1986 TOYOTA SUPRA heater

29
Position of Parts in Instrument Panel
E 8 Electronically Controlled Transmission Pattern O 5 O/D Main SW and A/T Indicator Light (for Shift
Select SW Lever)
E 9 Engine Control Module (Engine and Electronically
Controlled Transmission ECU) P 4 PPS ECU
E 10 Engine Control Module (Engine and Electronically P 5 Parking Brake SW
Controlled Transmission ECU)
E 11 Engine Coolant Temp. Sensor (Water Temp. Sensor) R 4 Radio and Player (w/o Stereo Power Amplifier)
(for A/C System) R 5 Radio and Player (w/o Stereo Power Amplifier)
R 6 Radio and Player (w/ Stereo Power Amplifier)
F 10 Front Tweeter (Speaker) LH R 7 Remote Control Mirror SW
F 11 Front Tweeter (Speaker) RH R 8Rheostat
G 3 Glove Box Light S 6 Seat Heater SW
G 4 Glove Box Light SW S 7 Shift Lock ECU
S 8 Stereo Power Amplifier
H 10 Hazard SW S 9 Stereo Power Amplifier
H 11 Heated Oxygen Sensor (Sub) S 10 Stereo Power Amplifier
H 12 Heater Control SW S 11 Stop Light SW
H 13 Heater Control SW S 16 Sub Heated Oxygen Sensor
(for California)
I 18 Ignition Key Cylinder Light
I 19 Ignition SW T 5 Telltale Light LH
I 20 Integration Relay T 6 Telltale Light RH
T 7 Theft Deterrent ECU
J 1 Junction Connector T 8 TRAC Off SW
J 2 Junction Connector T 9 Traction ECU
T 10 Traction ECU
K 3 Key Interlock Solenoid T 13 Theft Deterrent ECU
K 4 Kick Down SW
U 1 Unlock Warning SW
N 2 Noise Filter

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ELECTRICAL WIRING ROUTING
Position of Parts in Body
A 31 ABS Speed Sensor Rear LH N 3 Noise Filter
A 32 ABS Speed Sensor Rear RH
A 33 Auto Antenna Motor P 6 Personal Light
P 7 Power Window Control SW RH
D 10 Door Courtesy SW LH P 8 Power Window Master SW and Door Lock Control
D 11 Door Courtesy SW RH SW LH
D 12 Door Key Lock and Unlock SW LH P 9 Power Window Motor LH
D 13 Door Key Lock and Unlock SW RH P 10 Power Window Motor RH
D 14 Door Lock Control SW RH
D 15 Door Lock Motor and Door Unlock Detection SW LH R 9 Rear Combination Light LH
D 16 Door Lock Motor and Door Unlock Detection SW RH R 10 Rear Combination Light RH
R 11 Rear Side Marker Light LH
F 12 Front Door Speaker LH R 12 Rear Side Marker Light RH
F 13 Front Door Speaker RH R 13 Rear Speaker LH
F 14 Fuel Pump and Sender R 14 Rear Speaker RH
F 15 Fuel Pump ECU R 15 Rear Wiper Motor and Relay
R 16 Remote Control Mirror and Mirror Heater LH
H 14 High Mounted Stop Light R 17 Remote Control Mirror and Mirror Heater RH
R 18 Rear Window Defogger (+)
L 1 License Plate Light R 19 Rear Window Defogger (±)
L 2 Light Failure Sensor
L 3 Luggage Compartment Key Unlock SW T 11 Tension Reducer Solenoid LH
L 4 Luggage Compartment Light T 12 Tension Reducer Solenoid RH
L 5 Luggage Compartment Light SW
W 2 Woofer (Speaker)

31
Position of Parts in Seat
P 11 Power Seat Control SW (for Driver's Seat) S 13 Seat Heater (for Passenger's Seat)
P 12 Power Seat Motor (for Driver's Seat Slide Control) S 14 Seat Heater Relay (for Driver's Seat)
S 15 Seat Heater Relay (for Passenger's Seat)
S 12 Seat Heater (for Driver's Seat)

