Lexus ES300 (2002 year). Manual — part 49
70
Engine Control
10A
ETCS
From Power Source System (See Page 56)
1B
2
IL2
1
B
6
E
8
E
9
E
23
E
7
E
6
C
4
D
7
D
6
A
26
A
22
A
28
A
27
A
23
A
29
C
16
C
15
EE
I 6
E 2
E 2
E 2
E 2
E 2
E
10
11 E
E
12
13 E
3
2
3
2
3
2
3
2
3
2
3
2
L–
R
L–
R
R–
W
P
LG
–B
L–Y
G–
R
L
W–
R
W
–
R
W–
R
W–
R
W–
R
W–
R
W–
R
Ignition Coil
and Igniter No. 1
I 1
Ignition Coil
and Igniter No. 2
I 2
Ignition Coil
and Igniter No. 3
I 3
Ignition Coil
and Igniter No. 4
I 4
Ignition Coil
and Igniter No. 5
I 5
Ignition Coil
and Igniter No. 6
I 6
2
1
BR
BR
E01
E02
ME01
E04
E05
VCPA
VPA
EPA
VCP2
VPA2
EPA2
OC1+
OC1–
W–
B
W–
B
W–
B
W–
B
W–
B
R
L–
Y
LG
–B
B–
R
W–
R
LG
G–
B
G–
R
W–
B
W–
B
W–
B
W–
B
+BM
IGT1
IGT2
IGT3
IGT4
IGT5
IGT6
IGF
6
5
3
4
2
1
W–R
W–R
W–R
W–R
Accelerator Pedal Position Sensor
A25
V
V
T
S
o
lenoi
d R
H
V1
0
Engine Control Module
E 6(A), E 7(B), E 8(C), E 9(D), E10(E)
VCP1
VPA1
EP1
VCP2
VPA2
EP2
W
W
IGT
IGF
IGT
IGF
IGT
IGF
IGT
IGF
IGT
IGF
IGT
IGF
1H
4
1K
9
L–
R
71
IF7
2
IF4
17
IF4
18
IF4
16
IF7
6
IK1
6
A
19
A
11
A
18
A
5
A
12
B
14
B
17
B
15
B
27
B
26
B
16
B
34
C
8
B
3
CODE
RXCK
TXCT
Y–G
B–O
V–W
G–R
W
P–B
R
G–
W
R–
L
L–
Y
V
L
G–
W
L–W
V–
W
G–
R
Y–
G
B–
O
W
P–
B
R
4
3
5
Transponder Key
Computer
I13
1
IF4
22
IF4
7
IF4
8
IF4
9
IF4
10
IK1
3
IK1
8
IF4
4
3B
3B
98
118
3B
3B
58
78
(*2)
(*3)
3B
3B
78
98
B
1
A
15
B
33
B
31
A
31
A
25
A
30
A
24
A
17
C
10
B
26
C
9
C
18
C
11
C
20
P
o
w
e
r S
teer
ing
O
il
Pr
e
s
s
u
re
SW
P 3
Skid Control ECU
S 6(B), S 7(C)
R–
W
BR
–
W
W
B
G
L
P–
L
B
BR
BR
BR
BR
–
W
W
B
G
L
P–
L
B
BR
BR
IL1
16
PS
NEO
ENG+
ENG–
TRC+
TRC–
A/CS
A/CI
EOM
HP
CODE
RXCK
TXCK
IMLD
KSW
CF
ACMG
SPD
W
THWO
TACH
SIL
TC
WFSE
NEO
ENG+
ENG–
TRC+
TRC–
Engine Control Module
* 2 : w/ VSC
* 3 : w/o VSC
A
/C
C
ont
ro
l
A
sse
m
b
ly
Un
lo
c
k
W
a
rn
ing S
W
F
A
N NO
. 1
Re
la
y
D
iode
(A/
C
)
W
(*2)
A/CS
A/CI
(*3)
3B
3B
109
129
2
7
A/C Control Assembly
A14
C
14
C
13
1
2
OC2+
OC2–
L–R
L–
W
V
V
T
S
o
lenoi
d LH
V 9
W
W
E 6(A), E 7(B), E 8(C), E 9(D), E10(E)
IK1
1
B
32
6
THR
Y–
B
Y–
B
AC1
72
Engine Control
2M
1
7. 5A
OBD
From Power Source System (See Page 56)
2A
4
IA
ID
3B
3B
71
91
3B
3B
32
52
3B
3B
51
71
3B
3B
52
72
A
40
A
33
B
2
A
11
A
31
A
21
Combination Meter
C 7(A), C 8(B)
3B
3B
64
84
3B
3B
60
80
3B
3B
54
74
(*2)
(*3)
3B
3B
50
70
2L
8
2R
8
W–
B
W
BR
W–
B
S
B
BR
SG
CG
Y–G
B–O
V–W
G–R
W
P–B
R
P–
B
W
W
W
W
WW
B
15
13
7
16
5
4
Data Link
Connector 3
D 2
* 2 : w/ VSC
* 3 : w/o VSC
WFSE
TC
SIL
BAT
(*3)
(*2)
10A
GAUGE1
(* 2)
(* 3)
(* 2)
(* 3)
BR
3A
82
3A
87
3A
92
3A
57
3B
3B
79
99
3B
3B
106
126
3B
3B
69
89
3B
3B
86
106
(*3)
(*2)
(*2)
(*3)
(* 2)
(* 3)
(* 2)
(* 3)
A
39
W
S
pee
dom
e
ter
G–
R
Ma
lfunc
ti
on
Indi
c
a
to
r La
m
p
Power
V–
W
Y–
G
B–
O
W
T
a
ch
om
et
er
Micro Computer
73
This system utilizes an engine control module and maintains overall control of the engine, transmission and so on. An outline
of the engine control is explained here.
1. Input Signals
(1) Engine coolant temp. signal circuit
The engine coolant temp. sensor detects the engine coolant temp. and has a built–in thermistor with a resistance which
