ABS LEXUS SC400 1991 Service Repair Manual
[x] Cancel search | Manufacturer: LEXUS, Model Year: 1991, Model line: SC400, Model: LEXUS SC400 1991Pages: 4087, PDF Size: 75.75 MB
Page 3304 of 4087
LOWER SUSPENSION ARM REMOVAL
SA1A4±01
1. JACK UP VEHICLE AND REMOVE FRONT WHEEL
2. REMOVE ENGINE UNDER COVER
3. REMOVE FRONT BRAKE CALIPER
(b) Hang up the brake caliper using wire, etc.
4. DISCONNECT STABILIZER BAR LINK FROM LOWERSUSPENSION ARM
Remove the nut and disconnect the link from the arm.
5. DISCONNECT STEERING KNUCKLE
(a) Remove the clip and nut.
(b) Using SST, disconnect the steering knuckle from the lower suspension arm.
SST 09628±62011
6. REMOVE LOWER SUSPENSION ARM
(a) R e m o v e t h e b o l t a n d n u t a n d d i s c onnect the lower
suspension arm from the shock absorber.
±
SUSPENSION AND AXLE FRONT SUSPENSIONSA±41
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Page 3305 of 4087
(b) Before loosening the adjusting cam, place matchmarks onthe front and rear adjusting cams and body.
(c) Remove the nuts and adjusting cams and remove the lower suspension arm.
7. REMOVE SHOCK ABSORBER BRACKET FROM LOWER SUSPENSION ARM
Remove the 2 bolts and the bracket from the arm.
LOWER BALL JOINT INSPECTION
SA0RW±04
INSPECT BALL JOINT FOR ROTATION CONDITION
(a) As shown, flip the ball joint stud back and forth 5 times before
installing the nut.
(b) Using torque wrench, turn the nut continuously one turn every 2±4 seconds and take the torque reading on the 5th
turn.
Torque (turning):
1.0±3.4 N Vm (10±35 kgf Vcm, 9±30 in. Vlbf)
If not within specification, replace the lower suspension arm.
SA±42
±
SUSPENSION AND AXLE FRONT SUSPENSION
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Page 3306 of 4087
LOWER SUSPENSION ARM
INSTALLATION
SA1A5±01
1. INSTALL SHOCK ABSORBER BRACKET TO LOWERSUSPENSION ARM
Install the bracket to the arm with the 2 bolts.
Torque: 52 N Vm (530 kgf Vcm, 38 ft Vlbf)
2. INSTALL LOWER SUSPENSION ARM
(a) Install the lower suspension arm to the body and temporarily
install the adjusting cams and nut.
(b) Connect the lower suspension arm to the steering knuckle.
Torque: 125 N Vm (1,270 kgf Vcm, 92 ft Vlbf)
(c) Install a new clip.
(d) Connect the shock absorber to the lower suspension arm
with the bolt and nut.
Torque: 143 N Vm (1,460 kgf Vcm, 106 ft Vlbf)
2. CONNECT STABILIZER BAR LINK
(a) Connect the stabilizer bar link to the lower suspension arm
with the nut.
Torque: 74 N Vm (750 kgf Vcm, 54 ft Vlbf)
±
SUSPENSION AND AXLE FRONT SUSPENSIONSA±43
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Page 3316 of 4087
5. REMOVE DRIVE SHAFT LOCK NUT
(a) Install the brake disc and caliper.
(b) Remove the cotter pin and lock cap.
(c) While applying the brakes, remove the nut.
(d) Remove the brake caliper and disc.
6. REMOVE DRIVE SHAFT(See page SA±66)
7. REMOVE PARKING BRAKE SHOE
(See page BR±44)
8. REMOVE ABS SPEED SENSOR Remove the bolt and ABS speed sensor.
9. REMOVE REAR AXLE HUB WITH CARRIER
(a) Remove the 2 bolts.
(b) Remove the 2 bolts.
(c) Remove the hexagon bolt.
±
SUSPENSION AND AXLE REAR AXLE HUBSA±53
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Page 3321 of 4087
(c) Using SST and a press, install the axle hub.SST 09608±32010, 09608±35014 (09608±06020,09608±06100)
4. INSTALL OIL SEAL (INSIDE)
(a) Using SST and a hammer, install a new oil seal. SST 09223±15020, 09608±32010, 09608±35014,
(09608±06020)
(b) Coat MP grease to the oil seal lip.
5. INSTALL DUST DEFLECTOR Using SST and a press, install a new dust deflector.
SST 09608±32010, 09608±35014 (09608±06160)
HINT: Align the holes for the ABS speed sensor in the dust
deflector and carrier.
REAR AXLE CARRIER WITH UPPER
ARM INSTALLATION
SA0S1±03
1. INSTALL REAR AXLE HUB WITH CARRIER
(a) Connect the upper arm to the axle carrier with a new nut.
Torque: 109 N Vm (1,100 kgf Vcm, 80 ft Vlbf)
(b) Connect the No.2 lower suspension to the axle carrier with a
new nut.
Torque: 150 N Vm (1,525 kgf Vcm, 110 ft Vlbf)
SA±58±
SUSPENSION AND AXLE REAR AXLE HUB
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Page 3323 of 4087
(i) Install the 2 bolts.
Torque: 7.8 NVm (80 kgf Vcm, 69 in. Vlbf)
2. INSTALL PARKING BRAKE SHOE
(See page BR±44)
3. INSTALL ABS SPEED SENSOR Install the sensor to the axle carrier with the bolt.
Torque: 7.8 N Vm (80 kgf Vcm, 69 in. Vlbf)
4. INSTALL DRIVE SHAFT
(See page SA±67)
5. INSTALL BRAKE DISC AND BRAKE CALIPER
(a) Align the matchmarks and install the brake disc.
