TOYOTA SUPRA 1995 Service Repair Manual

Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E1 of the DLC1 or DLC2, the center airbag sensor assembly is set in the diagnos-
tic trouble code output mode. The diagnostic trouble codes are displayed by the blinking of the SRS warning
light.
RS±98± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTING

Does SRS warning light light up for approx. 6 seconds?
Check operation of SRS warning light after ignition
switch turned from LOCK position to ACC or ON
position.
Check SRS warning light system.
(See page RS±44)
Check voltage between terminals Tc and E1 of DLC1 and DLC2.
Turn ignition switch to ACC or ON.
Measure voltage between terminals Tc and E
1 of
DLC1 or DLC2.
Voltage: Battery positive voltage
INSPECTION PROCEDURES [P] Preparation [C] Check
HINT: If the diagnostic trouble code is not displayed, do the following troubleshooting:
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±99

Check voltage between terminals Tc of DLC1 or DLC2 and body ground.
Measure voltage between terminals Tc of DLC1 or
DLC2 and body ground.
Voltage: Battery positive voltage
Check harness between terminals E1 of DLC1
or DLC2 and body ground.
Check center airbag sensor assembly.
(1) Turn ignition switch to LOCK.
(2) Disconnect negative (±) terminal cable from the
battery, and wait at least 90 seconds.
(3) Disconnect center airbag sensor assembly con±
nector.
(4) Insert test probe into terminal Tc from back side as
shown.
(5) Connect center airbag sensor assembly con±
nector with check pin.
(6) Connect negative (±) terminal cable to battery.
(7) Turn ignition switch to ACC or ON and wait at
least 20 seconds.
(8) Using service wire, connect test probe of termi±
nal Tc to body ground.
Check operation SRS warning light.
SRS warning light comes on.
NOTICE: Never made a mistake with the terminal
connection position as this will cause a malfunc-
tion.
Check harness between center airbag sensor
assembly and DLC1 or DLC2.
Replace center airbag sensor assembly. RS±100
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTING

HINT: If the diagnostic trouble code is displayed without a DTC check procedure, perform the following trouble-
shooting.
Repair or replace harness or connector.
Check resistance between terminal Tc of center airbag sensor assembly
and body ground.
(1) Turn ignition switch to LOCK.
(2) Disconnect negative (±) terminal cable from the
battery, and wait at least 90 seconds.
(3) Disconnect center airbag sensor assembly con±
nector.
Check resistance between terminal Tc of center airbag
sensor assembly connector and body ground.
Resistance: 1 M
or Higher
Replace center airbag sensor assembly.
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±101

SERVICE SPECIFICATIONS
SERVICE DATA
 
 FRONT AIRBAG SENSOR
 
 
 
S ±
A 755±885

 
S ± S 1 M
or Higher
 S ± A Less than 1

TORQUE SPECIFICATIONS
 
Part tightened 
NVm 
kgfVcm 
ftVlbf 
 Steering wheel
 
 35
 
 360
 
 26
 Steering wheel pad 7.1 72 62 in.Vlbf
 Front passenger airbag assembly x Instrument panel reinforcement 21 210 15
 Front passenger airbag assembly x Instrument panel 8.8 90 78 in.Vlbf 
 Front airbag sensor
 
 29
 
 300
 
 22
 Airbag sensor assembly 21 210 15
RS±102± SUPPLEMENTAL RESTRAINT SYSTEMSERVICE SPECIFICATIONS

SUSPENSION AND AXLE
SA±1

SA±3SA±3SA±4SA±21
SA±85SA±32
SA±96SA±32
SA±96SA±26,29
SA±89,92SA±13
SA±35SA±20
SA±83SA±3
See Page
Parts
Name
Trouble
Wander / pulls
Bottoming
Sways / pitches
Front wheel shimmy
Abnormal tire wear
Cold tire inflation pressureTiresWheel alignmentSpringsStabilizer barShock absorberBall jointHub bearingsSteering linkageSteering gearSuspension partsOverloadWheel balance
TROUBLESHOOTING
Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely
cause of the problem. Check each part in order. If necessary, replace these parts. SA±2
± SUSPENSION AND AXLETROUBLESHOOTING

GENERAL INSPECTION
1. INSPECT TIRE
(a) Check the tires for wear and for the proper inflation pressure.
Cold tire inflation pressure (2JZ±GE)
 
 Tire size 
 
Front
kPa (kgf/cm2, psi)
 
 
Rear
kPa (kgf/cm2, psi)
 225/50ZR16 230 (2.3, 33) ±±
 245/50ZR16 ±± 250 (2.5, 36)
Cold tire inflation pressure (2JZ±GTE)
 
 
Tire size 
 
Front
kPa (kgf/cm2, psi)
 
