air condition TOYOTA CAMRY 1994 XV10 / 4.G Wiring Diagrams Workshop Manual

15
ABBREVIATIONS
ABBREVIATIONS
The following abbreviations are used in this manual.
ABS = Anti±Lock Brake System
ACIS = Acoustic Control Induction System
A/C = Air Conditioning
A/T = Automatic Transmission
COMB. = Combination
C/P = Coupe
ECU = Electronic Control Unit
EFI = Electronic Fuel Injection
EGR = Exhaust Gas Recirculation
ESA = Electronic Spark Advance
Ex. = Except
FL = Fusible Link
IAC = Idle Air Control
ISC = Idle Speed Control
J/B = Junction Block
LH = Left-Hand
MFI = Multiport Fuel Injection
M/T = Manual Transmission
O/D = Overdrive
R/B = Relay Block
RH = Right±Hand
RPM = Engine Speed
S/D = Sedan
SFI = Sequential Multiport Fuel Injection
SRS = Supplemental Restraint System
SW = Switch
TEMP. = Temperature
VSV = Vacuum Switching Valve
W/G = Wagon
w/ = With
w/o = Without
*The titles given inside the components are the names of the terminals (terminal codes) and
are not treated as being abbreviations.

79
2. CONTROL SYSTEM
*SFI (SEQUENTIAL MULTIPORT FUEL INJECTION) (EFI (ELECTRONIC FUEL INJECTION) SYSTEM
THE EFI SYSTEM MONITORS THE ENGINE CONDITION THROUGH THE SIGNALS INPUT FROM EACH SENSOR (INPUT SIGNALS
FROM (1) TO (12) ETC.). 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, #40, #50 AND #60
OF THE ENGINE CONTROL MODULE (ECU) TO OPERATE THE INJECTOR (INJECT THE FUEL). THE 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), (3), (4) TO (12) ETC.). THE BEST IGNITION TIMING IS DECIDED ACCORDING TO
THIS DATA AND THE MEMORIZED DATA IN THE ENGINE CONTROL MODULE (ECU) AND THE CONTROL SIGNAL IS OUTPUTS TO
TERMINALS IGT1, IGT2, IGT3, IGT4, IGT5 AND IGT6. THIS SIGNAL CONTROLS THE IGNITER TO PROVIDE THE BEST IGNITION
TIMING FOR THE DRIVING CONDITIONS.
*HEATED OXYGEN SENSOR (OXYGEN SENSOR) HEATER CONTROL SYSTEM
THE 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 OXYGEN SENSOR (NO. 1 AND NO. 2) TO IMPROVE DETECTION
PERFORMANCE OF THE SENSOR.
THE ENGINE CONTROL MODULE (ECU) EVALUATES THE SIGNALS FROM EACH SENSOR (INPUT SIGNALS FROM (1), (4), (9) TO (10)
ETC.), AND OUTPUT CURRENT TO TERMINALS HTL, HTR AND HTS AND CONTROL THE HEATER.
*IAC (IDLE AIR CONTROL (ISC)) SYSTEM
THE IAC (ISC) 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 (ECU) EVALUATES THE SIGNALS FROM EACH SENSOR (INPUT SIGNALS FROM (1), (4), (5), (8), (9) ETC.),
OUTPUTS CURRENT 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), ETC)., AND
OUTPUTS CURRENT TO TERMINAL EGR TO CONTROL THE EGR VALVE.
*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 (ECU) JUDGES THE ENGINE SPEED BY THE SIGNALS ((4), (5)) FROM EACH SENSOR AND
OUTPUTS SIGNALS TO THE TERMINAL ACIS TO CONTROL THE VSV (FOR OPENING AND CLOSING THE INTAKE CONTROL VALVE)
3. DIAGNOSIS SYSTEM
WITH THE DIAGNOSIS SYSTEM, WHEN THERE IS A MALFUNCTION IN THE ENGINE CONTROL MODULE (ECU) SIGNAL SYSTEM, THE
MALFUNCTIONING SYSTEM IS RECORDED IN THE MEMORY.
