Light TOYOTA CAMRY 1994 XV10 / 4.G Wiring Diagrams Owner's Manual

60
POWER SOURCE (Current Flow Chart)
*Page Nos. of
Related Systems
Parts
Code or
Location
CB or Fuse
Location
156
* These are the page numbers of the first page on which the related system is shown.
The part indicated is located somewhere in the system, not necessarily on the page indicated here.


P13 P14 P15 P16 R1 R2 R3 R5 R6 R7 R8 R9156 156126
222
224
228
234126
190154120
124
Power Window Motor Front LH
Power Window Motor Front RH
Power Window Motor Rear LH
(EX. C/P)
Radiator Fan Motor (5S±FE)
Radio and Player (w/ CD Player)
Radio and Player (w/o CD Player)
Rear Window Defogger SW
Remote Control mirror SW
Rheostat
Stop Light LH
[Rear Comb. Light LH]
Taillight LH
[Rear Comb. Light LH]
Rear Turn Signal Light LH
[Rear Comb. Light LH]
Stop Light LH
[Rear Comb. Light LH]
40A AM1
15A CIG/RADIO
40A DEFOG
15A ECU±1G
10A GAUGE
7.5A IGN
10A MIR±HTR
30A POWER
7.5A SRS
15A STOP
15A TAIL
7.5A TURN
20A WIPER
30A AM2
7.5A ALT±S
30A CDS FAN
20A DOME
15A ECU±B
15A EFI
10A HAZ
15A HEAD (LWR±LH)
15A HEAD (LWR±RH)
15A HEAD (UPR±LH)
15A HEAD (UPR±RH)
15A HEAD LH
15A HEAD RH
10A HORN
40A MAIN
7.5A OBD
10A STARTER
10A A/C
40A HEATER
7.5A DRL
100A ALT
60A ABSR10 R11 R16 R17
Power Window Motor Rear RH
(EX. C/P)
Taillight LH
[Rear Comb. Light LH]
Back±up Light LH
[Rear Comb. Light LH]
Stop Light RH
[Rear Comb. Light RH]
Taillight RH
[Rear Comb. Light RH]
Rear Turn Signal Light RH
[Rear Comb. Light RH]
Taillight RH
[Rear Comb. Light RH]
Stop Light RH
[Rear Comb. Light RH]
Back±up Light RH
[Rear Comb. Light RH]
Rear Window Defogger (+)
(EX. W/G)
Rear Window Defogger (±)
(EX. W/G)
Rear Window Defogger (±)
(W/G)
156 242 126 126144
14811 4
148120
124144
148152120
124144
14811 4
11 8144
148120
124152 190 190 190
[LOCATION](1)
(7): J/B No. 1 (See page 20)
: R/B No. 7 (See page )(2)
(8): J/B No. 2 (See page 19)
: Fuse Box (F10, F17 See
on page )(3): R/B No. 1 (See page 23)
2022
25
27
28 29

61
186
R18 R19 R20 R21 S3 S8 S9 S10 V1 V2 V3 V468
72182226
23080
90
98
Rear Wiper Motor (W/G)
Rear Wiper Relay (W/G)
Remote Control Mirror LH
Remote Control Mirror RH
Shift Lock ECU
Stereo Component Amplifier
Stereo Component Amplifier
Stop Light SW
VSV (for A/C Idle±Up)
VSV (for EGR System) (1MZ±FE)
VSV (for Fuel Pressure Up)
VSV (for Intake Air Control)
(1MZ±FE)
Vehicle Speed Sensor
(Speed Sensor)
Vanity Light LH
Vanity Light RH
Washer Motor
Water Temp. Sender
Diode
Noise Filter
Defogger Relay (Coil Side)
Power Main Relay (Coil Side)
S5 V5 V8 V9 W1 W2
Starter (1MZ±FE)
Defogger Relay (Point Side)
Power Main Relay (Point Side)
Taillight Relay (Coil Side)
Taillight Relay (Point Side)
Starter Relay (Point Side)
Starter Relay (Coil Side)
EFI Main Relay (Coil Side)
EFI Main Relay (Point Side)
Headlight Relay (Coil Side)
186 154 154226
230120
192
204182
198
210
21480
9080
90
9880 80
98
198 90
192
236130
134
138130
134
138184
186236130
134
138190 190 190156
160
168156
160
16811 2
12612668
7268
72 80
90
98
198
204 80
90
98
198
204106
(4): R/B No. 4 (See page 20)(5): R/B No. 5 (See page 19)(6)R/B No. 6 (See Page )
2526 26

