1991 LEXUS SC400 Throttle Position sensor

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Page 3869 of 4087

LEXUS SC400 1991  Service Repair Manual 
27
Position of Parts in Engine Compartment
I 1 ISC Valve S 3Speed Sensor No. 1
I 2 Igniter S 4 Speed Sensor No. 2 (for ECT)
I 4 Ignition Coil S 6 Starter
I 6 Injector No. 1 S 7 Starter
I 7 Injector N

Page 3894 of 4087

LEXUS SC400 1991  Service Repair Manual 
127
2 1
2
1
E18 E20
E20 I32
I32
B
27 B
4B 28 A20 B 29
B
42 B 63 B 41 B43 B64 B65 B 44 B 23 B3
ED
E18
L±R
Y±L
R±B
BR
L±R Y
R BR
BR
Y±L
R±B
L±R Y
R
BR
G
P
V
GR±Y LG
B±Y BR
LG
BR
W±B
BR L
LG
G

Page 3897 of 4087

LEXUS SC400 1991  Service Repair Manual 
130
ECT AND A/T INDICATOR
THIS SYSTEM, ELECTRICALLY CONTROLS THE LINE PRESSURE, THROTTLE PRESSURE, LOCK±UP PRESSURE AND\
 ACCUMULATOR
PRESSURE ETC. THROUGH THE SOLENOID VALVE. THE ECT IS A SYSTEM WH

Page 3898 of 4087

LEXUS SC400 1991  Service Repair Manual 
131
E 1  ECT SOLENOID
1±4 :  APPROX.  5.3
2±5 :  APPROX.  3.7
3±GROUND : APPROX.  13.2
6±GROUND : APPROX.  13.2
E 2  EFI WATER TEMP. SENSOR
1±2 : APPROX.  16.2K  ( ±20 °C  ±4 °F)
APPROX

Page 3901 of 4087

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

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 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

Page 3910 of 4087

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 °