TOYOTA SUPRA 1997 Service Repair Manual

I14
I14 I14 I14
I14
SPEED
II1 23
1E 112
1B 57. 5A
DOME IF3 10
B 12 C 3C1B9
B 13 C2C12 B10 B11II1 2II18
I14
I21
I14
IF FROM POWE R SOURCE SYS TEM (
SEE PAGE 56)
FROM POWER SOURCE SYSTEM (
SEE PAGE 56)
TO ENGINE CONTROL MODULE
TO CRUISE CONTROL ECU
TO E NGINE CONTROL
MODULETO RHEOSTAT
TO DIODE
(
INTERIOR LIGHT)
IF25 II1 11 VEHICLE SPEED SENSOR NO. 1
(
COMBINATION METER)
TEL LTALE LI GHT RH
JUNCTION
CONNECTOR
COMB INATION METERMANU O/ D OFF ILLUMINATION J 1
V10
T 6
B32
5 10 6 7 14 11
BB14 8 1
G- O G- O
G- O
Y
Y
Y Y
G- O
R L- R
W- G
P
BR
R- B
R- GR L- R L- R
R R W- LV W- G W- G
P P P
BRYY
R W- G
P
P
P
P W- GL- R
Y- G
R- Y
L- W R- G
Y- G
R- Y
L- WYY YY
G- O
G- O
Y
P P
R- BC
C10 , C11 , C12
BA
2 I 8 : * 6
I14 : * 5
5
11 PPS ECU P 4
A/C AMPLIFIER A13
10A
GAUGE
1E 12
SPEED
SPD
ODO AND TRIP
DOOR
222
COMBINATION METER

1G 91E 4II1 15 II125 IE1 5IF212 IF22 16 18 12 15 6 1 4 3 5 8 9
B- O
W- R Y- R
V
Y- G
B B- Y
L
L- B
LG - RL L- W
R- Y
L- B
Y- B
LG- R
W- B W- LY V
FROM POWER SOURCE SYSTEM (
SEE PAGE 56)
Y- G
R- Y
L- WY
Y- B
IE 1
TO INTEGRATION
RELAY
TO AI RBAG
SENSOR ASSEMBLY
TO ABS ECU
TO ENGINE CONTROL MODULE
TO THROTTLE ECU
OIL PRESSURE
SW
W- B
O 2 T 5 T 6
(
*3) (
*3)
12THEFT DETE RRENT AND
DOOR LOCK CONTROL ECU T13
LIGHT
FAILURE
SENSOR
7. 5A
IGN10A
ECU- B
1E 81E13
4
WRN
L 2
210 TELLTALE LIGHT LH
OIL LEVEL
ABS
OI L
TRAC OFF
SECURITY
MALFUNCTION
INDICATOR LAMP
32 TELL TALE LI GHT RH
SEAT BEL T
REAR LIGHT
CHRAGE
SRS
IND
1E 18
1J 1
223
*1 : USA
* 2 : CANADA * 4 : 2JZ- GE* 3 : 2JZ- GTE * 5 : 2JZ- GE M/T
* 6 : EXCEPT * 5

224
COMBINATION METER
B2 BRAKE FLUID LEVEL WARNING SW
1-2 : CLOSED WITH THE FLOAT DOWN
P5 PARKING BRAKE SW
1-GROUND : CLOSED WITH THE PARKING BRAKE LEVER PULLED UP
O2 OIL PRESSURE SW
1-GROUND : CLOSED WITH THE OIL PRESSURE ABOVE APPROX. 20 KPA (2.8 PSI, 0.2 KG/CM
2)
E4 ENGINE COOLANT TEMP. SENDER
1-GROUND : APPROX. 160-240 W (50
C, 122
F)
APPROX. 17.1-20.4 W (120
C, 288
F)
E7 ENGINE OIL LEVEL SENSOR
1-2 : CLOSED WITH THE FLOAT UP AND THE ENGINE OIL TEMP. AT BELOW APPROX. 55
C (131
F)
OPEN WITH THE FLOAT DOWN AND THE ENGINE OIL TEMP. AT BELOW APPOX. 60
C (140
F)
F14 FUEL SENDER
1-2 : APPROX. 3 W AT FUEL FULL
APPROX. 110 W AT FUEL EMPTY
C10 (B), C12 (A) COMBINATION METER
(B) 9-GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
(A) 16-GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW AT ST POSITION AND THE SHIFT LEVER AT P OR N
POSITION (A/T)
12 VOLTS WITH THE IGNITION SW AT ST POSITION AND THE CLUTCH PEDAL DEPRESSED
(M/T)
(A) 8-GROUND : ALWAYS CONTINUITY
(A) 11-GROUND : ALWAYS CONTINUITY
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
A1328E724 (2JZ-GTE)O227 (2JZ-GE)
B224 (2JZ-GTE)E726 (2JZ-GE)P225 (2JZ-GTE)B226 (2JZ-GE)E1029P227 (2JZ-GE)
C928F1430P429
C10B28G224 (2JZ-GTE)P529
C11C28G226 (2JZ-GE)T529
C12A28I427T629
D628J129T1329
E424 (2JZ-GTE)L230V1025 (2JZ-GTE)E426 (2JZ-GE)O225 (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
()
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 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
I238COWL WIREI8
I338INSTRUMENT PANEL WIREI1438INSTRUMENT PANEL WIRE
I438COWL WIREI21
12
1213 9 8 7 6 5 4 X 2 1101112
13 X 8 7 6 X 4 3 2 1 101112 1611 10 9 8 5 X 3 2 1X131467 15
XXX8
XX X X 181
X X
X16
XXX
123
4A AAABBB
AA AABBBB B
1BBLUE C10
CBROWN C11 AC12 B 2 C 9
D 6 E 4
F1 4 I 4 J 1
O 2GRAY
GRAY GRAYE1 0
DARK GRAY
DARK GRAY BLA CK
BLACK(
HINT : SEE PAGE 7) 12E 7
GRAY
X XX
XX
X
561 P 2 P 5GRAY 11 X X X
1
X 4 X
XXX
X5 A13 ORANGE
G 2 BLACK
L 2P 4 BLUE

