TOYOTA SUPRA 1986 Service Repair Manual

224
COMBINATION METER
B 2 BRAKE FLUID LEVEL WARNING SW
1±2 : CLOSED WITH FLOAT DOWN
P 5 PARKING BRAKE SW
1±GROUND : CLOSED WITH PARKING BRAKE LEVER PULLED UP
O 2 OIL PRESSURE SW
1±GROUND : CLOSED WITH OIL PRESSURE ABOVE APPROX. 20 KPA (2.8 PSI, 0.2 KG/CM2)
E 4 ENGINE COOLANT TEMP. SENDER (WATER TEMP. SENDER)
1±GROUND : APPROX. 160±240
(50°C, 122°F)
: APPROX. 17.1±20.4
(120°C, 288°F)
E 7 ENGINE OIL LEVEL SENSOR
1±2 : CLOSED WITH FLOAT UP AND ENGINE OIL TEMP. AT BELOW APPROX. 55°C (131°F)
OPEN WITH FLOAT DOWN AND ENGINE OIL TEMP. AT BELOW APPROX. 60°C (140°F)
F14 FUEL SENDER
1±2 : APPROX. 3
AT FUEL FULL
: APPROX. 11 0
AT FUEL EMPTY
C10(B), C12(A) COMBINATION METER
(B) 9±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
(A)16±GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ST POSITION AND SHIFT LEVER AT P OR N POSITION (A/T)
12 VOLTS WITH IGNITION SW AT ST POSITION AND CLUTCH PEDAL DEPRESSED (M/T)
(A) 8±GROUND : ALWAYS CONTINUOUS
(A)11±GROUND : ALWAYS CONTINUOUS
(A) 2±GROUND : ALWAYS APPROX. 12 VOLTS
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
B224 (2JZ±GTE)E 426 (2JZ±GE)O 227 (2JZ±GE)B 226 (2JZ±GE)E724 (2JZ±GTE)P225 (2JZ±GTE)
C 928E 726 (2JZ±GE)P 227 (2JZ±GE)
C10B28E1029P 529
C11C28F1430T 529
C12A28I 427T 629
D 628J 129V1025 (2JZ±GTE)
E 424 (2JZ±GTE)O 225 (2JZ±GTE)V1027 (2JZ±GE)
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
222R/B NO. 2 (ENGINE COMPARTMENT LEFT)
423R/B NO. 4 (LEFT KICK PANEL)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B20ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1E20INSTRUMENT PANEL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1G
1H
1I20COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1J
20COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1K
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IB136ENGINE ROOM MAIN WIRE AND COWL WIRE (LEFT KICK PANEL)IB236ENGINE ROOM MAIN WIRE AND COWL WIRE (LEFT KICK PANEL)
IE136INSTRUMENT PANEL WIRE AND FLOOR NO. 2 WIRE (LEFT KICK PANEL)
IF136INSTRUMENT PANEL WIRE AND COWL WIRE (INSTRUMENT PANEL REINFORCEMENT LH)IF236INSTRUMENT PANEL WIRE AND COWL WIRE (INSTRUMENT PANEL REINFORCEMENT LH)
IF336INSTRUMENT PANEL WIRE AND COWL WIRE (RIGHT KICK PANEL)
II138ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
IJ238ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
BP140FUEL GAUGE WIRE AND FLOOR NO. 2 WIRE (LUGGAGE ROOM FRONT LH)
SERVICE HINTS

225
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EB32 (2JZ±GTE)FRONT SIDE OF LEFT FENDEREB34 (2JZ±GE)FRONT SIDE OF LEFT FENDER
EC32 (2JZ±GTE)FRONT SIDE OF INTAKE MANIFOLDEC34 (2JZ±GE)FRONT SIDE OF INTAKE MANIFOLD
IE36LEFT KICK PANELIF36LEFT KICK PANEL
IH36RIGHT KICK PANEL
: SPLICE POINTS
CODESEE PAGEWIRE HARNESS WITH SPLICE POINTSCODESEE PAGEWIRE HARNESS WITH SPLICE POINTS
I 238COWL WIREI1438INSTRUMENT PANEL WIREI 338INSTRUMENT PANEL WIREI2138INSTRUMENT PANEL WIRE
I 838INSTRUMENT PANEL WIRE

