ECU TOYOTA CAMRY 1994 XV10 / 4.G Wiring Diagrams Repair Manual

220
ELECTRIC TENSION REDUCER
1 2
1 2 1 2
1 2IS 1 3
BLTE NSI ON
RE DUCER
SOLENOID LHTENSION
REDUCER
SOLENOID RH
BUCKLE
SW LHBUCKLE
SW RH FROM POWE
R
GB±RB±R W±B
B7,B8 B10T3 T2B±R
B±R
IJ1 1
B±R
2 1
R±Y
D25
DIODE
(
FOR TENSION REDUCER)
W±B
15A
ECU±IG R SOURCE SYSTEM(
SEE PAGE 64)
1A 7
3A14
3D 53C 16

222
AUTO ANTENNA (S/D, C/P)*
1 : 6 SPEAKER
* 2 : 4 SPEAKER
W±B
AUTO ANTENNA MOTOR
AND CONTROL RELAY
BM A2 1M 145786 256431
R
2G 2
IU1 3 A A
R R R
JUNCTION
CONNECTOR J33
8
1OFF
B±R
L±R
RA DIO AND PLA YER(
*1)
RADIO SW
PLAYER
SW ON
B±R
P±L
II2 9 II2 13
IU1 1IU12
IU1 9IU110IM28
3
8
9OFF RADIO SW
PLAYER
SW ON 9
BB B
L±RB±R
L±R B±R
L±R
GR
W P±L B±R L±R B±R
P±L B±RGRR B±R FROM POWER S OURCE SY STE M(
SEE PAGE 64)
ACC
J UNCTION
CONNECTORSTEREO COMPONENT
AMPLIFIER
RA DIO AND PLA YER(
*2)
(
*2) (
*2)
(
*1) (
*1)
J3S8
R2
R3
L±Y
Y
R±G
B
R±W
W±B
23
LB 20A
DOME
W±B IM2 9 II2 3
R
1L 11L9 15A
ECU±IG15A
CIG/RADIO
1K 121C 1

224
AUTO ANTENNA (W/G)*
1 : 8 SPEAKER
* 2 : 6 SPEAKER
W±B
AUTO ANTENNA MOTOR
AND RELAY
BL A2 1
M 145786 256431
RR R
3
8
1OFF
B±R
L±R
RADIO A ND P LAY ER(
*1)
RADIO S W
PLAYER
SW ON
B±R
P±L
II2 9 II2 13
IG1 1IG12
IG1 9IG110IM28
3
8
9OFF RADIO S W
PLAYER
SW ON 9
BB B
L±RB±R
L±R B±R
L±R
GR
W P±L B±R L±R B±R
P±L B±RGR RB±R ACC
JUNCTION
CONNE CTORSTEREO COMPONENT
AMPLIFIER
RADIO A ND P LAY ER(
*2)
(
*2) (
*2)
(
*1) (
*1)
J3S8
R2
R3
L±Y
Y
R±G
B
R±W
W±B
23
LBW±B IM2 9
C C
JUNCTION
CONNECTOR J5
1H 61C 1
2G 21L11L9 FROM POWER SOURCE SYSTEM(
SEE PAGE 64)
15A
ECU±IG15A
CIG/RA DIO 20A
DOME

236
COMBINATION METER
AB
IJ1 5IJ111 IJ118
BX1 3 BX1 2 BX1 1 IP3 2
IP3 6
IP1 8IP 3 11 IP314
IP3 5
IP3 161
ED1 A 4
A 8A7A6A 5A12 B 11 B7B10 C 8C7C 4
123
23
4
1 I9
I9 C C
6 FROM POWER SOURCE SYSTEM(
SEE PAGE 64)
R±L
R±L R±L R±L
BRY±L Y±R
BR BR BR Y±L Y±R Y±R
Y±L
BR
BR BR
B Y±G
BY±G
B
P
LG GG±B
G±B G±B
R±W
Y±B Y±BV±Y
R±L JUNCTION
CONNECTOR
BR
BR
FROM E NGINE CONTROL MODULE
(
E NGINE A ND E LE CTRONIC CONTROLLED
TRANSMISSION ECU)(
A/T)
FROM E NGINE CONTROL MODULE
(
ENGINE ECU)(
M/T)
FROM CRUISE CONTROL ECU
SPEEDFUEL
FUEL
WATER TEMP.
TA CHO
ABS
SEAT BELT
OIL
FUEL SENDER
WATER TEMP.
SENDER
IGNITER
VEHICLE SPEED
SENSOR
(
SPEED SENSOR)
TO AB S ECU
TO INTEGRATION
RELAY
OIL P RES SURE
SW
J2
B
W2
I2
V5
O1F1 5C
COMBINATION METER C8 ,C9 , C10
TO BACK±UP LIGHT SW(
M/T)
TO PARK/NEUTRAL POSITION SW
(
NEUTRAL START SW)(
A/T)
TO GENERA TOR(
ALTERNATOR) R±L
R±L
I18 6
TA C
COOLING FAN
ECU C14
BR
B
B JUNCTION CONNECTOR J7
(
*6) (
*6)
(
*7)A
A
(
*7)
(
*6)
1B 6 1D 610A
GAUGE
3D 13
3D 12
1D 121D 13
3C 133C 12

