1997 TOYOTA SUPRA radiator

CO092-02
S04950
- COOLINGELECTRIC COOLING FAN (2JZ-GTE)
CO-31
1444 Author
: Date
:
1997 SUPRA (RM502U)
REMOVAL
1. REMOVE RADIATOR (See page CO-22)
2. REMOVE FAN
Remove the 6 screws and 2 fans.
3. REMOVE FAN MOTOR
(a) Disconnect the 2 connectors from the fan shroud.
(b) Remove the 6 screws and 2 fan motors.
NOTICE:
Install the fan motor so that its water drainage hole faces
downward.
Torque: 3.9 N´m (40 kgf´cm, 35 in.´lbf)
4. REASSEMBLY IS IN THE REVERSE ORDER OF RE-
MOVAL (See step 3)

P12291
No.1 Radiator
Fan Relay
CO095-01
P11929
Ohmmeter
No Continuity
Continuity1
2
43
Ohmmeter
P11928
Ohmmeter
Continuity1
2
43
Battery
P12292
No.2 Radiator
Fan Relay
P12133
No Continuity
Continuity 1 2
5 3 Ohmmeter
OhmmeterOhmmeter
Continuity
6 CO-34
- COOLINGRADIATOR FAN RELAY
1447 Author
: Date
:
1997 SUPRA (RM502U)
RADIATOR FAN RELAY (2JZ-GTE)
INSPECTION
1. w/ Auto Spoiler:
REMOVE LH HEADLIGHT
2. w/o Auto Spoiler:
REMOVE ENGINE UNDER COVER
3. INSPECT NO.1 RADIATOR FAN RELAY
(a) Remove the No.1 radiator fan relay. (Marking: RADIA-
TOR FAN RELAY)
(b) Inspect the No.1 radiator fan relay continuity.
(1) Using an ohmmeter, check that there is continuity
between terminals 3 and 4.
If there is no continuity, replace the relay.
(2) Check that there is no continuity between terminals
1 and 2.
If there is continuity, replace the relay.
(c) Inspect the No.1 radiator fan relay operation.
(1) Apply battery positive voltage across terminals 3
and 4.
(2) Using an ohmmeter, check that there is continuity
between terminals 1 and 2.
If there is no continuity, replace the relay.
(d) Reinstall the No.1 radiator fan relay
4. INSPECT NO.2 RADIATOR FAN RELAY
(a) Remove the No.2 radiator fan relay. (Marking:
A.B.S.(TRAC) RELAY)
(b) Inspect the No. 2 radiator fan relay continuity.
(1) Using an ohmmeter, check that there is continuity
between terminals 1 and 6.
If there is no continuity, replace the relay.
(2) Check that there is continuity between terminals 3
and 5.
If there is no continuity, replace the relay.
(c) Check that there is no continuity between terminals 2 and
5.
If there is continuity, replace the relay.
(d) Inspect the No.2 radiator fan relay operation.
(e) Apply battery positive voltage across terminals 1 and 6.
(1) Using an ohmmeter, check that there is no continu-
ity between terminals 3 and 5.
(2) If there is continuity, replace the relay.
(3) Check that there is continuity between terminals 2
and 5.

Position of Parts in Engine Compartment
[2JZ-GTE]
R 1 Radiator Fan Motor No.1
R 2 Radiator Fan Relay No.1
R 3 Radiator Fan Relay No.2
R20 Radiator Fan Motor No.2
S 1 SFI Resistor
S 2 Starter
S 3 Starter
S 5 Sub Throttle Position Sensor
S18 Sub Throttle Valve Motor
T 1 Theft Deterrent Horn
T 2 Throttle Position Sensor
T14 Turbo Pressure Sensor
V 2 VSV (EGR)
V 3 VSV (EVAP)
V 4 VSV (Exhaust Bypass Valve)
V 5 VSV (Exhaust Gas Control Valve)
V 6 VSV (Fuel Pressure Up)
V 7 VSV (Intake Air Control Valve)
V 8 VSV (Waste Gate Valve)
V10 Vehicle Speed Sensor No.1 (Combination Meter)
V11 Vehicle Speed Sensor No.2 (Electronically
Controlled Transmission)
W 1 Washer Motor I 1 Idle AIr Control Valve
I 2 Igniter
I 3 Igniter
I 6 Ignition Coil No.1
I 7 Ignition Coil No.2
I 8 Ignition Coil No.3
I 9 Ignition Coil No.4
I10 Ignition Coil No.5
I11 Ignition Coil No.6
I12 Injector No.1
I13 Injector No.2
I14 Injector No.3
I15 Injector No.4
I16 Injector No.5
I17 Injector No.6
K 1 Knock Sensor (on Front Side)
K 2 Knock Sensor (on Rear Side)
M 1 Mass Air Flow Meter
N 1 Noise Filter
O 1 O/D Direct Clutch Speed Sensor
O 2 Oil Pressure SW
P 1 PPS Solenoid
P 2 Park/Neutral Position SW, Back-Up Light SW and
A/T Indicator Light SW (A/T)
P13 Parking Light LH
25
G

