TOYOTA SUPRA 1995 Service Repair Manual

PPS ECU INSPECTION
1. JACK UP VEHICLE AND SUPPORT IT ON STANDS
2. START ENGINE
3. MEASURE VOLTAGE OF ECU
(a) Using a voltmeter, measure the voltage between ECU
terminals SOL  and GND while the engine is idling.
Standard voltage:
0.15±0.20 V
(b) Place the transmission in gear and while running at about 37
mph (60 km/h), measure the voltage between ECU terminals
SOL  and GND.
Standard voltage:
Voltage measured in (a) above, minus
2JZ±GE: 0.02±0.08 V
2JZ±GTE: 0.01±0.07 V
If no voltage, try another ECU.
4. LOWER VEHICLE SR±50
± STEERINGELECTRONIC CONTROL SYSTEM

SERVICE SPECIFICATIONS
SERVICE DATA
 Steering wheel freeplay Maximum 30 mm (1.18 in.)
 STEERING COLUMN 
  Pawl stopper Mark 
 1 or A 12.68±12.74 mm (0.4992±0.5016 in.)
 2 or B 12.61±12.67 mm (0.4965±0.4988 in.)
 3 or C 12.54±12.60 mm (0.4937±0.4961 in.)
 4 or D 12.47±12.53 mm (0.4909±0.4933 in.) 5 or E 12.40±12.46 mm (0.4882±0.4906 in.) 6 or F 12.33±12.39 mm (0.4854±0.4878 in.) 
7 or G
 
12.26±12.32 mm (0.4827±0.4850 in.) 
 PS ON±VEHICLE INSPECTION
 
 
  Maximum rise of oil level Below 5 mm (0.20 in.)
  Oil pressure at idle speed with valve closed Minimum 7,845 kPa (80 kgf/cm2, 1,140 psi)
  Steering effort at idle speed Maximum 0.4 NVm (3.6 kgfVcm, 3.1 in.Vlbf)
 PS VANE PUMP 
  Rotor shaft bushing oil clearance STD 0.03±0.05 mm (0.0012±0.0020 in.)
  Rotor shaft bushing oil clearance Maximum 0.07 mm (0.0028 in.)
  Vane plate to rotor groove clearance Maximum 0.03 mm (0.0012 in.)  Vane plate height Minimum 8.6 mm (0.339 in.)  Vane plate thickness Minimum 1.40 mm (0.0551 in.) 
  Vane plate length Minimum
 
 14.99 mm (0.5902 in.)
  Vane plate length Rotor and cam ring mark 
 NONE 14.999±15.001 mm (0.59051±0.59059 in.)
 1 14.997±14.999 mm (0.59043±0.59051 in.)
 2 14.995±14.997 mm (0.59035±0.59043 in.)
 3 14.993±14.995 mm (0.59027±0.59035 in.)
 4 14.991±14.993 mm (0.59020±0.59027 in.)
 Flow control spring length Minimum 33 mm (1.30 in.)
 Pump rotating torque 0.2 NVm (2.5 kgfVcm, 2.2 in.Vlbf) or less PS GEAR HOUSING 
 Steering rack runout Maximum 0.30 mm (0.0118 in.) 
 Total preload
 
 1.0±1.9 NVm (10±20 kgfVcm, 8.7±17.4 in.Vlbf)
 Solenoid valve resistance 6±11

± STEERINGSERVICE SPECIFICATIONSSR±51

TORQUE SPECIFICATIONS
 Part tightened NVm kgfVcm ftVlbf
 STEERING COLUMN   
  Steering wheel set nut 35 360 26  Steering wheel pad set screw 7.1 72 62 in.Vlbf  Column assembly set nut 25 260 19 
 Intermediate shaft x Sliding yoke
 
35
 
360
 
26 
  Tilt memory bolt x Square nut
 
 6.4
 
 65
 
 56 in.Vlbf
  Tilt lever assembly set screw 4.7 48 42 in.Vlbf
  Tilt pawl set nut 5.9 60 52 in.Vlbf
  Tilt lever retainer set nut 15 150 11
  Tilt memory bolt set nut 5.9 60 52 in.Vlbf
  Turn signal bracket set bolt 8.8 90 78 in.Vlbf
  Sliding yoke 35 360 26
  Compression set screw 6.4 65 56 in.Vlbf PS VANE PUMP   
  PS vane pump set bolt 58 590 42 
  Union bolt
 
