Lexus ES300 (1997 year). Manual — part 617
S
L
IG
B
IC REGULATOR
B
G 1
, G 2
A
GENERATOR
B
3
B
1
B
2
A
1
2
7
4
6
AM2
AM1
ACC
IG1
IG2
ST2
E 2
D
1
F
1
F
2
B
2
A
1
C
1
A
10
W
B–
R
B–
G
W–
R
W
B–Y
B–R
B–
Y
B–
R–
L
Y
W
T
O
DA
Y
T
IM
E
RUN
NI
NG
LIG
H
T
R
E
LA
Y
(
MA
IN
)
F
U
SI
B
L
E
L
IN
K
B
L
O
C
K
C
F
6
, F
8
AD
, F
9
F
, F
1
1
CHA
RG
E
W
A
R
N
IN
G
L
IG
H
T
[C
O
M
B
.
M
E
T
E
R
]
B
C
7
, C
8
A
B–
R
B–
R
B
B
B–
G
Y
R–
L
Y
100A
ALT
BATTERY
FL MAIN
3. 0W
W
Y
R–
L
B–
G
EB2
6
IG2
4
IM2
4
IGNITION SW
I13
B–G
Y
(*2
)
(*2
)
(*2
Y
(*1
)
J
UNC
T
IO
N
CO
NNE
CT
O
R
B
J1
8
, J1
9
A
A
B
A
B
B
B
)
5A
I
G
N
1K
3
1T
8
R
10A
G
A
U
G
E
1K
1
1J
2
1K
2
1K
5
1B
5
1B
1
4
0
A AM
1
W–
R
1
2
3
0
A AM
2
5A
A
L
T
–
S
2L
4
2C
3
2A
1
64
CHARGING
* 2 : CANADA
* 1 : USA
X
X
X
1 0
X
X
2
X
X
1
1
1
2
1
1
2
3
X
2
4
X
6
7
B
B
(HINT : SEE PAGE 7)
B
B
(HINT : SEE PAGE 7)
I13
A
BLUE
C 7
B
C 8
A
F 6
B
BLACK
G 2
A
G 1
F
F11
C
F 8
A
BLACK
J18
B
BLACK
J19
1
D
F 9
65
G 2 B
GENERATOR
B 3–GROUND : 13.9–15.1 VOLTS WITH THE ENGINE RUNNING AT 2000 RPM AND 25
C (77
F)
13.5–14.3 VOLTS WITH THE ENGINE RUNNING AT 2000 RPM AND 115
C (239
F)
B 2–GROUND : 0–4 VOLTS WITH THE IGNITION SW AT ON POSITION AND ENGINE NOT RUNNING
SERVICE HINTS
: PARTS LOCATION
CODE
SEE PAGE
CODE
SEE PAGE
CODE
SEE PAGE
C 7
A
F 9
D
I13
C 8
B
F11
F
J18
A
F 6
A
G 1
A
J19
B
F 8
C
G 2
B
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE
SEE PAGE
JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B
1J
COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)
1K
(
)
1T
INSTRUMENT PANEL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)
2A
ENGINE ROOM MAIN WIRE AND ENGINE ROOM J/B (ENGINE COMPARTMENT LEFT)
2C
ENGINE ROOM MAIN WIRE AND ENGINE ROOM J/B (ENGINE COMPARTMENT LEFT)
2L
COWL WIRE AND ENGINE ROOM J/B (ENGINE COMPARTMENT LEFT)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE
SEE PAGE
JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EB2
COWL WIRE AND ENGINE ROOM MAIN WIRE (UNDER THE ENGINE ROOM J/B)
IG2
INSTRUMENT PANEL WIRE AND COWL WIRE (RIGHT SIDE OF INSTRUMENT PANEL J/B)
IN2
38
ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)
: SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
E 2
COWL WIRE
66
ENGINE CONTROL
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 SYSTEM
THE OXYGEN DENSITY IN THE EXHAUST GASES IS DETECTED AND INPUT AS A CONTROL SIGNAL INTO
TERMINALS OXL1, OXR1 AND OXS 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 (HTL, HTR AND HTS).
