1991 LEXUS SC400 brake

 
Front water bypass joint x Cylinder head  18 185 13
 Intake manifold x Cylinder head1818513
Delivery pipe x Intake manifold1818513 
Fuel return pipe x Fuel pressure regulator
  
35
 
360
 
26 Fuel inlet hose x Delivery pipe  39 400 29  for SST 33 340 24 Cold start injector x Air intake chamber  7.8 80 69 in.Vlbf Air intake chamber x Intake manifold  18 185 13 EGR pipe x Air intake chamber  18 185 13
 EGR pipe x RH cylinder head  18 185 13
 Cold start injector tube x Air intake chamber  15 150 11
 Union (for brake booster) x Air intake chamber  29 300 22
 Throttle body x Air intake chamber  18 185 13
 IAC valve x Air intake chamber  18 185 13
 EGR valve adaptor x Air intake chamber  18 185 13
 EGR valve x EGR valve adaptor  18 185 13
Timing belt rear plate x Cylinder head7.88069 in. Vlbf 
Water outlet housing x Water pump
  
18
 
185
 
13 Main bearing stud bolt x Cylinder block  15 150 11 Main bearing cap x Cylinder block for nut (1st) 27 275 20  (2nd) Turn 90 5  
  for bolt 49 500 36 Connecting rod cap x Connecting rod 1st 25 250 18
  2nd Turn 905  
 Rear oil seal retainer x Cylinder block  7.8 80 69 in.Vlbf
 Water seal plate x Cylinder block  14 145 10
 Generator bracket x Cylinder block  18 185 13
 Oil pump x Cylinder block 12 mm head 16 160 12
  14 mm head 30 310 22
 No.1 oil pan x Cylinder block 10 mm head 7.8 80 69 in. Vlbf
12 mm head1818513 
No.1 oil pan x Oil pump
  
7.8
 
80
 
69 in. Vlbf No.1 oil pan x Rear oil seal retainer  7.8 80 69 in. Vlbf Oil strainer x Cylinder block  7.8 80 69 in. Vlbf Oil strainer x Oil pump  7.8 80 69 in. Vlbf Oil pan baffle plate x No.1 oil pan  7.8 80 69 in. Vlbf No.1 oil pan x No.2 oil pan  7.8 80 69 in. Vlbf
 Water pump x Cylinder block  18 185 13
 Water bypass pipe x Cylinder Block  18 185 13
 Knock sensor x Cylinder block  44 450 33
 Starter x Cylinder block  39 400 29
 Engine mounting bracket x Cylinder block  37 380 27
 Drive plate x Crankshaft  98 1,000 72
 Transmission x Cylinder block  57 580 42
 Transmission x No.1 oil pan  39 400 29
Drive plate x Torque converter3334025 Transmission oil cooler pipe x Transmission for union nut 34 350 25 Rear engine mounting member x Body  25 250 19\
 \
Rear engine mounting member x Rear engine mounting insulator1313510
EG±210±
1UZ ± FE ENGINE ENGINE MECHANICAL
WhereEverybodyKnowsYourName

Troubleshooting
If the CO/HC concentration does not comply with regulations,
perform troubleshooting in the order given below.
(a) Check main heated oxygen sensor operation.
(See MFI System on page EG±400)
(b) See the table below for possible causes, and then inspect and correct the applicable causes if necessary.
 CO HC Problems\
 \
Causes
 Normal High Rough idle\
 \
1. Faulty ignitions: 


 


 


\
 

\

Incorrect timing
   \
 \
Fouled, shorted or improperly gapped plugs
   \
 \
Open or crossed high±tension cords
   \
 \
Cracked distributor cap
   \
 \
2. Incorrect valve clearance   \
 \
3. Leaky EGR valve 


 


 


\
 

\
4. Leaky intake and exhaust valves
   \
 \
5. Leaky cylinder
 Low High Rough idle\
 \
1. Vacuum leaks:
   (Fluctuating HC reading)\
 \

PCV hose
   \
 \
EGR valve 


 


 


\
 

\

Intake manifold
   \
 \
Throttle body
   \
 \
IAC valve
   \
 \
Brake booster line
   \
 \
2. Lean mixture causing misfire 

High 

High 

Rough idle\
 

\
1. Restricted air filter
   (Black smoke from exhaust)\
 \
2. Faulty MFI systems:
   \
 \

Faulty pressure regulator
   \
 \
Clogged fuel return line
   \
 \
Defective ECT switch   \
 \
Faulty ECM 


 


 


\
 

\

Faulty injector
   \
 \
Faulty throttle position sensor
   \
 \
Faulty volume air flow meter
V02130
EG±36±
1UZ±FE ENGINE ENGINE MECHANICAL
WhereEverybodyKnowsYourName

16. REMOVE HEATER WATER VALVE FROM BODY
(a) Disconnect the VSV connector.
(b) Disconnect the bolt holding the engine wire clamp to thewater valve bracket.
(c) Remove the 2 bolts, and disconnect the water valve and bracket assembly.
17. REMOVE THROTTLE BODY
(a) Disconnect the following connectors: (1) Throttle position sensor connector
(2) w/ TRAC:
Sub±throttle position sensor connector
(3) w/ TRAC: Sub±throttle actuator connector
(b) Remove the 2 bolts and 2 nuts, and disconnect the throttle body from the air intake chamber.
(c) Disconnect the following hoses, and remove the throttle body:
(1) PCV hose from throttle body
(2) Water bypass hose from throttle body
(d) Remove the throttle body gasket.
18. REMOVE AIR INTAKE CHAMBER
(a) Disconnect the following hoses: (1) Brake booster vacuum hose from union on air intake
chamber
(2) Vacuum hose (from VSV for heater water valve) from air
intake chamber
EG±80
±
1UZ±FE ENGINE ENGINE MECHANICAL
WhereEverybodyKnowsYourName