237
*
1 : W/O A/T INDICATOR LIGHT
* 2 : W/ A/T INDICATOR LIGHT
*
3 : MALFUNCTION INDICATOR LAMP
(
CHECK ENGINE WARNING LIGHT)
*7 : 5S±FE *
6 : 1MZ±FE * 5 : TMM MADE
*
4:TMCMADE
AB
C
COMBINATION METER1
IEIF 2 1B 15 B3B9B13
B 12B 8B14 C 1 C 3 A 9A 10C 2
II1 4
11B DE 18 A
FB E D
8 A
FAFROM POWER SOURCE SYSTEM(
SEE PAGE 64)
B±W
R±Y
R±GW±R Y±G B±W
B±O G± L
G±R
R±Y R±Y W±BG±RG± L
±B W±B
R±W R±W
R±W
G±O
Y
B±Y
R±BB±YY G±O R±Y
R±Y
R±W 10A
STARTER
TO LIGHT FAILURE
SENSOR
FROM º HEAD RHº FUSE
FROM º HEAD(
UP R±RH)
ºFUSE
(
CA NADA) (
USA) CRUISE
(
*3)
BRAKE
BULB
CHECK
RE AR LIGHT
O/D OFF
CHARGE
SRS
HIGH BEAM
PKB BRK
TOO/DMAINSW
TO GENERATOR(
ALTERNATOR)
TO CENTER AIRBAG
SENSOR ASSEMBLY
TO DIMMER SW
[COMB. SW] TO CRUISE CONTROL ECU
TO E NGINE CONTROL MODULE
(
ENGINE AND ELECTRONIC CONTROLLED
TRANSMISSION ECU)(
A/T)
TO E NGINE CONTROL MODULE
(
ENGINE ECU)(
M/T)
BRAKE FLUID
LEVEL SWJUNCTION
CONNECTOR
JUNCTION
CONNE CTOR
DAYTIME RUNNING
LIGHT RELAY
(
MAIN) PARKING
BRAKE SW
PARKING
BRAKE SW(
EX. 1MZ±FE A/T)
(
1MZ±FE A/T)
JUNCTION
CONNECTOR
JUNCTION
CONNECTOR (
USA)
(
CANA DA) C8 ,C9 , C10
J2
J2 B2
P3
P2 D4
J2
J3(
*1) (
*1)
(
USA)
II1 2
I6
G±O
G±O G±O
(
*2) FROM A/T
INDICATOR LIGHT
W±B
(
CA NADA)(
*5) (
*5)
O
(
*4)O
(
*4)
4
3B 203C 2
1D 31F3 7. 5A
IGN7. 5A
SRS
3B 19 3D19 3B 83D18
3D 83C8 3A 10
1M 51C 8
W

238
COMBINATION METER* 1 : W/O A/T INDICATOR
AB
A 11 A2A1
A 3
C13 B5 B 16
IGB 4
G
R R RG±B G±YL±R
R±YW±BB B
W±B W±B
GG
FROM ELECTRONIC
CONTROLLED
TRANSMISSION PATT
SELECT SW
FROM HA ZA RD S W(
TR)
FROM HA ZA RD S W(
TL) METER
ILLUMINATION
POWER
TURN RH
TURN LH
OPEN DOOR TO RHEOSTAT
TO DOOR COURTESY SW
COMBINATION METER C8 ,C9 ,C10AI13 II16
TO E NGINE CONTROL
MODULE(
ENGINE AN
ELECTRONIC CONTRO
TRANSMISSION ECU)
L±R
L±R L±R
(
*1)
(
*1)
2G 220A
DOME
G
15A
TA IL
1D 14
3C 4
3D 5
3D 203D 9
1C 5
3A 161C 1
3C 14
1D10
1D11
1L 83C183D 6 1D 2
1M 11C 11
FROM POWER SOURCE SYSTEM(
SEE PAGE 64)
ERN
D
LLED

