1994 TOYOTA CAMRY coolant

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

OVERALL ELECTRICAL WIRING DIAGRAM
1
234
5CAMRY
4ACC
IG1
ST1
IG2
ST2 AM1 2
9 10 AM2
2 1
2 1
2 1
2 1
6412G 12H21G8
1G 92D 2
661A 6
2B 2
1E 14
2D12 IP3
IP19
3EF1
EB BL1C 113A 13
3C 18
1M 116 IJ1
BX14
BX15
5 4
M21
21
21
EC 15 IP3 2C 3
ACCAAA CBBBBBA A A A C C C C B B
C A AAA BB B CABB
EC ED1 11IP1
19 IP3 13 IP3C1G 3
3D 5
3D 18
3D 7 3C 51B 6
666
21 A
B
W±R W W W B
W± B
B±Y
B± O
W± RB±O
W± B
B± O B± O B±O B±O
B±O
G± Y
G±R
LG
LG
L±B
G±R
BR
B± Y
R
B
L
B± R
G± R
R
L
B
Y V±YW W± R
W± B W± BR± L
WW
BR
W± B
W± BY± G
G±W
R±W W G±R R± W G±WGR B± OL±B W± R W± R W± R
Y W±B W±B W±BB±W
B±O
BR BRW± L
BR
BR
BR
BR
R
R
G
P
R± L
GR
G± W
R±WY W G±R
W± G
BW± R W
Y W± R W± R L±B
L±B
W± BL±B B±OB± OBR BR BR BR
G±R
G±R R±W
G±W
GRB±Y
BR
R± L
271
10 9
1216
4313 2963 128
8 2 1
15 2 13 9 8 12 1
3417185
11 22 32613 15 6 8 7
1412123432 1
2
13
32 I12
IGNITION SW
100A ALT
FUSE BOX
30A
AM215A
EFI7. 5A
IGN
EF I MAI N REL AY
I1
I DLE AIR CONTROL
VALVE(
I SC VALVE)
V1
VSV(
for A/C Idle±Up) CIRCUIT OPENING
RE LA Y
E4
ENGINE COOLANT TEMP. SENSOR
(
EFI WATER TEMP. SENSOR)
I10
I NTAKE AIR TEMP. SENSOR
(
IN±AIR TEMP. SENSOR)
E1
EGR GAS TEMP. SENSOR BATTERYF15
FUEL PUMPI7
INJECTOR
NO. 4 I5
INJECTOR
NO. 2 I6
INJECTOR
NO. 3 I4
INJECTOR
NO. 1
D 1 DATA LINK CONNECTOR 1
CHECK CONNECTOR)D3DATALINK
CONNECTOR 2(
TDCL)
O2
OXYGEN SENSOR(
Sub)
K1
KNOCK SENSOR
E1 FP B TE1 TE2 VF1 W OX2TE1 TE2 ENG W STA +B +B1 ISCO ISCC ISCV
BATTE21 THW THA THG E2 PIM VC ACT ACA ELS W NE+ NE± G±
FC # 10 TE1 TE2 VF OX1 KNKOX2E01
E02 IGFIGT
SPD E2 PIM VC M1
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR(
VA CCUM
SENSOR)T1
THROTTL E
POSI TI ON
SENSOR
D6
DI ODE(
for Idle±Up)
MAL FUNCT I ON
INDICATOR LAMP
(
CHE CK ENGI NE
WARNING LIGHT)
[COMB. METER]
10A
GA UGE J2
JUNCTION
CONNECTOR
Fr om Dist ributor
<2±3>
Fr om º TAILº
Fuse<16±2><17±2>
Fr om Ign it er
<2±3>
To Combination Meter
< 33±2>L±B G±R
G±R
FL MAIN
2. 0LB±O B±O
(
*1)
132 51
2
Under
the left
quar ter
pillar Instrument
panel
brace LH Front left
f enderIntake manifold
RH10
2 5 11TC ABTC AB
LG±R
Y± B G± L To Cru i se
Contr ol ECU< 24±2>
To ABS ECU
< 25±3> < 26±3>
To Cen ter
Air bag Sensor
As sembl y
< 23±4>From STARTER Fuse
< 2±1>
Fr om SRS War ning
Light[ COMB. METER]
< 23±4> From Cent er Airbag
Sensor Assembly< 23±4>
From ABS ECU
<25±2><26±3>
16TSR±G
To ABS ECU
< 25±3> < 26±3>
Intake
ma n i f o l d
LH Intake
manif old
RH 91D
18
IP1
W±R W± R
B10 12
B
IDL VT A
B± Y LG±B
To A/C
Amplifier
< 35±4> < 36±5>
21C
R± L3D 19
G±RG±R(
*2)
*2: TMCMade
11 IP1
B± O
19 IP1
7
40A AM1
6A
3
B
3
3D
3D 12
16 IP3
ED 12B± Y
14G± B
A/DFr om Cru i se
Contr ol ECU< 24±3>
From ABS ECU
< 25±2> < 26±3>
Intake
man if ol d
LH ABS
3BR
BR BRE1 E2
VC
VTA
IDL
3P
From º MIR±HTRº
Fuse< 24±4>
< 28±1>
(
*1)
Engine Control(
5S±FE Ex. A/T and California M/T) Power
Source
EGRAGV2
VSV(
for EGR Syst em)231 2B± O
B± O
G±R(
*3) R± W
A #20
25
L±B W± B
W
Y
B±Y Fro m SRS
Warning Light
[COMB. METER]
< 23±4>
*3: TMMMade
E NGI NE CONTROL MODUL E(
ENGI NE ECU) B±O
W± G W± B15B
1B
F10 A , F1 6 B
4IP1 B±W
C9 A ,C10 B
11
E1 1 A , E14 C,E12 B *1 : SHI ELDEDFor the connec tor s of t he part s listed below, s ee t he next page.
*Fus e Box
*Engine Control Module(
Engine ECU)
*Malfanc tion Indic ator Lamp(
Check Engine Warning Light)
IGG+
L
L To Cruise Control ECU
< 24±2>
B±W
O3
OXYGEN SENSOR(
Main)
1W
(
*1)
BR BR BRA
24E1BR
W(
*1)
4
R±L
4 OX 1
From Igniter
<2±3>B19IG
(
Cont. next page)

