Lexus SC300 / Lexus SC400. Service manual — part 976
68
ENGINE CONTROL
1
2
1
2
1
2
1
2
1
2
1
2
1J
6
1J
7
1B
4
1K
4
6
13
14
9
7
4
IE1
16
B–
R
W
B–
Y
L–R
B
Y
W
W–
R
W–
L
W
W–
R
W–
R
B–
O
B–
O
B–
O
B–
O
B–
O
B–
O
W
W–
R
Y
B
L–R
B–Y
W
B–R
B–W
W
B–O
B–W
B–O
B–W
W
IGNITION SW
7. 5A
ST
120
A
A
LT
100
A
A
M1
60A
MA
IN
30A
A
M
2
30A
IN
J
FUSE BLOCK
40A
IGSW
INJ
E
CT
O
R
N
O
.
4
INJ
E
CT
O
R
N
O
.
5
INJ
E
CT
O
R
N
O
.
2
INJ
E
CT
O
R
N
O
.
6
INJ
E
CT
O
R
N
O
.
3
INJ
E
CT
O
R
N
O
.
1
BATTERY
F 9
I15
I9
I10
I7
I11
I8
I6
B–W
4
3
B–O
E20
E18
E20
IJ1
3
IJ1
7
I14
I10
E20
B–W
(A/T)
(M/T)
(A/T)
(M/T)
B–
O
B–
O
B–
O
B–
O
B–
O
B
–
O
B–O
4
11
1
6
AM2
AM1
ACC
IG1
ST1
IG2
ST2
B–O
69
E20
2
2
2
2
1H
12
2
2
2
2
2
1I
10
P
N
3
2
1
2
EB2
1
IE1
15
IJ2
7
IJ1
10
IK1
7
IK1
6
1J
3
1E
12
3
1
2
3
1
3
2
1
4
5
2
I32
EB1
3
EB2
1
VCC
OUT
GND
Y
L–R
B–O
B
Y
B
L–R
W
B–O
B–R
B–Y
B–W
B–R
B–O
B–W
B–O
Y
B
L–R
W
B–O
B–R
B–R
B–W
B–
O
B
B
B
B–
R
B
–
R
B–
Y
W–
B
W
Y
R
L–R
Y
G–
W
G–
W
B–
O
B
L–
O
B
B
B–
W
B–Y
R
L–O
NE
UT
RA
L
ST
AR
T
SW
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
STARTER
RELAY
S 3
S1
2
N1
7. 5A
IGN
30A
EFI
15A
STOP
10A
GAUGE
SPEED SENSOR NO. 1
EF
I
M
AI
N
RE
L
A
Y
S
T
OP
L
IGH
T
SW
TO THEFT DETERRENT
AND DOOR LOCK
ECU (ST)
T
O
ST
AR
T
ER
4
3
B–Y
B–Y
EB1
8
G–W
W
2
1
IJ2
8
1I
5
C23
CLUTCH
START
SW
B
B
(A/
T
)
(M/T)
(A/T)
B–W
(M/T)
IJ1
6
(A/T)
EB
W–
B
B–W
70
ENGINE CONTROL
I22
E18
E17
A
2
SP1
A
33
BATT
B
76
NSW
A
32
+B1
A
31
+B
A
6
W
A
4
STP
B
77
STA
B
20
# 10
B
18
# 30
B
15
# 60
B
19
# 20
B
58
IGF
B
57
IGT
A
1
IGSW
B
3
A
10
A
1
A
15
A
13
A
14
5
4
1
2
IJ2
11
EB1
4
IG2
7
IK2
9
IJ2
3
3A
4
3D
13
+B
TACH
IGF
IGT
B–R
B–O
B–O
L–R
B
Y
B
G–W
R
L–R
Y
B–Y
B–W
B–R
B–O
B
B
L–Y
IH
L–Y
L–Y
BR
L–Y
W–
Y
R–
Y
B–
Y
L–
R
B
Y
B
G–
W
L–Y
B
W–
L
B
L–Y
BR
Y
R
L–R
PP
P
B–
Y
B–
W
B–
O
B–
R
B–
R
B–
Y
B–
O
CH
E
C
K
E
N
G
INE
COMBINATION METER
ENGINE ECU (M/T)
IGNITER
T
O
T
AC
H
O
M
ET
ER
E11
, E12
A
B
I 2
C13
, C1 4
A
B
I33
B
34
B
32
B
35
B
33
E15
B
16
A
24
B
17
B–Y
W
B–R
B–
R
B–
R
G–
Y
V–
R
L–
W
LG
–
B
B–
R
B–R
1
3
4
6
2
5
ISC
VAL
VE
I1
ISC2
ISC4
ISC1
ISC3
# 40
# 50
M–REL
B–
R
B–
O
W
C–
3
B–
O
F
R
OM
IGN
IT
ION
CO
IL
ENGINE AND ECT ECU (A/T)
E 9
, E1 0
A
B
71
* 1 : W/ TRACTION CONTROL
* 2 : W/O TRACTION CONTROL
BK
I22
B12
5
1
2
3
4
M
2
1
A
21
DI
A
22
FPC
B
46
THG
B
44
THW
2
1
2
1
BT1
2
BT1
1
FPC
DI
E
FP
+B
B
L–Y
B–R
B–R
B–R
BR
BR
G
L–Y
B–R
W–B
G
B–
R
P
R–
G
P
R–
G
P
R–
G
G
W–
B
G
W–
B
W
–
B
B–
R
G
E
G
R
G
AS
T
EM
P.
SEN
SO
R
(FO
R
C
A
L
IF
O
R
N
IA
)
E
F
I
W
AT
ER
T
E
M
P.
SE
N
SO
R
ENGINE ECU (M/T)
FUEL PUMP ECU
FUEL PUMP
F15
F16
E11
, E1 2
E3
E4
A
B
IJ1
8
IJ1
14
2
1
1
2
1
1H
4
1K
10
4
4
4
IJ1
11
1
1
EC
ED
E18
E20
I32
I33
B
49
B
50
B
26
B
27
B
7
B
25
B
80
B
79
A
15
B
75
B
74
B
39
R–Y
R–Y
B–R
BR
W–
B
W–
B
BR
W
W
R
Y
B
L
G
L–R
G–
R
G–
B
B–
W
B–
R
B–
R
B–
R
B–
R
B–
R
2
(*2
)
(*2
)
(*1
)
(*1
)
VS
V
(FO
R
E
G
R
)
VS
V
(F
O
R
EVA
P
)
VS
V
(FO
R
IN
TA
K
E
C
O
NT
RO
L
V
A
L
V
E
)
V1
V2
V3
10A
MIR
HTR
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
(F
O
R
U
S
A
SP
EC
.
)(
F
O
R
U
SA
SPE
C
.
)
(SH
IE
L
D
E
D
)
(SH
IE
L
D
E
D
)
KN
O
C
K
S
EN
S
O
R
N
O
.
2
(ON
R
E
A
R
S
ID
E
)
KN
O
C
K
S
EN
S
O
R
N
O
.
1
(ON
F
R
ON
T
S
ID
E
)
K1
K2
(SH
IE
L
D
ED
)
2
3
4
1
KNK1
KNK2
G1
G2
G–
NE
G1
G2
G–
NE
B
EO1
EO2
DISTRIBUTOR
D13
EGR
EVAP
ACIS
ELS
15A
TAIL
ENGINE AND ECT ECU (A/T)
E 9
, E1 0
A
B
2
1
3
B–R
B–R
DIODE
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