ABS LEXUS SC400 1991 Service Repair Manual

FUEL EVAPORATIVE EMISSION CONTROL (EVAP) SYSTEM
DESCRIPTION
To reduce HC emission, evaporated fuel from the fuel tank is routed throug\
h the charcoal canister to the
intake manifold for combustion in the cylinders.
OPERATION
CoolantVSVThrottle ValveCanister Check ValveCheck
Valve inEvaporated F el (HC)Coolant
Te m p .VSVThrottle Valve
Opening(1)(2)(3)Valve inCapEvaporated Fuel (HC)
BelowNoFulley closedBelow
40 5C (104 5F)
No
OperationFulley closed.±±±±Small volume of HC from
Fully closed or
bellow Specified air
canister enters air intake
chamber.
Above
bellow Specified air
volume.±±±±chamber.
Above
40 5C (104 5F)Operation
Conditions other
than above.±±±±
HC from canister enters air
intake chamber in the amout
programmed in accordance
with the intake air volume.
High pres-
sure in tank±±±OPENCLOSEDCLOSEDHC from tank is absorbed
into the canister.
High vacuum
in tank±±±CLOSEDOPENOPENAir is led into the fuel tank.
INSPECTION OF FUEL VAPOR LINES,
FUEL TANK AND TANK CAP
1. VISUALLY INSPECT LINES AND CONNECTIONS
Look for loose connections, sharp bends or damage.
2. VISUALLY INSPECT FUEL TANK Look for deformation, cracks or fuel leakage.
EC±8
±
EMISSION CONTROL SYSTEMS Fuel Evaporative Emission Control (EVAP) System
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ELECTRONIC CONTROL SYSTEM
PRECAUTION
SR0GR±01
Do not open the cover or the case of the ECU and various computers unless \
absolutely necessary.
(If the IC terminals are touched, the IC may be destroyed by static ele\
ctricity.)
ELECTRONIC CIRCUIT
SR0GS±04
±
STEERING POWER STEERINGSR±163
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CENTER AIRBAG SENSOR ASSEMBLY
REMOVAL AND INSTALLATION
RS049±01
NOTICE:
wDo not open the cover or the case of the ECU and various
computers unless absolutely necessary. (If the IC
terminals are touched, the IC may be destroyed by static
electricity.)
w Never use SRS parts from another vehicle. When
replacing parts, replace with new parts.
w Never reuse the center airbag sensor assembly involved
in a collision when the airbag has deployed.
w Never repair a sensor in order to reuse it.
1. DISCONNECT NEGATIVE (±) TERMINAL CABLE FROM
BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the LOCK posi-
tion and the negative (±) terminal cable is disconnected
from the battery (See page RS±2).
2. REMOVE AND INSTALL CENTER AIRBAG SENSOR ASSEMBLY
(a) Using a torx wrench, loosen and tighten the 3 screws.
Torx wrench: T40 (Part No. 09042±00020 or locally manufac-
tured tool)
(b) Disconnect and connect the connector. NOTICE: Removal and installation of the connector is
done with the sensor assembly installed.
(c) Using a torx wrench, tighten the 3 screws. Torx wrench: T40 (Part No. 09042±00020 or locally manufac-
tured tool)
Torque: 15 N Vm (150 kgf Vcm, 11 ft Vlbf)
NOTICE:
w Make sure the sensor assembly is installed to the
specified torque.
w If the sensor assembly has been dropped, or there are
cracks, dents or other defects in the case, bracket or
connector, replace the sensor assembly with a new one.
w When installing the sensor assembly, take care that the
airbag wiring does not interfere with other parts and is
not pinched between other parts.
w After installation, shake the sensor assembly to check
that there is no looseness.
RS±46±
SUPPLEMENTAL RESTRAINT SYSTEM CENTER AIRBAG SENSOR ASSEMBLY
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DIAGNOSTIC TROUBLE CODE
CLEARANCE
Using diagnostic check wire:(a) Connect the 2 service wires to terminals Tc and AB of DLC1.
(b) Turn the ignition switch ACC or ON And wait approx. 6 seconds.
(c) Starting with the Tc terminal, apply body ground alternately to terminal Tc and terminal AB twice each in cycles of 1.0
seconds Confirm that body ground is absolute. Finally, keep
applying body ground to terminal Tc.
HINT: When alternately grounding terminals Tc and AB, re-
lease ground from one terminal and immediately apply it to
the other terminal within an interval of 0.2 second. If diagnos-
tic trouble codes do not clear, repeat the above procedure un-
til the codes are cleared.
(d) Several seconds after performing the clearing procedure, theSRS warning light will blink in a 50 m sec cycle to indicate the
codes have been cleared.