4. FAIL±SAFE SYSTEM
WHEN A MALFUNCTION HAS OCCURRED 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.

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.

94
ENGINE CONTROL (5S±FE A/T AND CALIFORNIA M/T)
E 7(C), E 8(B), E10(A) ENGINE CONTROL MODULE (ENGINE AND ELECTRONIC CONTROLLED TRANSMISSION ECU) (A/T)E11(C), E12(B), E14(A) ENGINE CONTROL MODULE (ENGINE ECU) (M/T)
VOLTAGE AT ENGINE CONTROL MODULE (ECU) WIRING CONNECTOR
BATT ± E1: ALWAYS 9.0±14.0 VOLTS
+B ± E1:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
+B1 ± E1:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
IDL ± E2:9.0±14.0 VOLTS (IGNITION SW ON AND THROTTLE VALVE OPEN)
VC ± E2:4.5± 5.5 VOLTS (IGNITION SW AT ON POSITION)
VTA ± E2:0.3± 0.8 VOLTS (IGNITION SW ON AND THROTTLE VALVE FULLY CLOSED)
:3.2± 4.9 VOLTS (IGNITION SW ON AND THROTTLE VALVE OPEN)
PIM ± E2:3.3± 3.9 VOLTS (IGNITION SW AT ON POSITION)
#10, #20 ± E01, E02:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION) (EX. CALIFORNIA)
#10, #20,
#30, #40 ± E01, E02:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION) (CALIFORNIA)
THA ± E2:0.5± 3.4 VOLTS (IGNITION SW ON AND INTAKE AIR TEMP. 20°C, 68°F)
THW ± E2:0.2± 1.0 VOLTS (IGNITION SW ON AND COOLANT TEMP. 80°C, 176°F)
STA ± E1:6.0±14.0 VOLTS (ENGINE CRANKING)
IGT ± E1: PULSE GENERATION (ENGINE CRANKING OR IDLING)
W ± E1:9.0±14.0 VOLTS (NO TROUBLE AND ENGINE RUNNING)
ACT ± E1:9.0±14.0 VOLTS (IGNITION SW ON AND AIR CONDITIONING ON)
ACA ± E1:7.5±14.0 VOLTS (IGNITION SW ON AND AIR CONDITIONING ON)
TE1 ± E1:9.0±14.0 VOLTS (IGNITION SW ON)
NSW ± E1:0± 3.0 VOLTS (IGNITION SW ON AND PARK/NEUTRAL POSITION SW (NEUTRAL START SW)
POSITION P OR N POSITION)
9.0±14.0 VOLTS (IGNITION SW ON AND EX. PARK/NEUTRAL POSITION SW
(NEUTRAL START SW) POSITION P OR N POSITION)
RESISTANCE AT ENGINE CONTROL MODULE (ECU) WIRING CONNECTORS
(DISCONNECT WIRING CONNECTOR)
IDL ± E2: INFINITY (THROTTLE VALVE OPEN)
2.3 KW OR LESS (THROTTLE VALVE FULLY CLOSED)
VTA ± E2:3.3 ±10.0 KW (THROTTLE VALVE FULLY OPEN)
0.2 ± 0.8 KW (THROTTLE VALVE FULLY CLOSED)
VC ± E2:3.0 ±7 0 KW
THA ± E2:2.0 ±3.0 KW (INTAKE AIR TEMP. 20°C, 68°F)
THW ± E2:0.2 ±0.4 KW (COOLANT TEMP. 80°C, 176°F)
G1, NE ± G±:0.17±0.21 KW
ISCC, ISCO± +B, +B1:19.3±22.3 W
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A1032E11A32J 133
C 832E12C32K 131