226
COMBINATION METER

228
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
1. HEATER BLOWER OPERATION
MANNAL BLOWER OPERATION
WHEN THE BLOWER CONTROL SW IS SET TO ANY BLOWER SPEEDS, THE A/C AMPLIFIER OPERATES AND THE CURRENT TO DRIVE
THE BLOWER MOTOR FLOWS FROM TERMINAL BLW OF THE A/C AMPLIFIER TO TERMINAL SI OF THE BLOWER MOTOR CONTROL
RELAY. THE CURRENT ACTIVATES THE RELAY AND THE VOLTAGE APPLIED TO TERMINAL +B OF THE BLOWER MOTOR CONTROL
RELAY IS OUTPUT AT TERMINAL M+ AS THE VOLTAGE FOR THE SELECTED BLOWER SPEED. THE CURRENT THEN FLOWS FROM
TERMINAL M+ OF THE BLOWER MOTOR CONTROL RELAY TO TERMINAL 2 " TERMINAL 1 " TERMINAL M± OF BLOWER MOTOR
CONTROL RELAY " TERMINAL GND " GROUND, AND THE BLOWER MOTOR OPERATES AT THE BLOWER SPEED SELECTED.
AUTO FUNCTION
WHEN THE AUTO SW IS TURNED ON, THE A/C AMPLIFIER CALCULATES THE REQUIRED VENT TEMPERATURE BASED ON THE SET
TEMPERATURE AND INPUT FROM EACH SENSOR. THEN TERMINAL BLW OF THE A/C AMPLIFIER INPUTS CURRENT TO TERMINAL SI
OF THE BLOWER MOTOR CONTROL RELAY IN CONFORMITY WITH THE REQUIRED VENT OUTPUT. THIS CURRENT ACTIVATES THE
BLOWER MOTOR CONTROL RELAY SO THAT CURRENT FLOWS FROM TERMINAL M+ OF THE BLOWER MOTOR CONTROL RELAY "
TERMINAL 2 OF BLOWER MOTOR " TERMINAL 1 " TERMINAL M± OF BLOWER MOTOR CONTROL RELAY " TERMINAL GND "
GROUND, ACTIVATING THE BLOWER MOTOR. THE BLOWER MOTOR THEN OPERATES AT DIFFERENT STEPS IN CONFORMITY WITH
VARIABLE CURRENT FLOW OUTPUT FROM TERMINAL BLW OF THE A/C AMPLIFIER TO TERMINAL SI OF THE BLOWER MOTOR
CONTROL RELAY.
2. OPERATION OF AIR INLET CONTROL SERVO MOTOR
(SWITCHING FROM FRESH TO RECIRC)
WITH IGNITION SW TURNED ON, THE CURRENT FLOWS FROM HTR FUSE TO TERMINAL 2 OF AIR INLET CONTROL SERVO MOTOR
" TERMINAL 5 " TERMINAL AIR OF A/C AMPLIFIER " TERMINAL GND " GROUND, THE MOTOR ROTATES AND THE DAMPER
STOPS AT RECIRC POSITION.
(SWITCH(NG FROM RECIRC TO FRESH)
WITH IGNITION SW TURNED ON, THE CURRENT FLOWS FROM HTR FUSE TO TERMINAL 2 OF AIR INLET CONTROL SERVO MOTOR
" TERMINAL 3 " TERMINAL AIF OF A/C AMPLIFIER " TERMINAL GND " GROUND, THE MOTOR ROTATES AND THE DAMPER
STOPS AT FRESH POSITION.
3. OPERATION OF AIR VENT MODE CONTROL SERVO MOTOR
WITH IGNITION SW TURNED ON, THE CURRENT FLOWS FROM HTR FUSE TO TERMINAL IG OF A/C AMPLIFIER
(SWITCHING FROM DEF TO FACE)
THE CURRENT FROM TERMINAL AOF OF A/C AMPLIFIER " TERMINAL 1 OF AIR VENT MODE CONTROL SERVO MOTOR "
TERMINAL 2 " TERMINAL AOD OF A/C AMPLIFIER " TERMINAL GND " GROUND. THE MOTOR ROTATES AND THE DAMPER
MOVES TO FACE SIDE. WHEN THE DAMPER OPERATES WITH THE A/C SW AT FACE POSITION, THE DAMPER POSITION SIGNAL IS
INPUT FROM TERMINAL 3 OF THE SERVO MOTOR TO THE TERMINAL TPO OF THE A/C AMPLIFIER. AS A RESULT, CURRENT TO THE
SERVO MOTOR CIRCUIT IS CUT OFF BY THE AMPLIFIER, SO THE DAMPER STOPS AT THAT POSITION.
(SWITCHING FROM FACE TO DEF)
THE CURRENT FLOWS FROM TERMINAL AOD OF A/C AMPLIFIER " TERMINAL 2 OF AIR VENT MODE CONTROL SERVO MOTOR "
TERMINAL 1 " TERMINAL AOF OF A/C AMPLIFIER " TERMINAL GND " GROUND, THE MOTOR ROTATES AND THE DAMPER STOPS
AT THAT POSITION.
4. OPERATION OF AIR MIX CONTROL SERVO MOTOR
WHEN THE TEMPERATURE SW IS TURNED TO THE ªCOOLº SIDE, THE CURRENT FLOWS FROM TERMINAL AMC OF A/C AMPLIFIER
" TERMINAL 1 OF AIR MIX CONTROL SERVO MOTOR " MOTOR " TERMINAL 2 " TERMINAL AMH OF A/C AMPLIFIER " TERMINAL
GND " GROUND AND THE MOTOR ROTATES. THE DAMPER OPENING ANGLE AT THIS TIME IS INPUT FROM TERMINAL 3 OF SERVO
MOTOR TO TERMINAL TP OF A/C CONTROL ASSEMBLY, THIS IS USED TO DETERMINE THE DAMPER STOP POSITION AND MAINTAIN
THE SET TEMPERATURE.
WHEN THE TEMPERATURE CONTROL SW IS TURNED TO THE ªWARMº SIDE, THE CURRENT FLOWS FROM TERMINAL AMH OF A/C
AMPLIFIER " TERMINAL 2 OF AIR MIX CONTROL SERVO MOTOR " MOTOR " TERMINAL 1 " TERMINAL AM1 OF A/C AMPLIFIER,
ROTATING THE MOTOR IN REVERSE AND SWITCHING THE DAMPER FROM COOL TO WARM SIDE.
SYSTEM OUTLINE