 
Rear
kPa (kgf/cm2, psi)
 235/45ZR17 250 (2.5, 36) ±±
 255/40ZR17 ±± 250 (2.5, 36)
(b) Check the tire runout.
Tire runout:
Less than 1.4 mm (0.055 in.)
2. INSPECT WHEEL BALANCE
(a) Check and adjust the Off±the±car balance.
(b) If necessary, check and adjust the On±the±car balance.
Unbalance after adjustment:
5.0 g (0.011 lb) or less
3. CHECK WHEEL BEARING LOOSENESS
(a) Check the backlash in bearing shaft direction.
Maximum: 0.05 mm (0.0020 in.)
(b) Check the axle hub deviation.
Maximum: 0.05 mm (0.0020 in.)
4. CHECK FRONT SUSPENSION FOR LOOSENESS
5. CHECK STEERING LINKAGE FOR LOOSENESS
6. CHECK BALL JOINT FOR LOOSENESS
7. CHECK SHOCK ABSORBER WORK PROPERLY
wCheck for oil leak
wCheck mounting bushings for wear
wBounce front and rear of the vehicle
± SUSPENSION AND AXLEGENERAL INSPECTIONSA±3

WHEEL ALIGNMENT
FRONT WHEEL ALIGNMENT
1. MEASURE VEHICLE HEIGHT
Front vehicle height
 Engine Tire size Height
 2JZ±GE 225/50ZR16 185 mm (7.28 in.)
 2JZ±GTE 235/45ZR17 187 mm (7.36 in.)
Measuring point:
Measure from the ground to the center of the lower suspen-
sion arm front mounting bolt.
NOTICE: Before inspecting the wheel alignment, adjust
the vehicle height to specification.
If the vehicle height is not to specification, try to adjust it by
pushing down on or lifting the body.
2. INSTALL CAMBER±CASTER±KINGPIN GAUGE OR
ONTO WHEEL ALIGNMENT TESTER
Follow the specific instructions of the equipment manufactur-
er.
3. INSPECT CAMBER, CASTER AND STEERING AXIS
INCLINATION
Specifications
  2JZ±GE 2JZ±GTE
 
 
Camber
Left±right error 
 
±0°20'+45'
30' or less 
 
±0°30'+45'
30' or less
 
 
Caster
Left±right error 
 
3°20'+45'
30' or less 
 
3°30'+45'
30' or less
 
 
Steering axis
inclination 
 
9°35'+45'
(Reference) 
 
9°45'+45'
(Reference)
If the steering axis inclination is not as specified, after camber
and caster have been correctly adjusted, recheck the steer-
ing knuckle front wheel for bearing or looseness.
4. INSPECT TOE±IN
Toe±in (total):
A+B: 0° + 0.2°
C±D: 0 + 2 mm (0 + 0.08 in.)
If toe±in is not within specification adjust by the tie rod end. SA±4
± SUSPENSION AND AXLEWHEEL ALIGNMENT

5. ADJUST CAMBER AND CASTER
(a) Remove the engine under cover.
(b) Remove the nut, 2 bolts and front lower arm bracket stay.
(c) Loosen the front and/or rear adjusting cam nuts.
(d) Adjust the camber and caster by front and/or rear adjusting
cams. (See adjustment chart)
Specifications
  2JZ±GE 2JZ±GTE
 Camber
Left±right error ±0°20' + 30'
30' or less ±0°30' + 30'
30' or less
 
 Caster
Left±right error 
 3°20' + 30'
30' or less 
 3°30' + 30'
30' or less
(e) Torque the front and/or rear adjusting cam nuts.
Torque: 226 NVm (2,300 kgfVcm, 166 ftVlbf)
(f) Install the front lower arm bracket stay.
Torque:
Nut: 43 NVm (440 kgfVcm, 32 ftVlbf)
Bolt: 59 NVm (600 kgfVcm, 43 ftVlbf)
(g) Install the engine under cover.
6. ADJUST TOE±IN
(a) Remove the boot clamps.
(b) Loosen the tie rod end lock nuts.
(c) Turn the left and right tie rod ends an amount to adjust the
toe±in.
Toe±in (total):
A+ B: 0° + 0.1°
C±D: 0 + 1 mm (0 + 0.04 in.)
HINT: Ensure that the lengths of the left and right tie rods are
the same.
Tie rod end length left±right error:
Less than 1.5 mm (0.059 in.)
(d) Tighten the tie rod end lock nut.
Torque: 56 NVm (570 kgfVcm, 41 ftVlbf)
(e) Place the boot on the seat and clip it.
HINT: Ensure that the boots are not twisted.
± SUSPENSION AND AXLEWHEEL ALIGNMENTSA±5