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Connector Joining Wire Harness and Wire Harness
CODEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IG1INSTRUMENT PANEL WIRE AND COWL NO. 3 WIRE (BEHIND HEATER CONTROL SW)
IH1
IH2INSTRUMENT PANEL WIRE AND CONSOLE BOX WIRE (UNDER THE INSTRUMENT PANEL BRACE RH)
IH3
INSTRUMENT PANEL WIRE AND CONSOLE BOX WIRE (UNDER THE INSTRUMENT PANEL BRACE RH)
II1ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
IJ1ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)IJ2ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)
IK1COWL NO. 4 WIRE AND COWL WIRE (RIGHT KICK PANEL)
IL1FRONT DOOR RH WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)

49
F14 220
Fuel Pump and Sender
F15 G2 G3 G4 H1 H2 H3 H4 H5 H8 H9 H10 H11 H12 H14 I1 I18 I20 K3 L1 L2 L4 L5 M1 M2 M3 N2 70
8268 122 12294
9694
9694
9694
9670 129 129111
12270122
22811 470
8211 8 94
102 96
108
122184 102102
11 411 8 11 8 70
14082 82 208
Fuel Pump ECU
Generator (Alternator)
Glove Box Light
Glove Box Light SW
Headlight Hi LH
Headlight Hi RH
Headlight Lo LH
Headlight Lo RH
Heated Oxygen Sensor (Main)
Horn LH
Horn RH
Hazard SW
Heated Oxygen Sensor (Sub)
Heater Control SW
High Mounted Stop Light
Idle Air Control Valve
(ISC Valve)
Ignition Key Cylinder Light
Integration Relay
Key Interlock Solenoid
License Plate Light
Light Failure Sensor
Luggage Compartment
Light
Luggage Compartment
Light SW
Mass Air Flow
(Air Flow Meter)
Main Heated Oxygen Sensor
(for California, on Front Side)
Main Heated Oxygen Sensor
(for California, on Rear Side)
Noise Filter
(4): R/B No. 5 (See page 20)
23

51
R9 111
Rear Turn Signal Light LH
[Rear Comb. Light LH]
R10 R11 R12 R15 R16 R17 R18 S3 S6 S7 S8 S9 S11 S12 S13 S14 S15 S16 T1 T3 T4 T5 114 102 116 111 114 102 102 102 203188
208188
20820860
64122
192184210
214210
70
11 4
150
164 82
140
159
174
184192 192 192 192 82 130 164 164 159
Stop Light LH
[Rear Comb. Light LH]
Taillight LH
[Rear Comb. Light LH]
Back±Up Light RH
[Rear Comb. Light RH]
Rear Turn Signal Light RH
[Rear Comb. Light RH]
Stop Light RH
[Rear Comb. Light RH]
Taillight RH
[Rear Comb. Light RH]
Rear Side Marker Light LH
Rear Side Marker Light RH
Rear Wiper Motor and Relay
Remote Control Mirror and
Mirror Heater LH
Remote Control Mirror and
Mirror Heater RH
Rear Window Defogger (+)
Starter
Seat Heater SW
Shift Lock ECU
Stereo Power Amplifier
Stereo Power Amplifier
Stop Light SW
Seat Heater
(for Driver's Seat)
Seat Heater
(for Passenger's Seat)
Seat Heater Relay
(for Driver's Seat)
Seat Heater Relay
(for Passenger's Seat)
Sub Heated Oxygen Sensor
(for California)
Theft Deterrent Horn
Traction Brake Actuator
Traction Pump and Motor
ABS Indicator Light
[Telltale Light LH]
(4): R/B No. 5 (See page 20)
23

53
70
VSV (for Waste Gate Valve)
V10 V8
W1
Vehicle Speed Sensor
(Speed Sensor) No. 1
(For Combination Meter)
Washer Motor
Integration Relay
Power Main Relay
Taillight Relay
A/C Magnetic Clutch Relay
EFI Main Relay
EFI No. 2 Relay
Fog Light Relay
Headlight Relay
Heater Relay
Horn Relay
Starter Relay
Diode
Rear Window Defogger Relay
Turn Signal Flasher
ABS Motor Relay
ABS Solenoid Relay
Traction Motor Relay
Traction Solenoid Relay
70
140
174
220 82
150
181
228126
203108
11 8
194136102
108
122
130228 70
82
140
15070 106 94
96
108
130228129
130 60
64
130164
220208
228111 164 164 164 164
: R/B No. 5 (See page 20)
23

