vacuum LEXUS SC400 1991 Service Manual Online

SERVICE DATA (Cont'd)
TORQUE SPECIFICATIONS
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Part tightened  NVm kgf Vcm ft Vlbf
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Camshaft bearing cap X Cylinder head  20 200 14
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No.1 cylinder head cover X Cylinder head5.45548 in. Vlbf\
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No.2 cylinder head cover X Cylinder head  5.4 55 48 in. Vlbf\
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Intake air connector X Air intake chamber  21 210 15\
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Throttle body bracket X Throttle body  21 210 15\
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Throttle body bracket X Cylinder head  21 210 15
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EGR pipe X Intake manifold  21 210 15
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EGR pipe X EGR valve  64 650 47
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Spark plug X Cylinder head  18 180 13
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Throttle body X Intake air connector  21 210 15
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Idler pulley X Oil pump  34 350 25
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Crankshaft pulley X Crankshaft3243,300239\
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Camshaft timing pulley X Camshaft  79 810 59\
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Timing belt tensioner X Oil pump  26 270 20\
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Drive belt tensioner X Cylinder head  21 210 15\
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EGR cooler X Cylinder head  14 140 10
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Engine coolant temperature sensor X Cylinder
head 


 


20 


200 


14
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Engine coolant temperature sender gauge X Cylin-
der head 


 


20 


200 


14
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Engine hanger X Cylinder head  39 400 29
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Cylinder head X Cylinder block1st3435025\
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 2nd Turn 90
5  
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 3rd Turn 905  
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No.4 Timing belt cover X Cylinder head  8.8 90 78 in.Vlbf\
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Intake manifold X Cylinder head  21 210 15
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Intake manifold stay X Intake manifold  39 400 29
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Intake manifold stay X Cylinder head  39 400 29
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No.1 fuel pipe X Intake manifold  8.8 90 78 in. Vlbf
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No.2 fuel pipe X Intake manifold  8.8 90 78 in. Vlbf
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Delivery pipe X Intake manifold  21 210 15
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Air intake chamber X Intake manifold  21 210 15
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Air intake chamber stay X Air intake chamber1818513\
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Air intake chamber stay X Cylinder head  18 185 13\
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Vacuum control valve set X Intake manifold  21 210 15\
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No.2 vacuum pipe X Air intake chamber  21 210 15\
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Water outlet X Cylinder head  21 210 15
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Water by±pass outlet X Cylinder head  8.8 90 78 in. Vlbf
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Exhaust manifold X Cylinder head  39 400 29
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Exhaust manifold heat insulator X Exhaust manifold  18 185 13
EM±116±
ENGINE MECHANICAL Service Specifications
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(e) Reinstall the fuel pressure regulator to the RH deliverypipe.
w Fully loosen the lock nut on the pressure regulator.
w Apply a light coat of gasoline to a new O±ring, and
install it to the pressure regulator.
w Completely insert the pressure regulator into the
delivery pipe by hand.
w Turn the pressure regulator counterclockwise until
the vacuum sensing port faces in the direction
indicated in the illustration.
INSTALLATION OF INJECTORS
(See Components on page FI±49)
1. INSTALL INJECTORS AND DELIVERY PIPE (a) Install the grommet to each injector.
(b) Apply a light coat of gasoline to a new O±ring and install
it to each injector.
(c) W h i l e t u r n i n g t h e i n j e c t o r c l o c k w i s e a n d counterclockwise, push it to the delivery pipes. Install
the eight injectors.
(d) Position the injector connector outward.
(e) Place the eight insulators and four spacers in position on the intake manifold.
FI±54
EFI SYSTEM
± Fuel System (Injectors)
WhereEverybodyKnowsYourName