62
POWER SOURCE (Current Flow Chart)
*Page Nos. of
Related Systems
Parts
Code or
Location
CB or Fuse
Location
* These are the page numbers of the first page on which the related system is shown.
The part indicated is located somewhere in the system, not necessarily on the page indicated here.


106
Horn Relay
Headlight Relay (Point Side)
Radiator Fan Relay (Point Side)
Turn Signal Flasher
Heater Relay (Point Side)
Radiator Fan Relay No. 2
(Coil Side)
A/C Magnetic Clutch Relay
(Coil Side)
Daytime Running Light Relay No. 3
(Coil Side)
40A AM1
15A CIG/RADIO
40A DEFOG
15A ECU±1G
10A GAUGE
7.5A IGN
10A MIR±HTR
30A POWER
7.5A SRS
15A STOP
15A TAIL
7.5A TURN
20A WIPER
30A AM2
7.5A ALT±S
30A CDS FAN
20A DOME
15A ECU±B
15A EFI
10A HAZ
15A HEAD (LWR±LH)
15A HEAD (LWR±RH)
15A HEAD (UPR±LH)
15A HEAD (UPR±RH)
15A HEAD LH
15A HEAD RH
10A HORN
40A MAIN
7.5A OBD
10A STARTER
10A A/C
40A HEATER
7.5A DRL
100A ALT
60A ABS
Radiator Fan Relay (Coil Side)
Heater Relay (Coil Side)
Radiator Fan Relay No. 2
(Point Side)
Radiator Fan Relay No. 3
(Point Side)
A/C Magnetic Clutch Relay
(Point Side)
Circuit Opening Relay (Coil Side)
Circuit Opening Relay (Coil Side)
Daytime Running Light Relay No. 4
(Coil Side)
106 173 106 242 24211 4
11 8246 246 242 242 242 246 24680
90
9880
90
98
[LOCATION](1)
(4): J/B No. 1 (See page 20)
: R/B No. 4 (See page )(2)
(5): J/B No. 2 (See page 19)
: R/B No. 5 (See page )(3)
(6): R/B No. 1 (See page 23)
: R/B No. 6 (See page )
(7): R/B No. 7 (See page 20)(8): Fuse Box (F10, F17 See
on page 19) 20 2225
25
28 2926 26
27

64

POWER SOURCE
5 512
3 W
W
W
W
W±R
B±R
W±B
W±R
W W
R±LW B±R L
W B60A ABS
100A ALT
DAYTIME RUNNING
LIGHT RELAY NO. 2(
CA NADA)
(
USA)
B
2H2
EC1 6
B
(
CANADA)
5
RW±B
FL MAIN
2. 0L
B
BATTERY
1
B
GENERATOR
(
ALTERNATOR) G1W
W
E14 : 1MZ±FE
E23 : 5S±FE
(
5S±FE)
(
1MZ±FE)
B 1A 1
D 1
C 1 E 1
TO AB S
ACTUATOR W±L
(
1MZ±FE)
(
5S±FE)
B F1 0 , F10
AC,F16
E F17D ,F18
FUSE B OX
W
(
5S±FE)(
5S±FE)
4 40A
HEATER
4 4
3 W
EF1 3IP37EF14
I2
E6
E14 : 1MZ±FE
E20 : 5S±FE
E14 : 1MZ±FE
E15 : 5S±FE
WW
W
W
WW
W
2 40A
AM1
1G 91E 1
1
3A 15
3C 16
2E2
2H215A HEAD(
RH)
15A HEAD(
LH)
15A HEAD(
UPR±RH)
15A HEAD(
UPR±LH)
2F 15
2 TER RELAY
2C2C
25
1
2E1 2G1 10A HAZ
20A DOME
AM2
15A EFI
40A MAIN
HEADLIGHT
RELAY
4
23
1 10A HORN 7. 5A ALT±S15A TEL
30A CDS FAN30A RDI FAN
543
W
2B6
2B2W±B
W±B 2G6
B±R
2H 1
15A ECU±B
ENGINE
MAIN RELAY 21
7. 5A OBD
30A
STAR3
B