71
2. CONTROL SYSTEM
*SEQUENTIAL MULTIPORT FUEL INJECTION (ELECTRONIC FUEL INJECTION) SYSTEM
THE SEQUENTIAL MULTIPORT FUEL INJECTION (ELECTRONIC FUEL INJECTION) SYSTEM MONITORS THE ENGINE CONDITION
THROUGH THE SIGNALS INPUT FROM EACH SENSOR (INPUT SIGNALS FROM (1) TO (13) ETC.) TO THE ENGINE CONTROL
MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU). THE BEST FUEL INJECTION TIMING IS DECIDED
BASED ON THIS DATA AND THE PROGRAM MEMORIZED BY THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY
CONTROLLED TRANSMISSION ECU), AND THE CONTROL SIGNAL IS OUTPUT TO TERMINALS #10, #20, #30, 40, #50 AND #60 OF
THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) TO OPERATE THE
INJECTOR (INJECT THE FUEL). THE SEQUENTIAL MULTIPORT FUEL INJECTION (ELECTRONIC FUEL INJECTION) SYSTEM
PRODUCES CONTROLS OF FUEL INJECTION OPERATION BY THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY
CONTROLLED TRANSMISSION 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
(ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) FROM EACH SENSOR (INPUT SIGNALS FROM (1), (2), (4) TO
(13) ETC.). THE BEST IGNITION TIMING IS DECIDED ACCORDING TO THIS DATA AND THE MEMORIZED DATA IN THE ENGINE
CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) AND THE CONTROL SIGNAL IS OUTPUT
TO TERMINALS IGT1, IGT2, IGT3, IGT4, IGT5 AND IGT6 THESE SIGNALS CONTROL THE IGNITER TO PROVIDE THE BEST IGNITION
TIMING FOR THE DRIVING CONDITIONS.
*HEATED OXYGEN SENSOR HEATER CONTROL SYSTEM
THE MAIN HEATED OXYGEN SENSOR, SUB HEATED 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 TO
IMPROVE DETECTION PERFORMANCE OF THE SENSOR. THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY
CONTROLLED TRANSMISSION ECU) EVALUATES THE SIGNALS FROM EACH SENSOR (INPUT SIGNALS FROM (1), (2), (4), (9) TO
(11) ETC.), AND OUTPUTS CURRENT TO TERMINALS HT1, HT2 TO CONTROL THE HEATER.
*IDLE AIR CONTROL (IDLE SPEED CONTROL) SYSTEM
THE IDLE AIR CONTROL (ISC) SYSTEM (STEP MOTOR TYPE) INCREASES THE ENGINE SPEED AND PROVIDES IDLING 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 (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) EVALUATE THE
SIGNALS FROM EACH SENSOR (INPUT SIGNALS FROM (1), (4), (5), (8), (9), (11) ETC.), OUTPUTS CURRENT TO TERMINALS ISC1,
ISC2, ISC3 AND ISC4 TO CONTROL THE IDLE AIR CONTROL VALVE (ISC 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.
*FUEL PUMP CONTROL SYSTEM
THE ENGINE CONTROL MODULE (ENGINE AND ELECTRONICALLY CONTROLLED TRANSMISSION ECU) OUTPUTS CURRENT TO
TERMINAL FPC AND CONTROLS THE FUEL PUMP ECU AND FUEL PUMP DRIVE SPEED IN RESPONSE TO THE DRIVING
CONDITIONS.
3. DIAGNOSIS SYSTEM
WITH THE DIAGNOSIS SYSTEM, WHEN THERE IS A MALFUNCTION IN THE ENGINE CONTROL MODULE (ENGINE AND
ELECTRONICALLY CONTROLLED TRANSMISSION ECU) SIGNAL SYSTEM, THE MALFUNCTIONING SYSTEM IS RECORDED IN THE
MEMORY. THE MALFUNCTIONING SYSTEM CAN BE FOUND BY READING THE CODE DISPLAYED BY THE MALFUNCTION INDICATOR
LAMP (CHECK ENGINE WARNING LIGHT).
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 (ENGINE AND ELECTRONICALLY
CONTROLLED TRANSMISSION ECU) MEMORY OR ELSE STOPS THE ENGINE.