C 9A32E14B32M 131
C10C32F15A34 (S/D), 35 (C/P), 36 (W/G)N 131
D 130I 131O 231
D 230I 231O 331
D 332I 331T 131
D 632I 431V 131
E 130I 531V 231
E 430I 631V 331
E 7C32I 731V 531
E 8B32I1031
E10A32I1233
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
125R/B NO. 1 (LEFT KICK PANEL)
626R/B NO. 6 (BEHIND GLOVE BOX)
SERVICE HINTS

102
ENGINE CONTROL (5S±FE M/T EX. CALIFORNIA)
E11(A), E12(B), E14(C) ENGINE CONTROL MODULE (ENGINE ECU)
VOLTAGE AT ENGINE CONTROL MODULE (ECU) WIRING CONNECTOR
BATT ± E1: ALWAYS 9.0±14.0 VOLTS
+B ± E1:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
+B1 ± E1:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
IDL ± E1:9.0±14.0 VOLTS (IGNITION SW ON AND THROTTLE VALVE OPEN)
PIM ± E2:3.3± 3.9 VOLTS (IGNITION SW AT ON POSITION)
#10, #20 ± E01, E02:9.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
THA ± E2:0.5± 3.4 VOLTS (IGNITION SW ON AND INTAKE AIR TEMP. 20°C, 68°F)
THW ± E2:0.2± 1.0 VOLTS (IGNITION SW ON AND COOLANT TEMP. 80°C, 176°F)
STA ± E1:6.0±14.0 VOLTS (ENGINE CRANKING)
IGT ± E1:0.8±1.2 VOLTS (ENGINE CRANKING OR IDLING)
ISCC, ISCO± E1:8.0±14.0 VOLTS (IGNITION SW AT ON POSITION)
W ± E1:9.0±14.0 VOLTS (IGNITION SW ON, NO TROUBLE AND ENGINE RUNNING)
ACT ± E1:9.0±14.0 VOLTS (IGNITION SW ON AND AIR CONDITIONING ON)
ACA ± E1:7.5±14.0 VOLTS (IGNITION SW ON AND AIR CONDITIONING ON)
TE1 ± E1:9.0±14.0 VOLTS (IGNITION SW ON)
RESISTANCE AT ENGINE CONTROL MODULE (ECU) WIRING CONNECTORS
(DISCONNECT WIRING CONNECTOR)
IDL ± E1: INFINITY (THROTTLE VALVE OPEN)
0 W (THROTTLE VALVE FULLY CLOSED)
THA ± E2:2.0 ±3.0 KW (INTAKE AIR TEMP. 20°C, 68°F)
THW ± E2:0.2 ±0.4 KW (COOLANT TEMP. 80°C, 176°F)
G+ ± G±:0.17±0.21 KW
ISCC, ISCO± +B, +B1:19.3±22.3 KW
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A1032E14C30K 131
C 832F1534 (S/D), 35 (C/P), 36 (W/G)M 131
C 9A32I 131N 131
C10B32I 231O 231
D 130I 331O 331
D 230I 431T 131
D 332I 531V 131
D 632I 631V 231
E 130I 731V 331
E 430I1031V 531
E11A30I1233
E12B30J 133
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
626R/B NO. 6 (BEHIND GLOVE BOX)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A
1B
1C20COWL WIRE AND J/B NO 1 (INSTRUMENT PANEL LEFT)1D20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
1G
1M
2A22ENGINE ROOM MAIN WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