65
E7 E6
21
7521
12 1E4
1E2
1G10
1G3
1G8 4
103
2
7
9 AM2 AM1ACC
IG1
ST1
IG2
ST2
EB IG 5
5 11M1
1C10 W
W
W
W±R
W±B
B±R
WB±R
B±R
WW
W
WW±B W
W
P±L
B±Y
B±O B±W
W
W±B
W±B
15A STOP
7. 5A SRS
15A TAIL
TAILLIGHT
RE LA Y
POWER MAIN
RELAY
DEFOGGER
RE LA Y
15A CIG/RADIO
15A ECU±IG
20A WIPER
10A GAUGE
7. 5A TURN
15A HEAD(
LW R±RH)
15A HEAD(
LWR±LH)
7. 5A DRL B±R
TO STARTER
3412 53
12
53
53
W±B
IGNITION SW I12
7 5R±W
R
W±R 1A7
EB11TO DOOR LOCK
CONTROL RELAY
10A MIR HTR
7. 5A IGN
10A STARTER
54 B±R
IP1172130A POWER
1240A DEFOG
E10 : 1MZ±FE
E20 : 5S±FE

66
POWER SOURCE
TAILLIGHT RELAY5±3 : CLOSED WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION
CLOSED WITH ENGINE RUNNING AND PARKING BRAKE LEVER RELEASED (CANADA)
ENGINE MAIN RELAY4±5 : CLOSED WITH IGNITION SW AT ON OR ST POSITIONHEADLIGHT RELAY2±1 : CLOSED WITH LIGHT CONTROL SW AT HEAD POSITION OR DIMMER SW AT FLASH POSITION
CLOSED WITH ENGINE RUNNING AND PARKING BRAKE LEVER RELEASED (CANADA)
I12
IGNITION SW 4±3 : CLOSED WITH IGNITION KEY AT ACC OR ON POSITION
10±9, 4±2 : CLOSED WITH IGNITION KEY AT ON OR ST POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
F10A28F17E28 (1MZ±FE), 30 (5S±FE)I 233F10B30F18D28 (1MZ±FE), 30 (5S±FE)
F16C28 (1MZ±FE), 30 (5S±FE)G 128 (1MZ±FE), 30 (5S±FE)
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
125R/B NO. 4 (LEFT KICK PANEL)
425R/B NO. 4 (RIGHT KICK PANEL)
526R/B NO. 5 (ENGINE COMPARTMENT LEFT)
727R/B NO. 7 (NEAR THE BATTERY)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A
1C
1E20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
1G
20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
1M
2B22ENGINE ROOM MAIN WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
2C22ENGINE WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
2E22ENGINE ROOM MAIN WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
2F22COWL WIRE AND J/B NO 2 (ENGINE COMPARTMENT LEFT)2G22COWL WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
2H22ENGINE WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
3A24COWL WIRE AND J/B NO 3 (BEHIND COMBINATION METER)3C24COWL WIRE AND J/B NO. 3 (BEHIND COMBINATION METER)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EB138 (1MZ±FE)ENGINE ROOM MAIN WIRE AND RELAY WIREEB140 (5S±FE)ENGINE ROOM MAIN WIRE AND RELAY WIRE
EC138 (1MZ±FE)ENGINE WIRE AND ENGINE ROOM MAIN WIREEC140 (5S±FE)ENGINE WIRE AND ENGINE ROOM MAIN WIRE
EF138 (1MZ±FE)EF140 (5S±FE)ENGINE WIRE AND COWL WIREIP144
ENGINE WIRE AND COWL WIRE
IP344
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EB38 (1MZ±FE)FRONT LEFT FENDEREB40 (5S±FE)FRONT LEFT FENDER
IG42INSTRUMENT PANEL BRACE LH
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E638 (1MZ±FE)E1438 (1MZ±FE)E 640 (5S±FE)ENGINE ROOM MAIN WIREE15ENGINE WIRE
E738 (1MZ±FE)ENGINE ROOM MAIN WIREE2040 (5S±FE)ENGINE WIRE
E 740 (5S±FE)E23
40 (5S FE)
E1038 (1MZ±FE)ENGINE WIREI 244COWL WIRE
SERVICE HINTS