 49
 
 500
 
 36
  Vane pump pulley set nut 43 440 32
  Front housing x Rear housing 17 170 12
  Pressure port union 83 850 61
  Oil reservoir set bolt (2JZ±GE) Front side bolt 13 130 9
 Rear side bolts 17 170 12
  Suction port union set bolt (2JZ±GTE) 13 130 9
 PS GEAR HOUSING   
  Tie rod end x Steering knuckle 49 500 36  Control valve shaft x Intermediate shaft 35 360 26  Pressure feed and return tube set union bolts 49 500 36 
  Gear housing set bolt and nut
 
 75
 
 770
 
 55
  Pressure control valve assembly x Control valve housing 18 185 13
  Control valve housing set bolt 18 185 13
  Self±locking nut 39 400 29
  Rack housing cap 69 700 501
  Rack guide spring cap lock nut 56 567 41
  Rack end 90 914 66
  Tie rod end lock nut 56 570 41  Turn pressure tube union nut 24 243 17  Turn pressure tube union bolt 34 350 25
SR±52± STEERINGSERVICE SPECIFICATIONS

SUPPLEMENTAL RESTRAINT SYSTEM
RS±1

GENERAL DESCRIPTION
The SUPRA is equipped with an SRS (Supplemental Restraint System), which comprises a driver
airbag, and front passenger airbag if fitted. Failure to carry out service operations in the correct
sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a seri-
ous accident. Further, if a mistake is made in servicing the SRS, it is possible the SRS may fail to
operate when required. Before performing servicing (including removal or installation of parts, in-
spection or replacement), be sure to read the following items carefully, then follow the correct pro-
cedure described in the repair manual.
1. Malfunction symptoms of the SRS are difficult to confirm, so the diagnostic trouble codes become the most
important source of information when troubleshooting. When troubleshooting the SRS, always inspect the
diagnostic trouble codes before disconnecting the battery.
(See page RS±44)
2. Work 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.
(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 from the battery, the SRS may deploy.)
When the negative (±) terminal cable is disconnected from the battery, memory of the clock and audio sys-
tems will be canceled. So before starting work, make a record of the contents memorized by the audio
memory system. When work is finished, reset the audio systems as before and adjust the clock. To avoid
erasing the memory of each memory system, never use a back±up power supply from outside the vehicle.
3. Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front passenger
airbag assembly, front airbag sensors and center airbag sensor assembly should be inspected.
(See pages RS±10, 20, 30, and 33)
4. Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.
5. Before repairs, remove the airbag sensors if shocks are likely to be applied to the sensors during repairs.
6. Never disassemble and repair the steering wheel pad, front passenger airbag assembly, front airbag
sensors or center airbag sensor assembly in order to reuse it.
7. If the steering wheel pad, front passenger airbag assembly, front airbag sensors or center airbag sensor
assembly have been dropped, or if there are cracks, dents or other defects in the case, bracket or
connector, replace them with new ones.
8. Do not expose the steering wheel pad, front passenger airbag assembly, front airbag sensors or center
airbag sensor assembly directly to hot air or flames.
9. Use a volt/ohmmeter with high impedance (10 k
/V minimum) for troubleshooting the system's electrical
circuits.
10. Information labels are attached to the periphery of the SRS components. Follow the instructions on the
notices.
11. After work on the SRS is completed, check the SRS warning light.
(See page RS±44)
12. If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section. RS±2
± SUPPLEMENTAL RESTRAINT SYSTEMGENERAL DESCRIPTION

DESCRIPTION
This vehicle is equipped with an SRS (Supplemental Re-
straint System) which comprises a driver airbag, and front
passenger airbag if fitted. Where fitted, it is designed to be of
benefit only in conjunction with the front seat belt(s) being
worn. In a collision, if the shock is greater than a specified val-
ue, the airbag(s) stored in the steering wheel pad and front
passenger airbag assembly are inflated instantaneously.
LOCATION OF COMPONENTS
± SUPPLEMENTAL RESTRAINT SYSTEMDESCRIPTIONRS±3