2C22ENGINE WIRE AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
3A
3C24COWL WIRE AND J/B NO. 3 (BEHIND COMBINATION METER)
3D
24COWL WIRE AND J/B NO. 3 (BEHIND COMBINATION METER)
SERVICE HINTS

246
AIR CONDITIONING (PUSH CONTROL SW TYPE)
C
623 43
C 251
12 C
1
2
4
7
5 44
444
M
1 2
IK1 1IK13IK 1 2 4
I7 I7
I12
I13
I14
I13
IG HI M5 M4 M3 M2 M1 LO OFFBLOWER SW IK1 5
IK1 4I5
1
IIW±B R±L R±L
B
L±W
L±W
W±B
W±B W±B W±B W±BW±B L±B L±OB±W
L±BB±R BW±B W±B
L
R±L R±L
R±L
R±LR±L
W±B
W±B
W±B L±O
B±WFROM POWER 64)
BLOWER RESISTOR HE ATE R
RE LA Y 40A
HEA TER
JUNCTION
CONNECTOR
HEATER CONTROL SWB
R±L
R±L
R±L
W±B FROM POWER SOURCE SYSTEM(
SEE PAGE 64)
BLOWER MOTOR B4
B5
B6
H8 J1
1 4
W±B
B
I21
B
I14
B±W
1B 610A
GAUGE S OURCE SY STE M(
SEE PAGE

248
AIR CONDITIONING (PUSH CONTROL SW TYPE)
5 5
55
1 2
IP1 8EC1 4
IP3 9
IP3 4 I191
4
IR1 5IR16 IR14
5471
4 10 8 9 13 14 12 21
2 R±WR± BR±L
W± BW±R
L±WR±B R±W
W±R
W±L
L±Y
G B±Y LG±BB B BW±B
L± W(
*1)
L±Y
GL±B(
*1)
B± W
L± Y
R±LR± L R±L W±R
R±L
W±R
A/C DUAL
PRESSURE SW
A/C MAGNETIC
CLUTCH AND
LOCK SENSOR
A/C EVAPORATOR
TEMP. SENSOR
A/C MAGNETIC
CLUTCH RELAY
A/C AMPLIFIER
TO ENGINE CONTROL MODULE
(
ENGINE AND ELECTRONIC
CONTROLLED TRANSMISSION
ECU)(
A/T)
OR ENGINE CONTROL MODULE
(
ENGINE ECU)(
M/T) FROM ENGINE CONTROL MODULE
(
ENGINE AND ELECTRONIC
CONTROLLED TRANSMISSION
ECU)(
A/T)
OR ENGINE CONTROL MODULE
(
ENGINE ECU)(
M/T)
IGNITER245
13
W±R
A3A2
A11
A10
I2B±W
(
*
2) TO RADIATOR
FAN RELAY NO. 3E6
B± W
(
*1)
(
*2)
B±W(
*2) W±L(
*2)
TACH6
TAC
(
*2)
B
(
*1)
C14
COOLING FAN
ECU*1 : 1MZ±FE
*
2 : 5S±FE
1B 1
1D 12

249
1. AIR INLET CONTROL SERVO MOTOR OPERATION (FOR PUSH SW TYPE)
(SWITCHING FROM FRESH TO RECIRC)
WITH THE IGNITION SW ON, CURRENT FROM THE GAUGE FUSE FLOWS TO TERMINAL 1 OF THE SERVO MOTOR. WHEN THE
RECIRC SW IS TURNED ON, THE CURRENT FLOWS FROM SERVO MOTOR " TERMINAL 3 " TERMINAL 5 OF THE HEATER
CONTROL SW " TERMINAL 1 " GROUND, THE MOTOR ROTATES AND THE DAMPER MOVES TO THE RECIRC SIDE. WHEN IT IS IN
THE RECIRC POSITION, THE CIRCUIT IS CUT INSIDE THE SERVO MOTOR AND THE DAMPER STOPS IN THAT POSITION.
WHEN THE CIRCUIT FOR THE INDICATOR LIGHT, CURRENT FLOWS FROM THE GAUGE FUSE " TERMINAL 12 OF THE HEATER
CONTROL SW " INDICATOR LIGHT " TERMINAL 1 " GROUND AND THE INDICATOR LIGHT CONTINUES TO LIGHT UP WHILE THE
RECIRC SW IS ON.