( 4) RPM SIGNAL SYSTEM
CAMSHAFT POSITION AND CRANKSHAFT POSITION ARE DETECTED BY THE CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR. THE CAMSHAFT POSITION IS INPUT AS A CONTROL SIGNAL TO TERMINAL
G22+ 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 SYSTEM
THE VEHICLE SPEED SENSOR, INSTALLED INSIDE THE TRANSMISSION, DETECTS THE VEHICLE SPEED AND
INPUTS A CONTROL SIGNAL INTO TERMINAL SPD OF THE ENGINE CONTROL MODULE.
( 7) PARK/NEUTRAL POSITION SW SIGNAL SYSTEM
THE PARK/NEUTRAL POSITION SW DETECTS WHETHER THE SHIFT POSITION IS IN NEUTRAL, PARKING OR
NOT, AND INPUTS A CONTROL SIGNAL INTO TERMINAL STA OF THE ENGINE CONTROL MODULE
( 8) A/C SW SIGNAL SYSTEM
THE A/C CONTROL ASSEMBLY INPUTS THE A/C OPERATIONS INTO TERMINAL A/C OF THE ENGINE CONTROL
MODULE AS A CONTROL SIGNAL.
( 9) BATTERY SIGNAL CIRCUIT
VOLTAGE IS CONSTANTLY APPLIED TO TERMINAL BATT OF THE ENGINE CONTROL MODULE. WHEN THE
IGNITION SW IS TURNED ON, VOLTAGE FOR THE ENGINE CONTROL MODULE OPERATION IS APPLIED TO
TERMINAL +B OF THE ENGINE CONTROL MODULE VIA 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) NSW 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 NSW OF THE ENGINE CONTROL MODULE
AS A CONTROL SIGNAL.
(12) ENGINE KNOCK SIGNAL CIRCUIT
ENGINE KNOCKING IS DETECTED BY THE KNOCK SENSOR 1 AND 2, THEN THE SIGNALS ARE INPUT INTO
TERMINALS KNKR AND KNKL OF THE ENGINE CONTROL MODULE AS A CONTROL SIGNAL.
SYSTEM OUTLINE
67
2. CONTROL SYSTEM
SFI (SEQUENTIAL MULTIPORT FUEL INJECTION) SYSTEM
THE SFI SYSTEM MONITORS THE ENGINE CONDITION THROUGH THE SIGNALS, WHICH ARE INPUT FROM EACH
SENSOR (INPUT SIGNALS (1) TO (12)). THE BEST FUEL INJECTION VOLUME IS DECIDED BASED ON THIS DATA
AND
THE PROGRAM MEMORIZED BY THE ENGINE CONTROL MODULE, AND THE CONTROL SIGNAL IS OUTPUT TO
TERMINALS #10, #20, #30, #40, #50, AND #60 OF THE ENGINE CONTROL MODULE TO OPERATE THE INJECTOR
(INJECT THE FUEL). THE SFI SYSTEM PRODUCES CONTROL OF FUEL INJECTION OPERATION BY THE ENGINE
CONTROL MODULE IN RESPONSE TO THE DRIVING CONDITIONS.
ESA (ELECTRONIC SPARK ADVANCE) SYSTEM
THE ESA SYSTEM MONITORS THE ENGINE CONDITION THROUGH THE SIGNALS, WHICH ARE INPUT TO THE
ENGINE CONTROL MODULE FROM EACH SENSOR (INPUT SIGNALS FROM 1, 3, 4, 12). THE BEST IGNITION TIMING
IS DECIDED ACCORDING TO THIS DATA AND THE MEMORIZED DATA IN THE ENGINE CONTROL MODULE AND
THE CONTROL SIGNAL IS OUTPUT TO TERMINALS IGT1, IGT2 AND IGT3. THIS SIGNAL CONTROLS THE IGNITER
TO PROVIDE THE BEST IGNITION TIMING FOR THE DRIVING CONDITIONS.