(l) Install the accelerator bracket with the bolt and stud bolt.
(m) Install 2 new gaskets and union with the union bolt.
Torque: 29 NVm (300 kgf Vcm, 22 ft Vlbf)
(n) Connect the following hoses:
(1) Brake booster vacuum hose to union on air intake cham-
ber
(2) Vacuum hose (from VSV for heater water valve to air in-
take chamber
29. INSTALL THROTTLE BODY
(a) Disconnect the following hoses: (1) PCV hose to throttle body
(2) Water bypass hose to throttle body
(b) Install a new gasket and throttle body with the 2 bolts and 2 nuts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT: Use bolt 40 mm (1.57 in.) in length.
(c) Install the water bypass pipe (from the rear bypass joint) to the clamp on the engine wire cover.
(d) Connect the following connectors: (1) Throttle position sensor connector
(2) w/ TRAC: Sub±throttle position sensor connector
(3) w/ TRAC: Sub±throttle actuator connector
±
1UZ±FE ENGINE ENGINE MECHANICALEG±129
WhereEverybodyKnowsYourName

22. DISCONNECT POWER STEERING (PS) RESERVOIRTANK AND BRACKET FROM BODY
Remove the 3 bolts, and disconnect the reservoir tank and
bracket assembly.
23. DISCONNECT POWER STEERING (PS) PUMP FROM ENGINE
Remove the nut and 3 bolts, and disconnect the PS pump
from the engine.
HINT: Put aside the PS pump, and suspend it.
24. DISCONNECT AIR CONDITIONING (A/C) COMPRESSOR FROM ENGINE
(a) Disconnect the A/C compressor connector.
(b) Remove the nut, and disconnect the ground cable from the
A/C compressor stay.
(c) Remove the bolt and A/C compressor stay.
(d) Remove the 2 bolts, and disconnect the A/C compressor from the engine.
HINT: Put aside the A/C compressor, and suspend it.
25. DISCONNECT HOSES Disconnect the following hoses and ground strap:
(1) Heater water hose from water bypass hose
(2) Heater water hose from heater water valve
(3) Brake booster hose from union on air intake chamber
(4) Vacuum hose (from VSV for heater water valve) from air
intake chamber
(5) Ground strap from bracket on body.
EG±144
±
1UZ±FE ENGINE ENGINE MECHANICAL
WhereEverybodyKnowsYourName

12. INSTALL CHARCOAL CANISTER
(a) Install the charcoal canister.
(b) Connect the vacuum hose and air hose to the charcoalcanister.
13. CONNECT HOSES Connect the following hoses and ground strap:
(1) Heater water hose to water bypass hose
(2) Heater water hose to heater water valve
(3) Brake booster hose to union on air intake chamber
(4) Vacuum hose (from VSV for heater water valve) to air in-
take chamber
(5) Ground strap to bracket on body
(6) Fuel inlet hose to fuel tube
SST 09278±54012
Torque: 30 N Vm (310 kgf Vcm, 22 ft Vlbf)
HINT: Use a torque wrench with a fulcrum length of 30 cm
(11.81 in.).
(7) Fuel return hose to return pipe
14. INSTALL AIR CONDITIONING (A/C) COMPRESSOR
(a) Install the A/C compressor, compressor stay and ground cable with the nut and 3 bolts.
Torque:
49 NVm (500 kgf Vcm, 36 ft Vlbf) for bolt
29 N Vm (300 kgf Vcm, 22 ft Vlbf) for nut
(b) Connect the A/C compressor connector.
±
1UZ±FE ENGINE ENGINE MECHANICALEG±197
WhereEverybodyKnowsYourName

22. DISCONNECT PS RESERVOIR TANK AND BRACKET
FROM BODY
Remove the three bolts, and disconnect the reservoir tank
and bracket assembly.
23. DISCONNECT PS PUMP FROM ENGINE Remove the three pump bolts and nut, and disconnect the PS
pump.
HINT: Put aside the PS pump, and suspend it.
24. DISCONNECT A/C COMPRESSOR (a) Disconnect the compressor connector.
(b) Remove the mounting nut, and disconnect the groundcable.
(c) Remove the mounting bolt and compressor stay.
(d) Remove the two mounting bolts, and disconnect the compressor from the engine.
HINT: Put aside the compressor, and suspend it.
25. DISCONNECT HOSES AND GROUND STRAP Disconnect the following hose and ground strap:(1) Heater water hose from water by±pass pipe
(2) Heater water hose from heater water valve
(3) Vacuum hose from brake booster union on air in-
take chamber
(4) Vacuum hose (from VSV for heater water valve)
from air intake chamber
(5) Ground strap from bracket on body
±
ENGINE MECHANICAL Cylinder BlockEM±123
WhereEverybodyKnowsYourName

(g) Install the scuff plate.
(h) Connect the connectors.
(i) Install the lower instrument panel finish panel and glovecompartment door assembly with the four screws.
(j) Install the instrument panel under cover with the two clips.
12. INSTALL CHARCOAL CANISTER (a) Install the charcoal canister.
(b) Connect the vacuum hose and air hose to the charcoalcanister.
13. CONNECT HOSES Connect the following hose and ground strap:(1) Heater water hose to water by±pass pipe
(2) Heater water hose to heater water valve
(3) Vacuum hose to brake booster union on air intake
chamber
(4) Vacuum hose (from VSV for heater water valve) to
air intake chamber
(5) Ground strap to bracket on body
±
ENGINE MECHANICAL Cylinder BlockEM±171
WhereEverybodyKnowsYourName