torque LEXUS SC400 1991 Service Repair Manual

(c) Connect the No. 1 lower suspension arm to the axle carrierwith a new nut.
Torque: 59 N Vm (600 kgf Vcm, 43 ft Vlbf)
(d) Connect the strut rod to the axle carrier and temporarily install
the bolt and nut.
(e) Connect the parking brake cable.
(f) Slide the backing plate to the inside.
(g) Install the hexagon bolt.
Torque: 180 N Vm (1,825 kgf Vcm, 132 ft Vlbf)
(h) Install the 2 bolts.
Torque: 26 N Vm (260 kgf Vcm, 19 ft Vlbf)
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SUSPENSION AND AXLE REAR AXLE HUBSA±59
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(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
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SUSPENSION AND AXLE REAR AXLE HUB
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7. STABILIZE SUSPENSION
(a) Install the rear wheel and lower the vehicle.
Torque: 103 NVm (1,050 kgf Vcm, 76 ft Vlbf)
(b) Bounce the vehicle up and down several times to stabilize the
suspension.
8. TORQUE BOLT AND NUTS
(a) Jack up the vehicle and remove the rear wheel.
(b) Support the axle carrier with jack.
(c) Torque the bolt and nuts.
Torque: 184 N Vm (1,880 kgf Vcm, 136 ft Vlbf)
9. INSTALL REAR WHEEL AND LOWER VEHICLE
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
10. CHECK REAR WHEEL ALIGNMENT
(See page SA±10)
HUB BOLT REPLACEMENT
SA03E±04
1. JACK UP VEHICLE AND REMOVE REAR WHEEL
2. REMOVE REAR BRAKE CALIPER AND BRAKE DISC
(See page SA±52)
3. REMOVE HUB BOLT Using SST, remove the hub bolt.
SST 09628±10011
4. INSTALL HUB BOLT Install washer and nut to the hub bolt, as shown in the illustra-
tion, and install the hub bolt with torquing the nut.
5. INSTALL REAR BRAKE DISC AND BRAKE CALIPER (See page SA±60)
6. INSTALL REAR WHEEL AND LOWER VEHICLE
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
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SUSPENSION AND AXLE REAR AXLE HUBSA±61
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PREPARATION
SST (SPECIAL SERVICE TOOLS)
SA06B±02
RECOMMENDED TOOLS
SA06C±02
EQUIPMENT
SA06D±01\
 
\

\
Torque wrench 


±
SUSPENSION AND AXLE REAR DRIVE SHAFTSA±63
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REAR DRIVE SHAFT INSTALLATION
SA0S4±02
1. INSTALL DRIVE SHAFT
(a) Insert the outboard joint side of the drive shaft to the axle hub.
NOTICE:
wBe careful not to damage the boots, end cover and speed
sensor rotor of the drive shaft, and oil seal of the axle hub.
w Make sure the outboard joint side of the drive shaft does
not bend too much.
(b) Align the matchmarks on the side gear shaft and drive shaft.
(c) Apply a light coat of engine oil on the threads of the bolt.
(d) Install the 6 hexagon bolts and 2 washers.
(e) Using a 10 mm hexagon wrench, torque the bolts.
Torque: 83 N Vm (850 kgf Vcm, 64 ft Vlbf)
2. INSTALL EXHAUST PIPE
3. INSTALL LOCK NUT, LOCK CAP AND NEW COTTER PIN
Torque: 289 N Vm (2,950 kgf Vcm, 213 ft Vlbf)
4. INSTALL REAR WHEEL AND LOWER VEHICLE
±
SUSPENSION AND AXLE REAR DRIVE SHAFTSA±67
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RECOMMENDED TOOLS
SA093±02
EQUIPMENT
SA094±01\
 