226
COMBINATION METER
10 9 8 X 6 54 3 2 1
10 9 X X 6 54 3 2 1
1234 567
8 X 10 11 12 X 14 15 16 X 18
123 T 5 T 5 T 6
V10 (
2JZ- G E) (
2JZ- G TE)
BLACK
XX
X X 12 XT13 ORANGE

227
MEMO

228
RADIATOR FAN AND AUTOMATIC
1. HEATER BLOWER OPERATION
MANUAL 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 THE 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 BASE
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 THE BLOWER MOTOR
TERMINAL 1 TERMINAL M- OF THE 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 HE
BLOWER MOTOR CONTROL RELAY.
2. OPERATION OF AIR INLET CONTROL SERVO MOTOR
(SWITCHING FROM FRESH TO RECIRC)
WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS FROM HTR FUSE TO TERMINAL 2 OF THE AIR INLET
CONTROL SERVO MOTOR TERMINAL 5 TERMINAL AIR OF THE A/C AMPLIFIER TERMINAL GND 
GROUND, THE MOTOR ROTATES AND THE DAMPER STOPS AT RECIRC POSITION.
(SWITCHING FROM RECIRC TO FRESH)
WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS FROM HTR FUSE TO TERMINAL 2 OF THE AIR INLET
CONTROL SERVO MOTOR TERMINAL 3 TERMINAL AIF OF THE 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 THE IGNITION SW TURNED ON, THE CURRENT FLOWS FROM HTR FUSE TO TERMINAL IG OF THE A/C
AMPLIFIER
(SWITCHING FROM DEF TO FACE)
THE CURRENT FROM TERMINAL AOF OF THE A/C AMPLIFIER TERMINAL 1 OF THE AIR VENT MODE CONTROL
SERVO MOTOR TERMINAL 2 TERMINAL AOD OF THE 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 TP0 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 THE A/C AMPLIFIER TERMINAL 2 OF THE AIR VENT MODE
CONTROL SERVO MOTOR TERMINAL 1 TERMINAL AOF OF THA 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 COOLº SIDE, THE CURRENT FLOWS FROM TERMINAL AMC OF
THE A/C AMPLIFIER TERMINAL 1 OF THE AIR MIX CONTROL SERVO MOTOR MOTOR TERMINAL 2 
TERMINAL AMH OF THE 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 THE
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 WARMº SIDE, THE CURRENT FLOWS FROM
TERMINAL AMH OF THE A/C AMPLIFIER TERMINAL 2 OF THE AIR MIX CONTROL SERVO MOTOR MOTOR 
TERMINAL 1 TERMINAL AMC OF THE A/C AMPLIFIER, ROTATING THE MOTOR IN REVERSE AND SWITCHING
THE DAMPER FROM COOL TO WARM SIDE.
SYSTEM OUTLINE

229
AIR CONDITIONING
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 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 THE A/C MAGNETIC CLUTCH RELAY  TERMINAL 2 TERMINAL ACMG OF THE ENGINE
CONTROL MODULE TERMINAL A/C TERMINAL MGC OF THE 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 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.

E 9
E 9
E 2 22
22 22265 12
3
52 31
23 41531 42
22 22
1 2 4
21 IK1 3IK12EA1 1
IK1 1 IB4 1
IF15
IF313 IB23
EB IGA 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
L
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- BL 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 A 4
ENGINE COOLANT
TEMP. SW E 5
B 3
BLOWER MOTOR +B SI
M+ M- GNDBLOWER MOTOR
CONTROL RELAYB B 4 , B 5AE 9 : * 1
E21 : * 2
E11 : * 1
E26 : * 2R 2
R 3
A 3
A 2
A 3 A
EA E 5
W- B
L- B
W- B W- B W- B
7. 5A
HTR
1A 51K2
M
230
RADIATOR FAN AND AUTOMATIC

E 2
E 2 1 2
1 2
EBA AI25
B 9B13 C7B15 B6C21 B 16II1 31 II129
IHEA1 2
L- B
L- BL- B
L- B W- B W- B
W- BRADIATOR FAN MOTOR NO. 2 R20
A/C CONDENSER FAN MOTOR A 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 E10
IGNITER I 4
JUNCTION
CONNECTOR J 1A/C AMPLIFIERA A12 , A13
C GND VER 1 A/ C- I N BLW HR MGC IGNEXT
(
*1)
B , A14 E 2
1 2
RADIATOR FAN MOTOR NO. 1 R 1
L- B L- B
L- B W- B
MMM
ACMGA/ C(
*1)
AC(
*2)
TACO
231
AIR CONDITIONING* 1 : 2JZ- GTE
* 2 : 2JZ- GE