1
234
27 CAMRY
4ACC
IG1
ST 1
IG2
ST 2 AM13
2
AM2
1G 91G 3
3C 16
1E 11A 71L1
3A 15
3EF17IP213 II2
8EC1
12
ECEB BL2H 2 1G 10
1C 1 1L 92G 2
1H 6
1 I G1 2 I G1B
B
From Radio and Player
<30±1><32±2>
BWWW
B
L
W± R B ± R B ± R
B±R B±R B±R
L±R
RRP±L
B B±Y BR
Y±L
Y
L±Y
L±W
L±R
W±B W±B
B± R
P±LB±R
P± LL±R L±R
P±L
B±Y
4231098
143 651
56 2
12
C C
L±R
E IG ACC
ANT AMPB IGB
HP TH+ TH± SOL±
A21
AUTO ANTENNA MOTOR AND RELAYJ3
JUNCTION
CONNE CTOR
A2
A/ C SI NGL E
PRESSURE SW E5
ENGINE COOLANT
TEMP. SENSOR
(
WATER TEMP. SENSOR)
(
for Cooling Fan) I12
IGNITION SW
100A ALT
C1 4
COOLI NG F AN ECU15A
ECU± I G
TAC I DL
ESOL+
FL MAIN
2. 0L
BATTERYS1
SOLENOID VALVE
(
for Hydraulic Motor)15A
CIG/RADIO20A
DOME
40A
AM1
FUSE BOX
L±W
L±W
To Data Link Connector 1
(
Check Connector)
< 3±2>
9II2L±R B
B
Int ake manifold RH Front left
f enderUnder the left
quarter pillar 1 2
9IG1 10IG1
3
2
W± B
J5
JUNCTION
CONNECTOR
BR
From Engine Contr ol Module
(
Engine and Elec tronic
Controlled Tr ans miss ion
ECU)
<3±8>
Power
SourceElectronically Controlled
Hydraulic Cooling Fan(
1MZ±FE)Auto Antenna(
W/G)
1B 1A
1CF1 0 A , F1 6 C,B (
5S±FE) (
1MZ±FE)
C F1 6B (
5S±FE)
F10A (
1 MZ± FE)
F10FUSE BOX
1 18IP1
BFrom Engine Contr ol Module
(
Engine and Elec tronic
Controlled Tr ans miss ion
ECU)
<3±7>