TOYOTA SUPRA 1995 Service Repair Manual

TC Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that diagnostic code output is required.
WIRING DIAGRAM
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±199

INSPECTION PROCEDURE
Check for open and short in harness and connector between ECU and TDCL,
TDCL and body ground. (See page IN±30).
Repair or replace harness or connector.
Check and replace ECU.
Voltage: 10 ± 14 V
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
(1) Turn ignition switch ON.
(2) Measure voltage between terminals Tc and E1 of
DCL.
Check voltage between terminals Tc and E1 of DLC.
BE±200± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM

SERVICE SPECIFICATIONS
SERVICE DATA
  INTEGRATION RELAY (Light Auto Cut System) 
  B2 ± Ground (Constant) Battery positive voltage
  B3 ± Ground (Constant) Battery positive voltage
  A7 ± Ground (Ignition SW position LOCK or ACC) No voltage 
 A7 ± Ground (Ignition SW position ON)
 
Battery positive voltage 
  A1 ± Ground (Constant)
 
 Battery positive voltage
  DAYTIME RUNNING LIGHT MAIN RELAY (Wire Harness Side) 
  2 ± Ground (Ignition SW position LOCK or ACC) No voltage
  2 ± Ground (Ignition SW position ON) Battery positive voltage  11 ± Ground (Engine stop) No voltage 
  11 ± Ground (Engine running)
 
 Battery positive voltage
  15 ± Ground (Constant) Battery positive voltage
  17 ± Ground (Constant) Battery positive voltage
  TURN SIGNAL FLASHER 
  Flashes/Minute 60 ± 120 
  INTEGRATION RELAY (Interior Light System)
 
 
  9 ± Ground (Ignition SW position LOCK or ACC) No voltage
  9 ± Ground (Ignition SW position ON) Battery positive voltage
  1 ± Ground (Constant) Battery positive voltage
  SPEEDOMETER (USING A SPEEDOMETER TESTER) 
 
Standard indication (mph)
 
Allowable range (mph) 
 20
 
 18 ± 24
 40 38 ± 44
 60 58 ± 66
 80 78 ± 88 100 98 ± 110 
 120
 
 118 ± 132
 Standard indication (km/h) Allowable range (km/h)
 20 17 ± 24
 40 38 ± 46
 60 57.5 ± 67 
 80
 
 77 ± 88
 100 96 ± 109
 120 115 ± 130
 140 134 ± 151.5
 160 153 ± 173
± BODY ELECTRICAL SYSTEMSERVICE SPECIFICATIONSBE±201

  TACHOMETER (ON±VEHICLE) 
 Standard indication (rpm) Allowable range (rpm)
 700 630 ± 770
 1000 915 ± 1115
 2000 1920 ± 2220
 3000 2890 ± 3350
 4000 3940 ± 4400
50005025 ± 5425 
6500
 
6650 ± 6950 
7000
 
7025 ± 7625  OD/TRIP METER (CONNECTOR CONNECTED) 
  1 ± Ground (Ignition SW position ON) Battery positive voltage  4 ± Ground (Light Control SW position TAIL or HEAD) Battery positive voltage  5 ± 7 (Ignition SW ON and drive the vehicle slowly) OV eBattery positive voltage  6 ± 7 (Ignition SW ON and drive the vehicle slowly) OV emore than 5V  8 ± Ground (Constant) Battery positive voltage 
 
 
10 ± Ground (Ignition SW ON, Light Control SW TAIL or
HEAD and turn the Light Control Rheostat
knob to clockwise) 
 
 6V " 0V
  FUEL RECEIVER GAUGE 
 A ± B Approx. 269.7

 A ± C Approx. 123.5

 B ± C Approx. 146.2

  FUEL SENDER GAUGE 
  Float position: F Approx. 4.0

  Float position: 1/2 Approx. 55.0

  Float position: E Approx. 107.0

  ENGINE COOLANT TEMPERATURE RECEIVER GAUGE 
 A ± B Approx. 229.7

 A ± C Approx. 54.0

 B ± C Approx. 175.7

  ENGINE COOLANT TEMPERATURE SENDER GAUGE 
  50 °C (122.0 °F) 160 ± 240

  120 °C (248.0 °F) 17.1 ± 21.2

  LIGHT FAILURE SENSOR 
  3 ± Ground (Light Control SW position OFF) No voltage
  3 ± Ground (Light Control SW position TAIL or HEAD) Battery positive voltage
  4 ± Ground (Ignition SW position LOCK or ACC) No voltage
  4 ± Ground (Ignition SW position ON) Battery positive voltage
  7 ± Ground (Stop Light SW position OFF) No voltage
  7 ± Ground (Stop Light SW position ON) Battery positive voltage
 8 ± Ground (Engine stop)No voltage 
8 ± Ground (Engine running)
 
Battery positive voltage 
INTEGRATION RELAY (Seat Belt Warning)
 
  1 ± Ground (Constant) Battery positive voltage  9 ± Ground (Ignition SW LOCK or ACC) No voltage  9 ± Ground (Ignition SW ON) Battery positive voltage
BE±202± BODY ELECTRICAL SYSTEMSERVICE SPECIFICATIONS