76
CHARGING
A
IG L S B
IC RE GULATOR2C 6
B 2B1B3 8
E9
E
IP3 10 IP 3 2GE 64)
A 1 7. 5A
ALT±S
R±LY
W
R±L
YB±O
W B
W
W
GENERATOR
(
ALTERNATOR)
BATTERY FL MAIN
2. 0L
100A ALT
CHARGE WARNING LIGHT
[COMB. METER]
JUNCTION
CONNECTOR
Y
J1
G1 , G2
C9
B FUSE BOX
FROM DAYTIME RUNNING
LIGHT RELAY(
MAIN)
Y E
(
CANADA)
R±L R±L
TO BA CK± UP SW(
M/T)
TO PARK/NEUTRAL POSITION
SW(
NEUTRAL START SW)(
A/T)
TO VEHICLE SPEED SENSOR
(
SPEED SENSOR) B 1A 1
C 1(
1MZ±FE)
(
5S±FE)
B F10 , F10AC,F16
I18
1D 61D37. 5A
IGN 10A
GAUGE
FROM POWER SOURCE SYSTEM(
SEE PA

83
AB
A
EC 1 C 5
TE 1D 11
TE2
B 14KNKL
B 16G22+
B 5NE +
EE1 4EE12
1 1
BR
B
B±O
L±B
BR GR±B
WB
B±W
R R B±W
3 1 12 19
8FP +B IG±
SG
TE 2 TE 1 DATA LINK CONNECTOR
1(
CHECK CONNECTOR) D1
V5
CRANKSHAFT POSITION
SENSOR C18KNOCK SENSOR 2 K2
CAMSHAFT POSITION
SENSOR C17
C 3
G±R
6B 3
G±R
A
W
(
SHIELDED) (
SHIELDED)
D 12FROM POWER SOURCE SYSTEM(
SEE PAGE 64)
C CIP3 2
IP2 11 IP2141
23
4 512 SP1G±B
GLGP
R±LR±L
R±L
VEHICLE SPEED
SENSOR
(
SPEED SENSOR)
B
MALFUNCTION INDICATOR LAMP
(
CHECK ENGINE WARNING LIGHT)
[COMB. METER] C9 , C10
SPEED
JUNCTION
CONNECTOR J2 COMBINATION
METER C8
D
E NG INE CO NTROL MODULE(
ENGINE AND ELECTRONIC
CONTROLLED TRANSMISSION ECU) E7 , E8 ,E9 ,E10C
E142 1
NOISE FILTER
(
FOR IGNITION
SYSTEM) W±B
W±B B±O
W±B
N1
V±Y
ED B±OR±L
R±L B
I23
D 28
SDL DA TA LINK
CO NNE CTOR 3 D24 FROM POWER
SO TEM
(
S)
.5A
OBD
DA TA LINK
CO NNE CTO R
2(
TDCL) D3
IP3 16 IP1 1
22I18 I18B 6NE±
C E1
I18 IM12
J1
J UNCTION CO NNE CTO R
IE JUNCTION
CONNECTOR J7
L
G
BR
V±Y L
G
V±Y
BR BR W±B
W±B
BR
BR
BR BR BR BR
G (
SHIELDED)
(
SHIELDED)
(
SHIELDED)
(
SHIELDED)
A
A
A
AA
A
A
A
A
A
A
BR
BR
BR
BR
BR
W±B BR
BR
BRBR
(
SHIELDED)
(
SHIELDED) BR BR
BR
BR BR W±B
F F
24 15
2 45
G± WBR W±B
L±B
B±O
BR
BR
BR
BR BB G±W
W3
E1
OX1
SDL
16W±BE1
CG
OX2
BATT(
SHIELDED)
(
SHIELDED) BR
(
SHIELDED)
(
SHIELDED)
(
SHIELDED)
(
SHIELDED)
16 B 17G22±IP1 19
G±R
10A
GAUGE
1B 616
R± L
D
3D 3
3D 12
3D 183D 7
3D 3
3D 22
3D 10
1M5
1C8
URCE SYS
EE PAGE 64
7