varies according to the water temp. is input into TERMINAL THW of the engine control module as a control signal.
(2) Intake air temp. signal circuit
The intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp., which is input as a
control signal into TERMINAL THA of the engine control module.
(3) Oxygen sensor signal circuit
The oxygen density in the exhaust gases is detected and input as a control signal into TERMINALS OX1B and OX2B of
the engine control module. To maintain stable detection performance by the heated oxygen sensor, a heater is used for
warming the sensor. The heater is also controlled by the engine control module (HT1B and HT2B).
(4) RPM signal circuit
Camshaft position and crankshaft position are detected by the VVT sensor RH and crankshaft position sensor. The
camshaft position is input as a control signal to TERMINAL VV1+ of the engine control module, and the engine RPM is
input into TERMINAL NE+.
(5) Throttle signal circuit
The throttle position sensor detects the throttle valve opening angle as a control signal, which is input into TERMINAL
VTA1 of the engine control module.
(6) Vehicle speed signal circuit
The vehicle speed sensor, detects the vehicle speed and input to ABS speed sensor of the skid control ECU (w/ VSC)
or skid control ECU with actuator (w/o VSC), from skid control ECU to TERMINAL SPD of the engine control module, Via
combinatio meter.
(7) Park/Neutral position SW signal circuit
The Park/Neutral position SW detects whether the shift position is in neutral, parking or not, and inputs a control signal
into TERMINAL NSW of the engine control module.
(8) A/C SW signal circuit
The A/C control assembly inputs the A/C operations into TERMINAL A/CS of the engine control module as a control
signal.
(9) Battery signal circuit
Voltage is always supplies to TERMINAL BATT of the engine control module.
If you turn on the ignition SW, the current goes from TERMINAL MREL of the engine control module to the EFI relay and
put on the relay, and the voltage related to the engine control module operation is supplied to TERMINAL +B of the
engine control module through the EFI relay.
(10) Intake air volume signal circuit
Intake air volume is detected by the mass air flow meter and a signal is input into TERMINAL VG of the engine control
module as a control signal.
(11) Starter signal circuit
To confirm whether the engine is cranking, the voltage applied to the starter motor during cranking is detected and the
signal is input into TERMINAL STA of the engine control module as a control signal.
(12) Engine knock signal circuit
Engine knocking is detected by the knock sensor No.1 and No.2, then the signals are input into TERMINALS KNKR and
KNKL of the engine control module as a control signal.
(13) Air fuel ratio signal circuit
The air fuel ratio is detected and input as a control signal into TERMINALS AFL+, AFR+ of the engine control module.
System Outline
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