  ANTENNA MOTOR CONTROL RELAY (Wire Harness Side) 
  1 ± Ground (Constant) Battery positive voltage
  4 ± Ground (Ignition SW position ON) Battery positive voltage 
  5 ± Ground (Ignition SW position ACC or ON)
 
 Battery positive voltage
  7 ± Ground (Ignition SW position ACC or ON and radio SW ON) Battery positive voltage
  8 ± Ground (Ignition SW position ACC or ON) Battery positive voltage
± BODY ELECTRICAL SYSTEMSERVICE SPECIFICATIONSBE±203

BODY
BO±1

GENERAL INFORMATION
HANDLING PRECAUTIONS
Taping
When it is possible that the body or parts may be scratched
during the operation, apply protective tape before starting
work.
Example:
1. Before starting work, apply protective tape to body
surfaces around parts to be removed and installed.
2. Before prying parts loose with a screwdriver or scraper
etc., apply protective tape to the tip of the tool to avoid
scratching parts or painted surfaces of the body.
Battery
In order to prevent a short circuit while doing work on the elec-
trical circuit such as disconnecting a connector, first turn off
the ignition switch and disconnect the negative (±) terminal
cable from the battery before starting work.
HINT: When battery voltage is required for operation of a
functioning part, connect the cable to the battery when need-
ed, and promptly disconnect it when no longer necessary.
CAUTION:
wWork must be started after 90 seconds from the time the
ignition switch is turned to the ºLOCKº position and the
negative (±) terminal cable is disconnected from the
battery.
wTo avoid erasing the memory of each memory system,
never use a back±up power supply from outside the
vehicle.
Fitting Adjustments
When removing and installing body panels which have a pre-
load value, after installation refer to the page containing the
installation adjustment methods, and make adjustments ac-
cording to the required specifications.
HINT: When making adjustments, do not completely loosen
the bolts and nuts of the part being adjusted. Tighten them
appropriately, and move the panels by hand to align them. BO±2
± BODYGENERAL INFORMATION

CLIPS
The removal and installation methods of typical clips used in
body parts are shown in the table below.
HINT: If the clip is damaged during the operation, always re-
place it with a new clip.
± BODYGENERAL INFORMATIONBO±3

CLIPS (Cont'd)
BO±4± BODYGENERAL INFORMATION

SRS (Supplemental Restraint System)
The 1995 SUPRA is equipped with an SRS, such as the driver airbag and front passenger airbag assembly.
Failure to carry out service operations in the correct sequence could cause the SRS to deploy, possibly
leading to a serious accident.
When removing or installing of airbag parts and the yellow wire harness and connector for the airbag is
necessary, refer to the precautionary notices in the RS section before performing the operation.
wWork must be started after 90 seconds from the time the ignition switch is set to the LOCK position
and the negative (±) terminal cable is disconnected from the battery.
(The SRS is equipped with a back±up power source so that if work is started within 90 seconds of
disconnecting the negative (±) terminal cable of the battery, the SRS may deploy.)
wTo avoid erasing the memory of each memory system, never use a back±up power supply from
outside the vehicle.
wBefore repairs, remove the airbag sensors if shocks are likely to be applied to the sensors during
repairs.
wThe front airbag sensor set bolt has been anti±rust treated. When the sensor is removed, always
replace the set bolt with a new one.
wIf the front airbag sensors, center airbag sensor assembly, steering wheel pad or front passenger
airbag assembly have been dropped, or if there are cracks, dents or other defects in the case, bracket
or connector, replace them with new ones.
wNever use SRS parts from another vehicle. When replacing parts, replace them with new parts.
wDo not expose the front airbag sensors, center airbag sensor assembly, steering wheel pad or front
passenger airbag assembly directly to hot air or flames.
wThe SRS wire harness is integrated with the cowl wire harness assembly. The wires for the SRS wire
harness are encased in a yellow corrugated tube. All the connectors for the system are also a standard
yellow color. If the SRS wire harness becomes disconnected or the connector becomes broken due
to an accident, etc., repair or replace it. (See RS section)
wThe steering wheel must be fitted correctly to the steering column with the spiral cable at the neutral
position; otherwise, cable disconnection and other troubles may result. Refer to RS section of this
manual concerning correct steering wheel installation.
wWhen removing or handling the steering wheel pad or front passenger airbag assembly, it should be
placed with their top surface facing up. In this case, the twin±lock type connector lock lever should
be in the locked state and care should be taken to place it so the connector will not be damaged.
(Storing the pad with its metallic surface up, the front passenger airbag assembly with the airbag door
facing down may lead to a serious accident if the airbag inflates for some reason.)
wGrease should not be applied to the steering wheel pad or the front passenger airbag assembly, and
they should not be cleaned with detergents of any kind.
wStore the steering wheel pad or the front passenger airbag assembly where the ambient temperature
remains below 93°C (200°F), without high humidity and away from electrical noise.
wInformation labels are attached to the periphery of the SRS components. Follow the notices.
wWhen the ignition switch is at ACC or ON and the SRS warning light remains on, the center airbag
sensor assembly has detected a malfunction code. (See RS section)
± BODYGENERAL INFORMATIONBO±5