229
5. AIR CONDITIONING OPERATION
THE A/C AMPLIFIER RECEIVES VARIOUS SIGNALS, I.E., THE ENGINE RPM FROM THE IGNITER, OUTLET TEMPERATURE SIGNAL
FROM THE A/C THERMISTOR, COOLANT TEMPERATURE FROM THE ENGINE COOLANT TEMP. SENSOR (EFI WATER TEMP. SENSOR)
AND THE LOCK SIGNAL FROM THE A/C COMPRESSOR, ETC.
WHEN THE ENGINE IS STARTED AND THE A/C SW (HEATER CONTROL SW) IS ON, A SIGNAL IS INPUT TO THE A/C AMPLIFIER. AS A
RESULT, THE GROUND CIRCUIT IN A/C AMPLIFIER IS CLOSED AND CURRENT FLOWS FROM HTR FUSE TO TERMINAL 1 OF A/C
MAGNETIC CLUTCH RELAY " TERMINAL 2 " TERMINAL ACMG OF ENGINE CONTROL MODULE (ENGINE ECU) " TERMINAL A/C "
TERMINAL MGC OF A/C AMPLIFIER " TERMINAL GND " GROUND, TURNING THE RELAY ON, SO THAT THE A/C MAGNETIC CLUTCH
IS ON AND THE A/C AMPLIFIER OPERATES.
AT THE SAME TIME, THE ENGINE CONTROL MODULE (ENGINE ECU) DETECTS THE MAGNETIC CLUTCH IS ON AND THE A/C
AMPLIFIER IS OPERATING AND OPENS DIRECTION TO AVOID LOWERING THE ENGINE RPM DURING A/C OPERATING.
WHEN ANY OF THE FOLLOWING SIGNALS ARE INPUT TO THE A/C AMPLIFIER, THE A/C AMPLIFIER OPERATES TO TURN OFF THE
AIR CONDITIONING.
*ENGINE RPM SIGNAL IS HIGH.
*COOLANT TEMP. SIGNAL IS HIGH.
*A SIGNAL THAT THE TEMPERATURE AT THE AIR OUTLET IS LOW.
*A SIGNAL THAT THERE IS A LARGE DIFFERENCE BETWEEN ENGINE SPEED AND COMPRESSOR SPEED.
*A SIGNAL THAT THE REFRIGERANT PRESSURE IS ABNORMALLY HIGH OR LOW.

230
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
7. 5A
HTR
E9
E9
E3E3
E2 2
1A 51K22
22 22265 12
3
52 31
23 41531 42
22 22
1 2 4
M
1 2
M
1 2
M 21 IK 1 3IK12EA1 1
IK1 1 IB 4 1
IF15
IF313 IB23
EB IGEB A 2A3
B 2B1A1 FROM POWER SOURCE SYSTEM(
SEE PAGE 56)
R±L
R±L
R±L
R±L
R±LR±L
W±G
L±W
L
L
II1 10
LL L±W
L L±W
LW±B W±B
R±L B
R±L R±L L±R
L±W W±B
L±R L±R
L B
BR
W±B W±B
L
R±L
L±B
L±BL±B
L±BL±BL
W±B W±B W±B
W±B
W±BW±BL±R W±R LL
W±G
R±L 22 11
(
*1) (
*1)
(
*1)
50A
HTR30A
FAN
RADIATOR FAN
RELAY NO. 2
RADIATOR FAN
RELAY NO. 1
HEATER
RELAY
A/C MAGNETIC
CLUTCH RELAY
A/C SINGLE
PRESSURE SW A/C MAGNETIC
CLUTCH A4
ENGINE COOLANT
TEMP. SW
(
WATER TEMP. SW) E5
RADIATOR
FAN MOTOR R1
A/C CONDENSER
FAN MOTOR A2
B3
BLOWER MOTOR +B SI
M+ M± GNDBLOWER MOTOR
CONTROL RELAYB B4 ,B5AE9:*1
E20 : * 2
E11 : * 1
E26 : * 2R2
R3
A 3
A 2
A3A
EA E5
W±B