FRONT TURN SI GNAL
LIGHT RH AND
PARKING LIGHT RH
EFI NO. 2 RELAY
EFI MAIN RELAY
HE ATER RELAY
FRONT WIPER MOTOR
A/C CONDENSER FAN
MOTOR BRAKE FLUID LEVEL
WARNING SW
COMBINATION METER
ENGINE OIL
LEVEL SENSOR
NOISE FILTER
IGNITER PARKING LIGHT LH FRONT SIDE MARKE R
LIGHT LHDAYTIME
RUNNING
LIGHT RELAY
NO. 3
FRONT FOG LIGHT RH
EN GI NE H OOD
COURTESY SW
FR ON T TU RN S I G NA L
LIGHT LH
FRONT SIDE MA RKER
LIGHT RH
HE A DL I GHT LO R H
HEADLIGHT LO LH
ABS RELAY
A/ C DUAL PRESSURE
SW
ABS SOLENOID
RE LA Y
ABS ACTUATOR E 2
E 5 E 2 E 2 2
2
2
5
EB EA
HEATED OXYGEN
SEN SOR
(
BANK 1 SENSOR 2)
HEATED OXYGEN
SEN SOR
(
BANK 1 SENSOR 1)
ED EC II1 24
I17 E14I 2
IJ 1 18
(
E1)
(
E01)
(
E02) IC18 W- B
W- B
W- B
W- B W- BW- B
W- B
W- B
W- B
W- B
W- B
BR
BR
BR
BRBR W- B
W- B W- B
(
*3)W- B
(
*1)
W- B
(
*4)
W- B
W- B
W- B
W- B
W- B
W- BW- B
BR BR
BR
BR
BR
BR BR
BR BR
BR
W- B
(
*3)W- B
W- B
(
*3) E 7 : * 3
E20 : * 4E 2 : * 3
E18 : * 4E 2 : * 3
E18 : * 4
E 2 : * 3
E18 : * 4
E 5 : * 3
E19 : * 4
DA YTIME RUNNING
LIGHT RELAY
NO. 3 RA DIATOR FAN MOTOR
NO. 1
E11 : * 3
E24 : * 4W- B
W- B
W- B W- B
W- B
(
*1)E 2 : * 3
E18 : * 4
W- B
(
*3)
DA TA L I NK
CONNECTOR 2RADIATOR FAN
RELAY NO. 2 (
E) ENGI NE CO OLA NT TE MP .
SW
(
-S)
E 2 W- B
W- B W- B W- B W- B
W- B
W- B
BR E 2 : * 3
E18 : * 4
E 2
W- B
(
*1) (
*3)(
*3)(
*3)
(
*3)(
*3)
(
*3)
(
*3)ENGI NE CONTROL
MODULE W- B
BR
DA TA L I NK
CONNECTOR 1
DA TA LINK
CONNECTOR 3IJ15
BR
(
*4)
BR
(
*4)
E 9 : * 3
E21 : * 4
RA DIATOR FAN MOTOR
NO. 2W- B
(
*3) FRONT FOG LIGHT LH
W- B
THROTTLE
ECUDA TA L INK
CONNECTOR 3 BR
BR
BRBR
(
E03) BR (
*3)
W- B (
*3) (
E1)
(
E01)W- BW- B
(
*2) E 2
W- B
(
*1) W- B
(
*1)
IJ15
(
*3)
BR
BR
240
J GROUND POINT

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

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

IG1 16 IG113 IG115 IG114 IF1 10
I25
I25
B 8B19 B20 B17 C16 C4C10 C11 C1C2 A 1A6A18 A5B6B3B4 A 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- DEFL- F/D
L- FOOTL- B/ L
L- FACE AIR INLET CONTROL SERVO MOTOR A24HEATER CONTROL SWB H12 , H13A
A/C AMPLIFIERA A12 , A13
CRR-
DEFOG DEF F/ D FOOT B/ L FACE
B , A14
MRECIRC
FRESH
232
RADIATOR FAN AND AUTOMATIC