LEXUS SC400 1991 Service Repair Manual

LEXUS SC400 1991 Service Repair Manual SC400 1991 LEXUS LEXUS https://www.carmanualsonline.info/img/36/57051/w960_57051-0.png LEXUS SC400 1991 Service Repair Manual
Trending: steering wheel adjustment, Throttle Position sensor, relay, width, oil level, radio antenna, height

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LEXUS SC400 1991  Service Repair Manual 
66
.
ENGINE CONTROL
THIS SYSTEM UTILIZES AN ECU AND MAINTAINS OVERALL CONTROL OF THE ENGINE, TRANSMISSION AND SO ON. AN OUTLINE O\
F
THE ENGINE CONTROL IS EXPLAINED HERE.
1. INPUT SIGNALS
(1) WATER T

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LEXUS SC400 1991  Service Repair Manual 
67
2. CONTROL SYSTEM
*EFI (ELECTRONIC FUEL INJECTION) SYSTEM
THE EFI SYSTEM MONITORS THE ENGINE CONDITION THROUGH THE SIGNALS INPUT FROM EACH SENSOR (IN\
PUT SIGNALS
FROM (1) TO (13) ETC.) TO THE ECU

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LEXUS SC400 1991  Service Repair Manual 
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±RW±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

Page 3904 of 4087

LEXUS SC400 1991  Service Repair Manual 
69
E2022 22
1H
12
2
22
22 1I
10
P
N
3
2
1 2
EB2
1
IE1
15 IJ2
7 IJ1
10 IK1 7
IK1
6
1J
3
1E12
31 23 132
1
4
52 I32
EB1
3 EB2 1
VCC OUT GNDY
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±

Page 3905 of 4087

LEXUS SC400 1991  Service Repair Manual 
70
ENGINE CONTROL
I22E18
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
1A 15 A13 A 14
54
12
IJ2
11
E

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LEXUS SC400 1991  Service Repair Manual 
71
*1 :W/TRACTIONCONTROL
* 2 : W/O TRACTION CONTROL
BK
I22 B12
5
1
2
34
M
21
A
21 DI
A
22 FPC B
46
THG B
44
THW
2 1
2
1
BT1
2BT1 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

Page 3907 of 4087

LEXUS SC400 1991  Service Repair Manual 
72
ENGINE CONTROL
VC
VTA
IDL
E2
2
134
12 34
E20 E18 E18
B
42
VTA2 B
63
IDL2 B
65
E2 B
64
IDL1 B
43
VTA1 B
41
VC B
45
THA B
66
KS
A
35 PS
B
47 OX2 5
THA KS VC
E2
BR BR
B±R
B±R
WGB
L±Y
B±R
BR
BR
BR

Page 3908 of 4087

LEXUS SC400 1991  Service Repair Manual 
73
* 1 : W/ CD PLAYER
* 3 : FOR USA SPEC. *2:W/OCDPLAYER
8 13 715 2
3411912 8 3
E20 I32
I32
IJ 1 1 IK1
3
IK1
4
IK1
5IK1 2
EB1
2II1 5
B
4 E11
B
69 E1
B
28 VF2
B
29 VF1
A
20 TE1
A
3 KD
A
17 TT
A
23
ACM

Page 3909 of 4087

LEXUS SC400 1991  Service Repair Manual 
74
ENGINE CONTROL
EFI MAIN RELAY2 ± 4: CLOSED WITH IGNITION SW AT  ON OR  ST POSITION
W 4  WATER TEMP. SENSOR
1 ± 2: APPROX.  16.2K  (±20 °C,  ±4°F)
: APPROX.  2.45K  (20 °C,  68°F)
: APPRO

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LEXUS SC400 1991  Service Repair Manual 
75
I 1  ISC VALVE
4, 6±5 : APPROX.  21.3
1, 3±2 : APPROX.  21.3
I 6, I 7, I 8, I 9, I10, I11  INJECTOR
1 ± 2 : APPROX.  13.8
O 8  OXYGEN SENSOR SUB (FOR USA SPEC.)
1 ± 2 : APPROX.  5.6�(20 °
Trending: water pump, diagram, air conditioning, engine coolant, turn signal, sunroof, set clock