231
*
1:2JZ±GTE
*2 : 2JZ±GE
A AI15
B 9B13 C7B15 B6C21 B 16II1 31 II129
IHEA1 2 R±L
W± G
L±W
L
LW±B
R±L
B±W
W±G
L±R
B±W B±WL±R L±WL L W±B
W±B W±B
W±B W±B W±B
W±G23 34 16
4
A(
*2) ENGINE CONTROL MODULE
(
ENGINE AND ELECTRONICALLY
CONTROLLED TRANSMISSION ECU) E10
IGNITER I4
JUNCTION
CONNECTOR J1A/C AMPLIFIERA A12 , A13C GND VER1 A/C±IN BLW HR MGC IGNEXT
(
*
1)
B ,A14 ACMG A/C TACO

232
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
IG1 16 IG113 IG115 IG114 IF1 10
I15
I15
B 8B19 B20 B17 C16 C4C10 C11 C1C2 A 1A6A18 A5B6B3B4 MA 9 W±B
R±L
R±L
R±L
R±L
G±R
G
GR G±R
G
GRR±L R±L R±L
R±L
V
R±Y
BR
Y
BR±W
GW±B
2 534
R±L
IG AIR AIF AIM/AMOUT L±RDEF L±DEF L±F/D L±FOOT L±B/L L±FACEAIR INLET CONTROL SERVO MOTOR A2 4HEATER CONTROL SWB H12 , H13A
A/C AMPLIFIERA A12 , A13CRR±
DEFOG DEF F/D FOOT B/L FACE
RECIRC
FRESH
B ,A14

233
*
1:2JZ±GTE
*2 : 2JZ±GE
C 6C17 C18 C19 C12 C15 C14 C3C13 B1B4B3B2A8A10 4 A9B11 B 12 B11 A7A15 3 A4A14 A17 A12 A16 B1B10 B9A13 B2B7A11 A2A10
I12
R±B
LG±B
GR
B
LG
P
B±W
P±B
R
LG±R
W±L
R±W
G±W
L±R
Y±B
P±B
V±W
L±B
BR±W V±W
BR±W
V±W A
A
L±MAUTO L±REC L±FRS L±A/C L±HI L±M3 L±M2 L±M1 L±L0 SW7 SW6 SW5 SW4 SW3 SW2 SW1 SG TSET
A/C AMPLIFIERA A12 , A13C AUTOREC/
FRS A/C FAND±FAND+ OFF
WARM COOL HEATER CONTROL SWB H12 , H13A
B ,A14

234
RADIATOR FAN AND AUTOMATIC AIR CONDITIONING
I12 I12I13
I13 I13 I13
I19 I14 I12 2 1
2 1
2 1 2 1
2 1 IB6 11 IB63 II120
II1 26 IF3 7IF38
IG1 6IG13IG17IG11 IG1 11 IG1 4IG15 2 1M
A 2A17 A5A6C22 B10 A7C8C9 A 16BR±W
V±W V±W BR±W
V±W BR±W BR±W
BR±W
V±W V±W V±W V±W
BR±W
Y±G
Y±L V±W BR±W
V±W
V±W
P±B
V±W
V±W
LG
V±W L±Y
Y± L
WV±W LG±R LG ±R
W Y±L L±YLG G±Y G±YP±BY± L Y±G BR±W
V±W P±B
V±W
V±W
G±YG±Y V±W
V±W
LG
BR±W
Y±L
W
534 2 1
P±B
V±W
S5 TS TR TAM LOCK±IN TPO TE AOD AOFTW
A/C ROOM
TEMP. SENSOR A16 A/C SOLAR SENSOR A17
A/C AMBIENT
TEMP. SENSOR A1
A/C LOCK SENSOR
[A/C MAGNETIC CLUTCH] A4
AIR VENT MODE
CONTROL SERVO MOTOR A26
A/C EVAPORATOR
TEMP. SENSOR A15
ENGINE COOLANT
TEMP. SENSOR
(
WATER TEMP. SENSOR)
(
FOR A/C SYSTEM) E11
A/C AMPLIFIERA A12 , A13CDEF
FACE
V±W
B ,A14