88
ENGINE CONTROL (5S±FE)
THIS SYSTEM UTILIZES AN ENGINE CONTROL MODULE (ENGINE ECU (M/T), ENGINE AND ELECTRONIC CONTROLLED
TRANSMISSION ECU (A/T)) 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. (WATER TEMP.) SIGNAL SYSTEM
THE ENGINE COOLANT TEMP. SENSOR (EFI WATER TEMP. SENSOR) DETECTS THE ENGINE COOLANT TEMP. AND HAS A
BUILT±IN THERMISTOR WITH A RESISTANCE WHICH VARIES ACCORDING TO THE ENGINE COOLANT TEMP. (WATER TEMP.)
THUS THE ENGINE COOLANT TEMP. (WATER TEMP.) IS INPUT IN THE FORM OF A CONTROL SIGNAL TO TERMINAL THW OF
THE ENGINE CONTROL MODULE (ECU).
(2) INTAKE AIR TEMP. SIGNAL SYSTEM
THE INTAKE AIR TEMP. SENSOR (IN±AIR TEMP. SENSOR) IS DETECTS THE INTAKE AIR TEMP., WHICH IS INPUT AS A
CONTROL SIGNAL TO TERMINAL THA OF THE ENGINE CONTROL MODULE (ECU).
(3) OXYGEN SENSOR SIGNAL SYSTEM
THE OXYGEN DENSITY IN THE EXHAUST GASES IS DETECTED AND INPUT AS A CONTROL SIGNAL TO TERMINAL OX1 AND
OX2 OF THE ENGINE CONTROL MODULE (ECU).
(4) RPM SIGNAL SYSTEM
CRANKSHAFT POSITION AND ENGINE RPM ARE DETECTED BY THE PICK±UP COIL INSTALLED INSIDE THE DISTRIBUTOR.
CRANKSHAFT POSITION IS INPUT AS A CONTROL SIGNAL TO TERMINALS G+ AND G2 (CALIFORNIA), OF THE ENGINE
CONTROL MODULE (ECU), AND RPM IS INPUT TO TERMINAL NE+.
(5) THROTTLE SIGNAL SYSTEM
THE THROTTLE POSITION SENSOR DETECTS THE THROTTLE VALVE OPENING ANGLE, WHICH IS INPUT AS A CONTROL
SIGNAL TO TERMINAL VTA OF THE ENGINE CONTROL MODULE (ECU), OR WHEN THE VALVE IS FULLY CLOSED, TO
TERMINAL IDL
(6) VEHICLE SPEED SIGNAL SYSTEM
THE VEHICLE SPEED SENSOR (SPEED SENSOR), INSTALLED INSIDE THE COMBINATION METER, DETECTS THE VEHICLE