(SWITCHING FROM RECIRC TO FRESH)
WHEN THE IGNITION IS ON AND THE FRESH SW IS TURNED ON, CURRENT FLOWS FROM TERMINAL 2 OF THE SERVO MOTOR "
TERMINAL 6 OF THE HEATER CONTROL SW " TERMINAL 1 " GROUND, THE MOTOR ROTATES AND THE DAMPER MOVES TO THE
FRESH SIDE. WHEN THE DAMPER IS IN THE FRESH POSITION, THE CIRCUIT IS CUT INSIDE THE SERVO MOTOR AND THE DAMPER
STOPS IN THAT POSITION.
2. OPERATION OF AIR VENT MODE CONTROL SERVO MOTOR
WHEN THE IGNITION SW ON, CURRENT FLOWS FROM THE GAUGE FUSE TO TERMINAL 12 OF THE HEATER CONTROL SW,
TERMINAL 6 OF THE AIR VENT MODE CONTROL SERVO MOTOR.
WHEN THE DAMPER IS IN FACE POSITION AND THE BI±LEVEL OF THE HEATER CONTROL SW IS THEN TURNED ON, CURRENT
FLOWS FROM TERMINAL 3 OF THE HEATER CONTROL SW " TERMINAL 4 OF THE AIR VENT MODE CONTROL SERVO MOTOR SO
THAT A SINGAL THAT THE GROUND CIRCUIT IS ACTIVATED IS INPUT TO TERMINAL ªBº OF THE CONTROL CIRCUIT INSIDE THE AIR
VENT MODE CONTROL SERVO MOTOR.
SIMULTANEOUSLY, A SIGNAL THAT THE GROUND CIRCUIT IS NOT ACTIVATED IS INPUT TO TERMINAL ªAº OF THE CONTROL
CIRCUIT INSIDE THE SERVO MOTOR. THESE TWO SIGNALS ACTIVATE THE CONTROL CIRCUIT SO THAT CURRENT FROM THE
GAUGE FUSE TO THE SERVO MOTOR, CAUSING THE SERVO MOTOR TO OPERATE AND THE DAMPER TO MOVE TO BI±LEVEL
POSITION. WHEN THE DAMPER REACHES BI±LEVEL POSITION, A GROUND CUT SIGNAL IS INPUT TO TERMINAL ªBº OF THE
CONTROL CIRCUIT, THE CONTROL CIRCUIT OPERATES, THE SERVO MOTOR STOPS ROTATING AND THE DAMPER STOPS AT
BI±LEVEL.
WHEN ANOTHER MODE POSITION IS SWITCHED TO, INPUT OF SIGNALS TO TERMINAL ªAº AND TERMINAL ªBº OF THE CONTROL
CIRCUIT THAT GROUND IS MADE OR GROUND IS NOT MADE (AS EXPLAINED ABOVE) ACTIAVTES THE CONTROL CIRCUIT AND
MOVES THE SERVO MOTOR TO THE DESIRED POSITION.
3. AIR CONDITIONING OPERATION
WHEN THE IGNITION SW ON, CURRENT FLOWS FROM GAUGE FUSE TO TERMINAL 12 OF THE HEATER CONTROL SW, TERMINAL 6
OF THE AIR VENT MODE CONTROL SERVO MOTOR.
WHEN THE BLOWER SW IS ON, CURRENT FLOWS FROM THE GAUGE FUSE " HEATER RELAY (COIL SIDE) " TERMINAL 7 OF THE
BLOWER SW " TERMINAL 5 " GROUND, ACTIVATING THE HEATER RELAY. THIS CAUSES CURRENT TO FLOW FROM THE HEATER
FUSE TO THE HEATER RELAY (POINT SIDE) " A/C FUSE " TERMINAL 7 OF THE HEATER CONTROL SW (A/C SW). IF THE HEATER
CONTROL (A/C SW) IS THEN TURNED ON AT THIS TIME, A SIGNAL IS INPUT TO THE A/C AMPLIFIRE. THIS ACTIVATES THE A/C
AMPLIFIER AND A/C MAGNETIC CLUTCH RELAY SO THAT CURRENT FLOWS FROM THE GAUGE FUSE TO THE A/C MAGNETIC
CLUTCH RELAY (POINT SIDE) " A/C MAGNETIC CLUTCH, CAUSING THE COMPRESSOR TO OPERATE. THE VSV (FOR A/C IDLE±UP)
IS TURNED ON SIMULTANEOUSLY TO PREVENT A DECREASE IN ENGINE SPEED DUE TO A/C OPERATION.