HEATED OXYGEN SENSOR HEATER CONTROL SYSTEM
THE HEATED OXYGEN SENSOR HEATER CONTROL SYSTEM TURNS THE HEATER ON WHEN THE INTAKE AIR
VOLUME IS LOW (TEMP. OF EXHAUST EMISSIONS IS LOW), AND WARMS UP THE HEATED OXYGEN SENSOR TO
IMPROVE DETECTION PERFORMANCE OF THE SENSOR. THE ENGINE CONTROL MODULE EVALUATES THE
SIGNALS FROM EACH SENSOR (INPUT SIGNALS FROM 1, 4, 9, 10), CURRENT IS OUTPUT TO TERMINALS HTL,
HTR AND HTS, CONTROLLING THE HEATER.
IDLE AIR CONTROL SYSTEM
THE IDLE AIR CONTROL SYSTEM (ROTARY SOLENOID TYPE) INCREASES THE RPM AND PROVIDES IDLE STABILITY
FOR FAST IDLE–UP WHEN THE ENGINE IS COLD, AND WHEN THE IDLE SPEED HAS DROPPED DUE TO ELECTRICAL
LOAD AND SO ON, THE ENGINE CONTROL MODULE EVALUATES THE SIGNALS FROM EACH SENSOR (INPUT
SIGNALS FROM 1, 4, 5, 8, 9), CURRENT IS OUTPUT TO TERMINALS RSO AND RSC TO CONTROL IDLE AIR CONTROL
VALVE.
EGR CONTROL SYSTEM
THE EGR CONTROL SYSTEM DETECTS THE SIGNAL FROM EACH SENSOR (INPUT SIGNALS FROM 1, 4, 9, 10),
AND OUTPUTS CURRENT TO TERMINAL EGR TO CONTROL THE VSV (EGR).
THE EGR VALVE POSITION SENSOR IS MOUNTED ON THE EGR VALVE. THIS SENSOR CONVERTS THE EGR VALVE
OPENING HEIGHT INTO A VOLTAGE AND SENDS IT TO THE ENGINE CONTROL MODULE AS THE EGR VALVE
POSITION SIGNAL.
ACIS (ACOUSTIC CONTROL INDUCTION SYSTEM)
ACIS INCLUDES A VALVE IN THE BULKHEAD SEPARATING THE SURGE TANK INTO TWO PARTS. THIS VALVE IS
OPENED AND CLOSED IN ACCORDANCE WITH THE DRIVING CONDITIONS TO CONTROL THE INTAKE MANIFOLD
LENGTH IN TWO STAGES FOR INCREASED ENGINE OUTPUT IN ALL RANGES FROM LOW TO HIGH SPEEDS.
THE ENGINE CONTROL MODULE JUDGES THE ENGINE SPEED BY THE SIGNALS ((4), (5)) FROM EACH SENSOR
AND OUTPUTS SIGNALS TO THE TERMINAL ACIS TO CONTROL THE VSV (INTAKE AIR CONTROL).
3. DIAGNOSIS SYSTEM
WITH THE DIAGNOSIS SYSTEM, WHEN THERE IS A MALFUNCTION IN THE ENGINE CONTROL MODULE SIGNAL
SYSTEM, THE MALFUNCTIONING SYSTEM IS RECORDED IN THE MEMORY.
4. FAIL–SAFE SYSTEM
WHEN A MALFUNCTION OCCURS IN ANY SYSTEMS, IF THERE IS A POSSIBILITY OF ENGINE TROUBLE BEING
CAUSED BY CONTINUED CONTROL BASED ON THE SIGNALS FROM THAT SYSTEM, THE FAIL–SAFE SYSTEM
EITHER CONTROLS THE SYSTEM BY USING DATA (STANDARD VALUES) RECORDED IN THE ENGINE CONTROL
MODULE MEMORY OR ELSE STOPS THE ENGINE.
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