242
RADIATOR FAN AND CONDENSER FAN (5S±FE)
2B 12E82B32E6
55 55
55 55 2G 6
2E5
1 2EA1 1
M
1 2M
1 2
E5 5
EB EB
W±B W±B B±R B±R L±B
B±R
L
B W±B
W±R R WB±O B±R
W±B W±B
L
B±R
BW±BW±B
B±W
OM POWER SOURCE SYSTEM(
SEE PAGE 64)
30A
RDI FAN
24 13
4
FROM A/C
MAGNETIC
CLUTCH RELAY RADIATOR
FAN RELAY
RADIATOR
FAN RELAY
NO. 2
RADIATOR
FAN RELAY
NO. 3
A/C SINGLE
PRESSURE SW
WATER
TEMP. SW
(
FOR COOLING
FA N)RADIATOR
FAN MOTORA/C CONDE NSE R
FAN MOTOR A1
A2
R1
E532 51 15 23
3 2
EA1 2
1A 7FR
15A
ECU±IG
3A 153C 16
2B 40A
CDS FAN
3

243
FAN MOTOR OPERATION
WITH THE IGNITION SW IS TURNED ON, CURRENT FLOWS FROM ECU±IG FUSE TO RADIATOR FAN RELAY NO. 1 (COIL SIDE) AND
RADIATOR FAN RELAY NO. 2 (COIL SIDE) " TERMINAL 2 OF THE A/C SINGLE PRESSURE SW " TERMINAL 3 " TERMINAL 2 OF THE
WATER TEMP. SW " TERMINAL 1 " GROUND, AND RADIATOR FAN RELAY NO. 1 AND NO. 2 ARE TURNED ON.
*RADIATOR FAN MOTOR OPERATION
WHEN THE IGNITION SW IS TURNED ON, RADIATOR FAN RELAY NO. 1 IS TURNED ON. IF AT THIS TIME THE ENGINE COOLANT
TEMPERATURE IS APPROX. 90°C (194°F) OR HIGHER, THE WATER TEMP. SW IS TURNED OFF, RADIATOR FAN RELAY NO. 1 IS
TURNED OFF.
AS A RESULT, CURRENT FROM THE RDI FAN FUSE TO RADIATOR FAN RELAY NO. 1 (POINT SIDE) " TERMINAL 2 OF THE
RADIATOR FAN MOTOR " TERMINAL 1 " GROUND, THUS ACTIVATING THE ROTATION OF THE RADIATOR FAN MOTOR.
*LOW SPEED OPERATION
WHEN THE IGNITION SW IS TURNED ON AND THE A/C ACTIVATED, RADIATOR FAN RELAY NO. 1 AND RADIATOR FAN RELAY NO. 2
ARE TURNED ON, CURRENT FLOWS FROM A/C MAGNETIC CLUTCH RELAY (POINT SIDE) TO RADIATOR FAN RELAY NO. 3 (COIL
SIDE) " GROUND, AND RADIATOR FAN RELAY NO. 3 IS TURNED ON.
AS A RESULT, CURRENT FLOWS FROM CDS FAN FUSE TO TERMINAL 2 OF THE A/C CONDENSER FAN MOTOR " TERMINAL 1 "
RADIAOTR FAN RELAY NO. 2 (POINT SIDE) " RADIATOR FAN RELAY NO. 3 (POINT SIDE) " TERMINAL 2 OF THE RADIATOR FAN
MOTOR " TERMINAL 1 " GROUND, FLOWING TO EACH FAN MOTOR IN SERIES, CAUSING THE FAN TO AT LOW SPEED.
*HIGH SPEED OPERATION OF THE FAN MOTOR DUARING A/C OPERATION
WHEN THE A/C OPERATION, THE REFRIGERRANT PRESSURE BECOME HIGHER THAN OR DINARY LEVEL (APPROX. 15.58 KG/CM
2
(221.2 PSI, 1527 KPA)) THE A/C SINGLE PRESSURE SW IS TURNED OFF. AS A RESULT, RADIATOR FAN RELAY NO. 1 AND RADIATOR
FAN RELAY NO. 2 ARE TURNED OFF, AND CURRENT FLOWS FROM RDI FUSE TO RADIATOR FAN RELAY NO. 1 (POINT SIDE) "
TERMINAL 2 OF THE RADIATOR FAN MOTOR " TERMINAL 1 " GROUND, AND CURRENT FLOWS FROM CDS FAN FUSE TO
TERMINAL 2 OF THE A/C CONDENSER FAN MOTOR " TERMINAL 1 " RADIATOR FAN RELAY NO. 2 (POINT SIDE) " GROUND, AND
TO EACH FAN MOTOR IN PARALLEL, THUS CAUSING THE FAN MOTORS OPERATE HIGH SPEED.
NOTE THAT, BECAUSE THE CURRENT FLOWS IN THE SAME MENNER EVEN IF THE ENGINE COOLANT TEMPERATURE IS APPROX.
90°C (194°F) OR HIGHER, THE FAN MOTOR OPERATE AT HIGH SPEED.
A 2 A/C SINGLE PRESSURE SW
2±3 : OPEN ABOVE APPROX. 15.58 KG/CM2 (221.2 PSI, 1527 KPA)
CLOSE BELOW APPROX. 15.56 KG/CM2 (178.4 PSI, 1231 KPA)
2 1
2 1 A1R1 BLACKGRAY
12E5 A2BLACK
23
SYSTEM OUTLINE
SERVICE HINTS