SPEED AND INPUTS A CONTROL SIGNAL TO TERMINAL SPD OF THE ENGINE CONTROL MODULE (ECU).
(7) PARK/NEUTRAL POSITION SW (NEUTRAL START SW) SIGNAL SYSTEM (A/T)
THE PARK/NEUTRAL POSITION SW (NEUTRAL START SW) DETECTS WHETHER THE SHIFT POSITION ARE IN NEUTRAL AND
PARKING OR NOT, AND INPUTS A CONTROL SIGNAL TO TERMINAL NSW OF THE ENGINE CONTROL MODULE (ECU).
(8) A/C SW SIGNAL SYSTEM
THE A/C AMPLIFIER INPUTS THE A/C OPERATIONS TO TARMINAL ACA OF THE ENGINE CONTROL MODULE (ECU) AS A
CONTROL SIGNAL.
(9) BATTERY SIGNAL CIRCUIT
VOLTAGE IS CONSTANTLY APPLIED TO TERMINAL BATT OF THE ENGINE CONTROL MODULE (ECU). WHEN THE IGNITION SW
TURNED ON, THE VOLTAGE FOR ENGINE CONTROL MODULE (ECU) START±UP POWER SUPPLY IS APPLIED TO TERMINALS
+B AND +B1 OF ENGINE CONTROL MODULE (ECU) VIA EFI MAIN RELAY. THE CURRENT FLOWING THROUGH THE IGN FUSE
FLOWS TO TERMINAL IGSW OF THE ENGINE CONTROL MODULE (ECU).
(10) INTAKE AIR VOLUME SIGNAL SYSTEM
INTAKE AIR VOLUME IS DETECTED BY THE MANIFOLD ABSOLUTE PRESSURE SENSOR (VACUUM SENSOR) (FOR MANIFOLD
PRESSURE) AND IS INPUT AS A CONTROL SIGNAL TO TERMINAL PIM OF THE ENGINE CONTROL MODULE (ECU).
(11) STA 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 (ECU) AS A CONTROL
SIGNAL.
(12) ENGINE KNOCK SIGNAL CIRCUIT
ENGINE KNOCKING IS DETECTED BY KNOCK SENSOR AND THE SIGNAL IS INPUT INTO TERMINAL KNK AS A CONTROL
SIGNAL.
(13) ELECTRICAL LOAD SIGNAL SYSTEM
THE SIGNAL WHEN SYSTEMS SUCH AS THE REAR WINDOW DEFOGGER, HEADLIGHTS, ETC. WHICH CAUSE A HIGH
ELECTRICAL BURDEN ARE ON IS INPUT TO TERMINAL ELS AS A CONTROL SIGNAL.
SYSTEM OUTLINE