OPERATION
FUNCTION OF COMPONENTS
1. STEERING WHEEL PAD (with AIRBAG)
The inflater and bag of the SRS are stored in the steering
wheel pad and cannot be disassembled. The inflater con-
tains a squib, igniter charge, gas generant, etc., and inflates
the bag when instructed by the center airbag sensor assem-
bly.
2. SPIRAL CABLE (in COMBINATION SWITCH)
A spiral cable is used as an electrical joint from the vehicle
body side to the steering wheel.
3. FRONT PASSENGER AIRBAG ASSEMBLY
The inflater and bag of the SRS are stored in the front pas-
senger airbag assembly and cannot be disassembled.
The inflater contains a squib, igniter charge, gas generant,
etc., and inflates the bag when instructed by the center airbag
sensor assembly.
4. SRS WARNING LIGHT
The SRS warning light is located on the cluster finish panel.
It goes on to alert the driver of trouble in the system when a
malfunction is detected in the center airbag sensor assembly.
In normal operating conditions when the ignition switch is
turned to the ACC or ON position, the light goes on for about
6 seconds and then goes off.
5. FRONT AIRBAG SENSOR
A front airbag sensor is mounted inside each of the front fend-
ers. The sensor unit is a mechanical type. When the sensor
detects a deceleration force above a predetermined limit,
contacts is made in the sensor, sending a signal to the center
airbag sensor assembly. The sensor cannot be disas-
sembled. RS±4
± SUPPLEMENTAL RESTRAINT SYSTEMOPERATION

6. CENTER AIRBAG SENSOR ASSEMBLY
The center airbag sensor assembly is mounted on the floor
inside the console box. The center airbag sensor assembly
consists of a center airbag sensor, safing sensor, diagnosis
circuit and ignition control, drive circuit, etc. It receives signals
from the airbag sensors and judges whether the SRS must
be activated or not.
7. SRS CONNECTORS
 No. Item Application 
 (1)
 
  Terminal Twin±Lock Mechanism
 
  Connectors (1), (2), (3), (4), (5), (6), (7)
 (2)  Airbag Activation Prevention Mechanism  Connectors (1), (4), (5), (6)
 (3)  Electrical Connection Check Mechanism  Connectors (1), (2), (3)
 (4)  Connector Twin±Lock Mechanism  Connectors (4), (5), (6)
All connectors in the SRS are colored yellow to distinguish
them from other connectors. Connectors having special func-
tions and specifically designed for SRS are used in the loca-
tions shown below to ensure high reliability. These connec-
tors use durable gold±plated terminals.
± SUPPLEMENTAL RESTRAINT SYSTEMOPERATIONRS±5

(1) Terminal Twin±Lock Mechanism
Each connector has a two±piece construction consisting of
a housing and a spacer. This design secures the locking of
the terminal by two locking devices (the spacer and the lance)
to prevent terminals from coming out.
(2) Airbag Activation Prevention Mechanism
Each connector contains a short spring plate. When the con-
nector is disconnected, the short spring plate automatically
connects the power source and grounding terminals of the
squib.
HINT: The illustration shows connectors (4), (5) and (6). Con-
nector (1) has short spring plates on the female terminal side. RS±6
± SUPPLEMENTAL RESTRAINT SYSTEMOPERATION

`
(3) Electrical Connection Check Mechanism
This mechanism is designed to electrically check if connec-
tors are connected correctly and completely. The electrical
connection check mechanism is designed so that the con-
nection detection pin connects with the diagnosis terminals
when the connector housing lock is in the locked condition.
(4) Connector Twin±Lock Mechanism
With this mechanism the male and female connectors are
locked by two locking devices to increase connection reliabil-
ity. If the primary lock is incomplete, ribs interfere and prevent
the secondary lock.
± SUPPLEMENTAL RESTRAINT SYSTEMOPERATIONRS±7