HEATER RELAY
(4)5± (4)4 : CLOSED WITH THE IGNITION SW ON AND BLOWER SW ON
A/C MAGNETIC CLUTCH RELAY
(4)5± (4)3 : CLOSED WITH THE IGNITION SW ON AND BLOWER SW ON AND A/C SW ON
A 2 A/C DUAL PRESSURE SW
1±4 : OPEN WITH PRESSURE 2.1 KG/CM (30 PSI, 206 KPA) OR ABOVE 27 KG/CM (384 PSI, 2646 KPA)
B 5 BLOWER RESISTOR
6±2 : APPROX. 1.12 W
2±3 : APPROX. 0.5 W
3±1 : APPROX. 0.2 W
SYSTEM OUTLINE
SERVICE HINTS

250
AIR CONDITIONING (PUSH CONTROL SW TYPE)
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A 228 (1MZ±FE), 30 (5S±FE)A1732H 833
A 328 (1MZ±FE), 30 (5S±FE)B 432I 230 (5S±FE)
A1032B 532J 133
A1132B 632
A1632C1432
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
425R/B NO. 4 (RIGHT KICK PANEL)
526R/B NO. 5 (ENGINE COMPARTMENT LEFT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B20COWL WIRE AND J/B NO 1 (INSTRUMENT PANEL LEFT)1D20COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
: 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 WIREEC140 (5S±FE)ENGINE WIRE AND ENGINE ROOM MAIN WIRE
IK142COWL WIRE AND A/C SUB WIRE
IL142COWL WIRE AND SERVO MOTOR SUB WIRE
IP144ENGINE WIRE AND COWL WIREIP344ENGINE WIRE AND COWL WIRE
IR144ENGINE ROOM MAIN WIRE AND COWL WIRE
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
IG42INSTRUMENT PANEL BRACE LH
II42RIGHT KICK PANEL
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
E638 (1MZ±FE)ENGINE ROOM MAIN WIREI12E 640 (5S±FE)ENGINE ROOM MAIN WIREI1344COWL WIREI 544COWL WIREI1444COWL WIRE
I 744COWL WIREI19

252
AIR CONDITIONING (LEVER CONTROL SW TYPE)
4 4
44 4
M
M
1
5 4 3 2 7 2 613
3584
145678 6 CC
I7
I12 I13
I14
I13
IG II251
2
43
IL1 7IL11
IL1 2IL1 3
IL1 4IL1 5 1 I5
IL1 6
1 HI M2 M1B
A 4
CONTROL
CIRCUIT
I14R±L R±L R±L
R±L
W±B W±B
W±B
W±BB R±L
B
B±WR±L
L
R±L
W±B W±B
R±Y
B±Y
L±B
R
G±W B±WL±W W±B
W±B W±B W±BW±B
L±O
L±B
L±R
L
L±WYL GBB W±B
L±W
40A
HEA TER
4
R±L
HEATER
RELAYJUNCTION
CONNECTOR
AIR VENT MODE CONTROL SERVO MOTOR
BLOWER RESISTOR
BLOWER
MOTOR
B±W
L±O
L±B
BLOWER SWAIR VENT MODE
CONTROL SW OFF FROM POWER SOURCE SYSTEM(
SEE PAGE 64)
DEF
F/D
FOOT
B/L
FACE
DEF
F/D
FOOT
B/L
FACE
FACE B/L FOOT F/D DE F LO B4B5
B6H8 A17 J1
IK1 1IK13IK12IK14 I21
B
1B 610A
GAUGE