89
2. CONTROL SYSTEM
*MFI (MULTIPORT FUEL INJECTION (EFI)) SYSTEM
THE MFI (EFI) SYSTEM MONITORS THE ENGINE CONDITION THROUGH THE SIGNALS INPUT FROM EACH SENSOR (INPUT
SIGNALS FROM (1) TO (13) ETC.) TO THE ENGINE CONTROL MODULE (ECU). THE BEST FUEL INJECTION VOLUME IS DECIDED
BASED ON THIS DATA AND THE PROGRAM MEMORIZED BY THE ENGINE CONTROL MODULE (ECU), AND THE CONTROL SIGNAL
IS OUTPUT TO TERMINALS #10, #20, #30 AND #40 (CALIFORNIA), TERMINALS #10 AND #20 (EX. CALIFORNIA) OF THE ENGINE
CONTROL MODULE (ECU) TO OPERATE THE INJECTOR. (INJECT THE FUEL). THE MFI (EFI) SYSTEM PRODUCES CONTROL OF
FUEL INJECTION OPERATION BY THE ENGINE CONTROL MODULE (ECU) IN RESPONSE TO THE DRIVING CONDITIONS.
*ESA (ELECTRONIC SPARK ADVANCE) SYSTEM
THE ESA SYSTEM MONITORS THE ENGINE CONDITION THROUGH THE SIGNALS INPUT TO THE ENGINE CONTROL MODULE (ECU)
FROM EACH SENSOR (INPUT SIGNALS FROM (1), (2), (4) TO (12) ETC.) THE BEST IGNITION TIMING IS DETECTED ACCORDING TO
THIS DATA AND THE MEMORIZED DATA IN THE ENGINE CONTROL MODULE (ECU) AND THE CONTROL SIGNAL IS OUTPUT TO
TERMINAL IGT. THIS SIGNAL CONTROLS THE IGNITER TO PROVIDE THE BEST IGNITION TIMING FOR THE DRIVING CONDITIONS.
*IAC (IDLE AIR CONTROL (ISC)) SYSTEM
THE IAC (ISC) SYSTEM (ROTARY SOLENOID TYPE) INCREASES THE RPM AND PROVIDES IDLING STABILITY FOR FAST IDLE±UP
WHEN THE ENGINE IS COLD AND WHEN THE IDLE SPEED HAS DROPPED DUE TO ELECTRICAL LOAD, ETC. THE ENGINE
CONTROL MODULE (ECU) EVALUATES THE SIGNALS FROM EACH SENSOR (INPUT SIGNALS (1), (4) TO (8), (13) ETC.), OUTPUTS
CURRENT TO TERMINALS ISCO AND ISCC, AND CONTROLS THE IDLE AIR CONTROL VALVE (ISC VALVE).
*FUEL PUMP CONTROL SYSTEM
THE ENGINE CONTROL MODULE (ECU) OPERATION OUTPUTS TO TERMINAL FC AND CONTROLS THE CIRCUIT OPENING RELAY
AND THUS CONTROLS THE FUEL PUMP DRIVE SPEED IN RESPONSE TO CONDITIONS.
*A/C IDLE±UP SYSTEM
IN ORDER TO PREVENT THE ENGINE IDLING SPEED FROM DROPPING WHEN THE A/C IS OPERATING, THE A/C IDLE±UP SYSTEM
CONTROLS THE VSV (FOR A/C IDLE±UP) TO INCREASE THE ENGINE IDLING SPEED AND KEEP IT STABLE.
*EGR CONTROL SYSTEM
THE EGR CUT CONTROL SYSTEM CONTROLS THE VSV (FOR EGR) BY EVALUATING THE SIGNALS FROM EACH SENSOR INPUT TO
THE ENGINE CONTROL MODULE (ECU) (INPUT SIGNALS (1), (5), (6), (9) ETC.) AND BY SENDING OUTPUT TO TERMINAL THG OF
THE ENGINE CONTROL MODULE (ECU).
*A/C CUT CONTROL SYSTEM
WHEN THE VEHICLE SUDDENLY ACCELERATES FROM LOW ENGINE SPEED, THIS SYSTEM CUTS OFF AIR CONDITIONING
OPERATION FOR A FIXED PERIOD OF TIME IN RESPONSE TO THE VEHICLE SPEED AND THROTTLE VALVE OPENING ANGLE IN
ORDER TO MAINTAIN ACCELERATION PERFORMANCE.
THE ENGINE CONTROL MODULE (ECU) RECEIVES INPUT SIGNALS ((5), (6) ETC.), AND OUTPUTS SIGNALS TO TERMINAL ACT.
3. DIAGNOSIS SYSTEM
WITH THE DIAGNOSIS SYSTEM, WHEN THERE IS A MALFUNCTIONING IN THE ENGINE CONTROL MODULE (ECU) SIGNAL SYSTEM,
THE MALFUNCTION SYSTEM IS RECORDED IN THE MEMORY. THE MALFUNCTIONING SYSTEM CAN THEN BE FOUND BY READING
THE DISPLAY (CODE) OF THE MALFUNCTION INDICATOR LAMP (CHECK ENGINE WARNING LIGHT).
4. FAIL±SAFE SYSTEM
WHEN A MALFUNCTION OCCURS IN ANY SYSTEM, 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 (ECU) MEMORY OR ELSE STOPS THE
ENGINE.