(b) Install the brake caliper with the 2 bolts.
Torque: 104 N Vm (1,065 kgf Vcm, 77 ft Vlbf)
6. INSTALL DRIVE SHAFT LOCK NUT
(a) Torque the nut while applying the brakes.
Torque: 289 N Vm (2,950 kgf Vcm, 213 ft Vlbf)
(b) Install the lock cap and a new cotter pin.
SA±60
±
SUSPENSION AND AXLE REAR AXLE HUB
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Page 3501 of 4087
![LEXUS SC400 1991 Service Repair Manual
Diag. Code 35
High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which
cause its](/img/36/57051/w960_57051-3500.png "LEXUS SC400 1991 Service Repair Manual
Diag. Code 35
High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which
cause its")
Diag. Code 35
High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which
cause its electrical resistance to change when stress is applied to the senso\
r's crystal (silicon) (piezo-
electric effect). This sensor is used to detect the atmospheric (absolute) press\
ure and outputs corre-
sponding electrical signals. Fluctuations in the air pressure cause changes in t\
he intake air density,
which can cause deviations in the air±fuel ratio. The signals from HAC sen\
sor are used to make correc-
tions for these fluctuations. If the ECU records diagnostic code º35º\
, the fail safe function operates and
the atmospheric pressure is set at a constant 101.3 kPa (760 mmHg, 29.92 i\
n.Hg).
Code No.Diagnostic Code Detecting ConditionTrouble Area
35Open or short in HAC sensor circuit for
0.5 sec. or more. ECU
DIAGNOSTIC CHART
Are there any other codes (besides Code 16)
being output?
Replace engine (& ECT) ECU.
Go to relevant diag. code chart.
TR±86±
ENGINE TROUBLESHOOTING Circuit Inspection
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Page 3506 of 4087
![LEXUS SC400 1991 Service Repair Manual
Diag. Code 35High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which cause i](/img/36/57051/w960_57051-3505.png "LEXUS SC400 1991 Service Repair Manual
Diag. Code 35High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which cause i")
Diag. Code 35High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which cause its
electrical resistance to change when stress is applied to the sensor's crystal (silicon) (piezoelectric effect). This
sensor is used to detect the atmospheric (absolute) pressure and outputs cor\
responding electrical signals. Fluc-
tuations in the air pressure cause changes in the intake air density, which can cause deviations in the air±fuel
ratio. The signals from HAC sensor are used to make corrections for these fluct\
uations. If the ECU records diag-
nostic code º35º, the fail safe function operates and the atmospheric pressure is set at a\
constant 760 mmHg.
Code No.Diagnostic Code Detecting ConditionTrouble Area
35Open or short detected in HAC sensor circuit for 0.5
sec. or more. ECU
DIAGNOSTIC CHARTDIAGNOSTIC CHART
Are there any other codes (besides Code 16)
being output?
Replace engine & ECT ECU. Go to relevant diag. code chart.
TR±92±
ENGINE TROUBLESHOOTING Circuit Inspection
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Page 3713 of 4087
![LEXUS SC400 1991 Service Repair Manual
Diag. Code 35
High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which
cause its](/img/36/57051/w960_57051-3712.png "LEXUS SC400 1991 Service Repair Manual
Diag. Code 35
High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which
cause its")
Diag. Code 35
High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which
cause its electrical resistance to change when stress is applied to the senso\
r's crystal (silicon) (piezo-
electric effect). This sensor is used to detect the atmospheric (absolute) press\
ure and outputs corre-
sponding electrical signals. Fluctuations in the air pressure cause changes in t\
he intake air density,
which can cause deviations in the air±fuel ratio. The signals from HAC sen\
sor are used to make correc-
tions for these fluctuations. If the ECU records diagnostic code º35º\
, the fail safe function operates and
the atmospheric pressure is set at a constant 101.3 kPa (760 mmHg, 29.92 i\
n.Hg).
Code No.Diagnostic Code Detecting ConditionTrouble Area
35Open or short in HAC sensor circuit for
0.5 sec. or more. ECU
DIAGNOSTIC CHART
Are there any other codes (besides Code 16)
being output?
Replace engine (& ECT) ECU.
Go to relevant diag. code chart.
TR±86±
ENGINE TROUBLESHOOTING Circuit Inspection
WhereEverybodyKnowsYourName
Page 3718 of 4087
![LEXUS SC400 1991 Service Repair Manual
Diag. Code 35High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which cause i](/img/36/57051/w960_57051-3717.png "LEXUS SC400 1991 Service Repair Manual
Diag. Code 35High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which cause i")
Diag. Code 35High Altitude Compensator Sensor
(HAC Sensor) Circuit
CIRCUIT DESCRIPTION
The HAC sensor is built into the ECU. This is a semiconductor pressure sens\
or with properties which cause its
electrical resistance to change when stress is applied to the sensor's crystal (silicon) (piezoelectric effect). This
sensor is used to detect the atmospheric (absolute) pressure and outputs cor\
responding electrical signals. Fluc-
tuations in the air pressure cause changes in the intake air density, which can cause deviations in the air±fuel
ratio. The signals from HAC sensor are used to make corrections for these fluct\
uations. If the ECU records diag-
nostic code º35º, the fail safe function operates and the atmospheric pressure is set at a\
constant 760 mmHg.
Code No.Diagnostic Code Detecting ConditionTrouble Area
35Open or short detected in HAC sensor circuit for 0.5
sec. or more. ECU
DIAGNOSTIC CHARTDIAGNOSTIC CHART
Are there any other codes (besides Code 16)
being output?
Replace engine & ECT ECU. Go to relevant diag. code chart.
TR±92±
ENGINE TROUBLESHOOTING Circuit Inspection
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