±
SUPPLEMENTAL RESTRAINT SYSTEM TROUBLESHOOTINGRS±63
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REAR SHOCK ABSORBER
COMPONENTS
SA0SB±05
±
SUSPENSION AND AXLE REAR SUSPENSIONSA±107
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REAR SHOCK ABSORBER REMOVAL
SA0SC±02
1. JACK UP VEHICLE AND REMOVE REAR WHEEL
2. REMOVE REAR BRAKE CALIPER
(a) Remove the 2 bolts and remove the brake caliper from therear axle carrier.
(b) Hang up the brake caliper using wire, etc.
3. REMOVE SHOCK ABSORBER WITH COIL SPRING
(a) Remove the nut and bolt on lower side of the shock absorber.
(b) Remove the absorber cap.
(c) Loosen the nut in the middle of the suspension support.
NOTICE: Only loosen the nut, do not remove it.
(d) Remove the 3 nuts and shock absorber with the coil spring.
SA±108
±
SUSPENSION AND AXLE REAR SUSPENSION
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4. REMOVE SUSPENSION SUPPORT AND COIL SPRING
(a) Install a bolt and 2 nuts to the bracket at the lower portion ofthe shock absorber shell and secure it in a vise.
(b) Using SST, compress the coil spring. SST 09727±30020
NOTICE: Do not use an impact wrench.
It will damage the SST.
(c) Remove the suspension support nut.
(d) Remove the suspension support, coil spring and insulator.
(e) R e m o v e t h e i n s u l a t o r a n d s p r i n g b u m p e r f r o m t h e suspension support.
±
SUSPENSION AND AXLE REAR SUSPENSIONSA±109
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REAR SHOCK ABSORBER INSPECTION
SA0SD±03
INSPECT SHOCK ABSORBER
Compress and extend the shock absorber rod and check that
there is no abnormal resistance or unusual operation
sounds.
If there is any abnormality, replace the shock absorber with
a new one.
NOTICE: When discarding the shock absorber, use the
following procedure.
REAR SHOCK ABSORBER DISPOSAL
SA0SE±03
1. FULLY EXTEND SHOCK ABSORBER ROD
2. DRILL HOLE TO REMOVE GAS FROM CYLINDERUsing a drill, make a hole in the cylinder, as shown to remove
the gas inside.
CAUTION: The gas coming out is harmless, but be care-
ful of chips which may fly up when drilling.
REAR SHOCK ABSORBER
INSTALLATION
SA0WB±02
1. INSTALL SUSPENSION SUPPORT AND COIL SPRING
(a) Install the spring bumper to the suspension support.
(b) Install the insulator to the suspension support. HINT: Match the bolt of the suspension support with the cut±
off part of the insulator.
(c) Using SST, compress the coil spring. SST 09727±30020
NOTICE: Do not use an impact wrench.
It will damage the SST.
SA±110
±
SUSPENSION AND AXLE REAR SUSPENSION
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(d) Install the coil spring to the shock absorber.HINT: Fit the lower end of the coil spring into the gap of the
spring seat of the shock absorber.
(e) Install the suspension support to the rod and temporarily tighten a new nut.
(f) Rotate the suspension support so that the rod and one of the bolts on suspension support are aligned with the lower
bushing.
(g) Remove the SST. HINT: After removing the SST, again check the direction of
the suspension support.
2. INSTALL SHOCK ABSORBER WITH COIL SPRING TO VEHICLE
(a) Install the shock absorber with the coil spring to the vehicle
with the 3 nuts.
Torque: 25 N Vm (260 kgf Vcm, 19 ft Vlbf)
(b) Torque the temporarily tightened nut in the middle of the
suspension support.
Torque: 27 N Vm (280 kgf Vcm, 20 ft Vlbf)
±
SUSPENSION AND AXLE REAR SUSPENSIONSA±111
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3. INSTALL SHOCK ABSORBER TO REAR AXLE CARRIER
(a) Install the bolt from the rear vehicle.
(b) Temporarily install the nut.
4. INSTALL REAR BRAKE CALIPERInstall the brake caliper to the rear axle carrier with the 2 bolts.
Torque: 104 N Vm (1,065 kgf Vcm, 77 ft Vlbf)
5. STABILIZE SUSPENSION
(a) Install the rear wheel and lower vehicle
(b) Bounce the vehicle up and down several times to stabilize the
suspension.
(c) Jack up the vehicle and remove the rear wheel.
6. TIGHTEN BOLT AND NUT
(a) Support the lower arm with a jack.
(b) Tighten the bolt and nut.
Torque: 143 N Vm (1,460 kgf Vcm, 106 ft Vlbf)
7. INSTALL REAR WHEEL AND LOWER VEHICLE
Torqre: 137 N Vm (1,050 kgf Vcm, 101 ft Vlbf)
8. CHECK REAR WHEEL ALIGNMENT
(See page SA±10)
SA±112
±
SUSPENSION AND AXLE REAR SUSPENSION
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