244
ELECTRONICALLY CONTROLLED HYDRAULIC COOLING FAN (1MZ±FE)
1212
2 3EC1 8
ECEB I18
IP2 7
42 310 9 816 5
6 I18
B±R B±R W±R
LLB
L L±W L±W
L±W
L±R L±R W±BL±YY Y±LBR BR
E SOL+ SOL± TH± TH+ HPIGB TAC IDL FROM POWER SOURCE SYSTEM(
SEEPAGE64)
TO COMBINATION
METERFROM THROTTLE
POSITION SENSOR
FROM ENGINE CONTROL MODULE
(
ENGINE AND ELECTRONIC
CONTROLLED TRANSMISSION ECU)
SOLENOID VALVE
(
FOR HYDRAULIC MOTOR)
ENGINE COOLANT
TEMP. SENSOR
(
WATER TEMP. SENSOR)
(
FOR COOLING FAN)DATA LINK
CONNECTOR 1
(
CHECK
CONNECTOR)A/C SINGLE
PRESSURE SW COOLING FAN ECU C14
S1
E5D1 A2 OPT
3A 153C 16
1A 715A
ECU±IG

245
THE COOLING FAN ECU RECEIVES VARIOUS SIGNAL, I.E., THE ENGINE RPM SIGNAL FROM THE IGNITER, COOLANT TEMPERATURE
SIGNAL FROM THE ENGINE COOLANT TEMP. SENSOR (WATER TEMP. SENSOR), A/C REFRIGERANT PRESSURE SIGNAL FROM A/C
SINGLE PRESSURE SW.
THE COOLING FAN ECU JUDGES THE ENGINE BASED ON SIGNALS FROM ABOVE MENTION, DRIVES THE SOLENOID VALVE AND
CONTROLS THE SPEED OF THE COOLING FAN STEPLESSLY
FAIL±SAFE FUNCTION
WHEN THE MALFANCTION IS DETECTED BY THE ENGINE COOLANT TEMP. SENSOR (WATER TEMP. SENSOR) OR SOLENOID VALVE,
THE FAIL±SAFE FUNCTION OF THE COOLING FAN ECU JUDGES THE SITUATION TO ALLOWS THE COOLING SYSTEM TO CONTINUE
OPERATION.
A 2 A/C SINGLE PRESSURE SW
2±3 : OPEN ABOVE APPROX. 15.58KG/CM2 (221.2PSI, 1527KPA)
CLOSED BELOW APPROX. 12.56 KG/CM2
(178.4PSI, 1231KPA)
C14 COOLING FAN ECU
1±GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW ON
9±10 :2.5 VOLTS AT 20°C (68°F) AND IGNITION SW ON
1.2 VOLTS AT 80°C (176°F) AND IGNITION SW ON
8± 4 :10±14 VOLTS AT A/C PRESSURE SW ON (OPEN)
0±3 VOLTS AT A/C PRESSURE SW OFF (CLOSE)
4±GROUND : ALWAYS CONTINUITY
E 5 ENGINE COOLANT TEMP. SENSOR (WATER TEMP. SENSOR) (FOR COOLING FAN)
1±2 :1.5K
AT 80°C (176°F)
0.7K
AT 11 0°C (230°F)
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A 228D 128S 129
C1432E 530
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL 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)
EC138 (1MZ±FE)ENGINE WIRE AND ENGINE ROOM MAIN WIRE
IP244ENGINE WIRE AND COWL WIRE
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EB38 (1MZ±FE)FRONT LEFT FENDER
EC38 (1MZ±FE)INTAKE MANIFOLD RH
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
I1844ENGINE WIRE
2312
534
6X8 91012
12 A2 C14S1 E5BROWN GRAY BLACKD1BLACK
6
XX X
XX X XX
X
SYSTEM OUTLINE
SERVICE HINTS