Acoustic Control Induction System (ACIS)
ON±VEHICLE INSPECTION
INSPECT IACV(a) Using a 3±way connector, connect vacuum gauge to the
actuator hose.
(b) Start the engine.
(c) While the engine is idling, check that the vacuum gauge needle does not move.
(d) Repidly depress the accelerator pedal to fully open position and check that the vacuum gauge needle
momentarily fluctuates approx. 53.3 kPa (400 mmHg,
15.75 in.Hg). (The actuator rod is pulled out.)
FI±56
±
EFI SYSTEM Air Induction System (Acoustic Control Induction System (ACIS)
WhereEverybodyKnowsYourName

3. REMOVE VACUUM CONTROL VALVE SET(a) Disconnect the connector from the VSV.
(b) Disconnect the following hoses:(1) Vacuum hose from VSV
(2) Vacuum hose from vacuum pipe
(c) Remove the two nuts and vacuum control valve set.
4. REMOVE VACUUM TANK AND VSV Remove the screw, vacuum hose and VSV from the vacuum
tank.
5. REMOVE OIL DIPSTICK FOR ENGINE
6. DISCONNECT NO. 2 VACUUM PIPE Remove the two nuts and disconnect the vacuum pipe.
7. REMOVE EGR PIPE (a) Loosen the union nut.
(b) Remove the two bolts, EGR pipe and gasket.
8. REMOVE AIR INTAKE CHAMBER (a) Disconnect the following hoses:(1) Vacuum hose from brake booster union
(2) Air hose (from charcoal canister)
(3) Vacuum hose from vacuum pipe
(4) Vacuum sensing hose
(5) Air hose (from PS air control valve)
FI±58
±
EFI SYSTEM
Air Induction System (Acoustic Control Induction System (ACIS)
WhereEverybodyKnowsYourName

(b) Remove the six nuts and five bolts holding the intake airconnector to the air intake chamber.
(c) Disconnect the check connector and harness protector from the air intake chamber.
(d) Remove the five bolts, two nuts, intake air chamber and two gaskets.
INSPECTION OF ACOUSTIC CONTROL
INDUCTION SYSTEM (ACIS)
1. INSPECT IACV (a) With 53.3 kPa (400 mmHg, 15.75 in.Hg) of vacuumapplied to the actuator, check that the actuator rod
moves.
(b) One minute after applying the vacuum in (a), check that the actuator rod does not return.
If the operation is not as specified, turn the adjusting screw.
2. INSPECT VACUUM TANK (a) Check that air flows from port A to port B.
(b) Check that air does not flow port B to port A.
(c) Plug port B with your finger, and apply 53.3 kPa (400
mmHg, 15.75 in.Hg) of vacuum to port A, and check that
there is no changer in vacuum after one minute.
If the operation is not as specified, replace the vacuum tank.
±
EFI SYSTEMFI±59Air Induction System (Acoustic Control Induction System (ACIS)
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INSTALLATION OF ACOUSTIC CONTROL
INDUCTION SYSTEM
(See Components on page FI±57)
1. INSTALL AIR INTAKE CHAMBER (a) Place a new gasket so the protrusion faces the intake
chamber.
(b) Install a new gasket to the intake manifold, and the intake chamber with the five bolts and two nuts.
Torque: 21 N Vm (210 kgf Vcm, 15 ft Vlbf)
(c) Connect the check connector and harness protector
with the two bolts to the air intake chamber.
(d) Install the six nuts and five bolts holding the intake air connector to the air intake chamber.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
(e) Connect the following hoses:
(1) Vacuum hose to brake booster union
(2) Air hose (to charcoal canister)
(3) Vacuum hose from vacuum pipe
(4) Vacuum sensing hose
(5) Air hose (to PS air control valve)
2. INSTALL EGR PIPE (a) Install a gasket and the EGR pipe with the two bolts.
Torque: 21 N Vm (210 kgf Vcm, 15 ft Vlbf)
(b) Tighten the union nut.
Torque: 64 N Vm (650 kgf Vcm, 47 ft Vlbf)
±
EFI SYSTEMFI±61Air Induction System (Acoustic Control Induction System (ACIS)
WhereEverybodyKnowsYourName