\

\
Dial indicator with magnetic base 


\
 
\

\
Micrometer
\
 
\

\
Torque wrench
±
SUSPENSION AND AXLE REAR DIFFERENTIALSA±77
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FAIL±SAFE CHART
If any of the following codes is recorded, the ECU enters fail±
safe mode.
Code No.Fail±Safe OperationFail±Safe Deactivation Conditions
14Fuel cut1 IGF1 detected in consecutive 8 ignitions.
15Fuel cut1 IGF2 detected in consecutive 8 ignitions.
16Torque control prohibited.Returned to normal condition.
22THW is fixed at 805C (176 5F).Returned to normal condition.
24THA is fixed at 20 5C (68 5F).Returned to normal condition.
31
Ignition timing controlled between 10 5 ~ 30 5
BTDC,
Injection time controlled between 3 msec. ~ 30 m
sec., in relation to:
w Engine rpm
w Throttle angle
w ISC step value
KS input 15 times/sec. or more.
35Atmospheric pressure is fixed at 760 mmHg.Returned to normal condition.
The following 1 or 2 must be repeated at least 2
times consecutively.
41VTA1 is fixed at 051 When IDL is ON41VTA1 is fixed at 051 When IDL is ON
0.25 V
VTA1
0.95 V
2 When IDL is OFF2 When IDL is OFF
0.25 V
VTA1
4.9 V
The following 1 or 2 must be repeated at least 2
times consecutively.
47Value of VTA1 is used1 When IDL2 is ON47Value of VTA1 is used.1 When IDL2 is ON
0.25 V
VTA2
0.95 V
2 When IDL2 is OFF2 When IDL2 is OFF
0.25 V
VTA2
4.9 V
52Max. timeing retardation.IG switch OFF.
53Max. timeing retardation.Returned to normal condition.
55Max. timeing retardation.IG switch OFF.
Back±Up Function
If there is trouble with the program in the ECU and the ignition signals\
(IGT) are not output, the ECU controls
fuel injection and ignition timing at predetermined levels as a back±up f\
unction to make it possible to continue
to operate the vehicle.
Furthermore, the injection duration is calculated from the satrting sign\
al (STA) and the throttle position signal
(IDL). Also, the ignition timing is fixed at the initial ignition timing, 5 5 BTDC, without relation to the engine speed.
HINT: If the engine is controlled by the back±up function, the CHECK ENGIN\
E light lights up to warn the driver
of the malfunction but the diagnostic code is not output. TR±22
±
ENGINE TROUBLESHOOTING Fail±Safe Chart
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FAIL±SAFE CHART
If any of the following codes is recorded, the ECU enters fail±safe mod\
e.
Code No.Fail±Safe OperationFail±Safe Deactivation Conditions
14Fuel cut1 IGF detected in consecutive 3 ignitions.
16Torque control prohibited.Returned to normal condition.
22THW is fixed at 805C (176 5F).Returned to normal condition.
24THA is fixed at 20 5C (68 5F).Returned to normal condition.
31 Ignition timing fixed at 10 5 BTDC.
 Injection time fixed
Starting 9 m sec.KS input 15 times/sec. or more.
IDL ON 3.6 m sec.
IDL OFF 6.7 m sec.
35Atmospheric pressure is fixed at 101.3 kPa
(760 mmHg 29 92 in Hg)
Returned to normal condition.
(760 mmHg, 29.92 in.Hg).
41VTA1 is fixed at 05.The following must each be repeated at least 241VTA1 is fixed at 0 5.The following must each be re eated at least 2
time consecutively.time consecutively.
(w/o TRAC)(w/o TRAC)
 0.1 V ? VTA ? 0.95 V 0.1 V ? VTA ? 0.95 V
 IDL : ON
( / TRAC)(w/ TRAC)
025V?VTA?095V  0.25 V ? VTA ? 0.95 V
 IDL:ON  IDL : ON
52Max. timing retardation.IG switch OFF.
53Max. timing retardation.Returned to normal condition.
55Max. timing retardation.IG switch OFF.
Back±Up Function
If there is trouble with the program in the ECU and the ignition signals\
(IGT) are not output, the ECU controls
fuel injection and ignition timing at predetermined levels as a back±up f\
unction to make it possible to continue
to operate the vehicle.
Furthermore, the injection duration is calculated from the starting sign\
al (STA) and the throttle position signal
(IDL). Also, the ignition timing is fixed at the initial ignition timing, 10 5 BTDC, without relation to the engine speed.
HINT: If the engine is controlled by the back±up function, the ºCHECKº\
engine warning light lights up to warn
the driver of the malfunction but the diagnostic code is not output. TR±26
±
ENGINE TROUBLESHOOTING Fail±Safe Chart
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Are there any other codes (besides
Code 16) being output?
Replace engine (& ECT) ECU.
Go to relevant diag. code
chart.
Diag. Code 16ECT Control Signal Malfunction
CIRCUIT DESCRIPTION
The signal from the ECT CPU retards the ignition timing of the engine durin\
g ECT gear shifting, thus momentarily
reducing torque output of the engine for smooth clutch operation inside the transmission and reduced shift
shock.
If the ECU records the diagnostic code º16º in memory, it prohibits the torque control of the ECT which performs
smooth gear shifting.
DTC No.DTC Detecting ConditionTrouble Area
16Fault in communications between the engine CPU and
ECT CPU in the ECU.
ECU
If the ECU records the diagnostic trouble code º16º in memory, it prohibits the torque control of the ECT which
performs smooth gear shifting.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
TR±58±
ENGINE TROUBLESHOOTING Circuit Inspection
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Diag. Code 16ECT Control Signal Malfunction
CIRCUIT DESCRIPTION
The signal from the ECT CPU retards the ignition timeing of the engine duri\
ng ECT gear shifting, thus mo-
mentarily reducing torque output of the engine for smooth clutch operati\
on inside the transmission and re-
duced shift shock.
Code No.Diagnostic Code Detecting ConditionTrouble Area
16Fault in communications between the engine
CPU and ECT CPU in the ECU.
ECU
If the ECU records the diagnostic code ª16º in memory, it prohibits the torque control of the ECT which per-
forms smooth gear shifting.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
Are there any other codes (besides Code 16)
being output?
Replace engine & ECT ECU. Go to relevant diag. code chart.
±
ENGINE TROUBLESHOOTING Circuit InspectionTR±61
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