
W–B
W–B
W–B
W–B
J/C
A
J/C
A
3
1
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI–303
455
1997 LEXUS ES300 (RM511U)
DTC
49
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
49
Battery voltage has never exceed more than 17.0 V and
become less than 9.5 V within 2.16 sec. and the STP
terminal voltage of ECU is under open circuit detecting
limits continues for 3 sec. or more.
Stop light switch
Stop light switch circuit
ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check operation of stop light.
CHECK:
Check that stop light lights up when brake pedal is depressed and turns off when brake pedal is released.
NG
Repair stop light circuit (See page
OK
DI0CA–01
F00060
STP
(+)
(–)
DI–304
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
456
1997 LEXUS ES300 (RM511U)
2
Check voltage between terminal STP of ABS & TRAC ECU and body ground.
PREPARATION:
Remove ABS & TRAC ECU with connectors still connected.
CHECK:
Measure voltage between terminal STP of ABS & TRAC ECU
and body ground when brake pedal is depressed.
OK:
Voltage: 8 – 14 V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
NG
3
Check for open in harness and connector between ABS & TRAC ECU and stop
light Switch (See page
NG
Repair or replace harness or connector.
OK
Check and replace ABS & TRAC ECU.
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