3. INSTALL NO.2 VACUUM PIPEInstall the vacuum pipe with the two nuts.
Torque: 21 N Vm (210 kgf Vcm, 15 ft Vlbf)
4. INSTALL OIL DIPSTICK FOR ENGINE
5. INSTALL VACUUM TANK AND VSV
(a) Install the VSV with the screw on the vacuum tank.
Torque: 8.8 N Vm (90 kgf Vcm, 78 in. Vlbf)
(b) Install the vacuum hose.
6. INSTALL VACUUM CONTROL VALVE SET (a) Install the vacuum control valve set with the two nuts.
Torque: 21 N Vm (210 kgf Vcm, 15 ft Vlbf)
(b) Connect the following hoses:
(1) Vacuum hose to VSV
(2) Vacuum hose to vacuum pipe
(c) Connect the connector to the VSV.
7. (A/T) INSTALL DIPSTICK GUIDE FOR TRANSMISSION
(a) Install a new O±ring on the dipstick guide.
(b) Apply soapy on the O±ring.
(c) Connect the dipstick guide end to the tube of the oil pan,
and install the dipstick guide with the bolt.
(d) Install the dipstick.
8. CONNECT CABLE TO NEGATIVE TERMINAL OF BATTERY
FI±62
±
EFI SYSTEM
Air Induction System (Acoustic Control Induction System (ACIS)
WhereEverybodyKnowsYourName

ON±VEHICLE INSPECTION
1. INSPECT THROTTLE BODY(a) Remove the throttle body cover.w Remove the mounting cap nut.
w Loosen the two bolts, and remove the throttle body
cover.
(b) Check that the throttle linkage moves smoothly.
(c) Check the vacuum at each port. w Start the engine.
w Check the vacuum with your finger.
Port nameAt idlingAt 3,000 rpm
PNo vacuumVacuum
*ENo vacuumVacuum
*RNo vacuumVacuum
* Exc. USA Spec.
(d) Reinstall the throttle body cover.
3. INSPECT AND ADJUST DASH POT (DP)
A. Warm up engine Allow the engine to warm up to normal operating tempera-
ture.
B. Check idle speed
Idle speed: 700 + 50 rpm
C. Remove cap, filter and separator from DP FI±67
EFI SYSTEM
± Air Induction System (Throttle Body)
WhereEverybodyKnowsYourName

6. REMOVE UPPER HIGH±TENSION CORD COVER(a) Remove the two mounting bolts.
(b) Disconnect the front side claw groove of the cord coverfrom the claw of the lower cover, and remove the cord
cover.
7. 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) Disconnect the following hoses: (1) Heater water hose from heater water valve
(2) Water by±pass hose from ISC valve
(3) (USA Spec.) Vacuum hose from throttle body
(4) (Exc. USA Spec.) Three vacuum hoses from throttle body FI±71
EFI SYSTEM
± Air Induction System (Throttle Body)
WhereEverybodyKnowsYourName

INSTALLATION OF THROTTLE BODY
(See Components o page FI±69)
1. INSTALL THROTTLE BODY (a) Install the two water by±pass hoses and pipe to thethrottle body.
(b) Connect the following hoses: (1) PCV hose to throttle body
(2) Water by±pass hose to throttle body
(c) Install a new gasket and throttle body with the two bolts and two nuts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT: Use bolts 40 mm (1.57 in.) in length.
(d) Install the water by±pass pipe (from rear water by±pass
joint) to the clamp on the engine wire cover.
(e) Connect the following hoses: (1) Water by±pass hose to the ISC valve
(2) (USA Spec.) Vacuum hose to throttle body
(3) (Exc. USA Spec.) Three vacuum hoses to throttle body FI±77
EFI SYSTEM
± Air Induction System (Throttle Body)
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