LEXUS SC400 1991 Service Repair Manual

(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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3. INSPECT VSV
A. Inspect VSV for open circuitUsing an ohmmeter, check that there is continuity, between
the terminals.
Resistance (Cold): 38.5±44.5
at 20 5C (68 5F)
If there is no continuity, replace the VSV.
B. Inspect VSV for ground Using an ohmmeter, check that there is no continuity be-
tween each terminal and the body.
If there is continuity, replace the VSV.
C. Inspect VSV operation (a) Check that air flows from port E to the filter.
(b) Apply battery voltage across the terminals.
(c) Check that air flows from port E to port F.
If operation is not as specified, replace the VSV.
FI±60
±
EFI SYSTEM
Air 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)
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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)
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Fuel Pressure Pulsation Damper
COMPONENTS FOR REMOVAL AND
INSTALLATION
FI±58 ± Fuel System (Fuel Pressure Pulsation Damper)EFI SYSTEM
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REMOVAL OF FUEL PRESSURE
PULSATION DAMPER
(See Component on page FI±58)
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OF BATTERY
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ºLOCKº position and the negative (±) termi-
nal cable is disconnected from the battery.
2. 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.
3. REMOVE LH ENGINE WIRE COVER Remove the two bolts and engine wire cover.
4. REMOVE FUEL PRESSURE PULSATION DAMPER (a) Remove the pulsation damper and upper gasket.
(b) Disconnect the fuel inlet hose from the delivery pipe,and remove the lower gasket. FI±59
EFI SYSTEM
± Fuel System (Fuel Pressure Pulsation Damper)
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INSTALLATION OF FUEL PRESSURE
PULSATION DAMPER
(See Components on page FI±58)
1. INSTALL FUEL PRESSURE PULSATION DAMPER Using SST, install two new gaskets, the inlet hose and pulsa-
tion damper.
SST 09612±24014 (09617±24011)
Torque: 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
33 N Vm (340 kgf Vcm, 24 ft Vlbf) for SST
HINT: Use a torque wrench with a fulcrum length of 30 cm
(11.81 in.)
2. INSTALL LH ENGINE WIRE COVER
(a) Connect portions A and B engine wire cover to the wirebrackets.
(b) Set the VSV (for fuel pressure control system) wire in original position.
(c) Fit portions C and D of the engine wire cover, matching them with the lower high±tension cord cover and No.3
timing belt cover.
(d) Install the engine wire cover with the two bolts.
3. INSTALL UPPER HIGH±TENSION CORD COVER (a) Fit portion A of the upper high±tension cover, matching
it with the top of the lower high±tension cord cover.
(b) Push the front side of the high±tension cord cover, and connect the front side claw groove of the upper
high±tension cord cover to the claw of the lower
high±tension cord cover.
(c) Install the upper high±tension cord cover with the two bolts.
4. CONNECT CABLE TO NEGATIVE TERMINAL OF BATTERY
5. CHECK FOR FUEL LEAKS (See page FI±16)
FI±60
EFI SYSTEM
± Fuel System (Fuel Pressure Pulsation Damper)
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Fuel Tank and Lines
COMPONENTS
FI±61 ± Fuel System (Fuel Tank and Lines)EFI SYSTEM
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PRECAUTIONS
1. Always use new gaskets when replacing the fuel tank orcomponent part.
2. Apply the proper torque to all parts tightened.
INSPECTION OF FUEL LINES AND
CONNECTIONS
(a) Inspect the fuel lines and connections for cracks,
leakage or deformation.
(b) Inspect the fuel tank vapor vent system hoses and connections for looseness, kinks or damage.
(c) Inspect the fuel tank for deformation, cra cks, fuel
leakage or tank band looseness.
(d) Check the filter neck for damage or fuel leakage.
(e) Ho se an d tu b e c onnections are as shown in the
illustration.
If a problem is found, repair or replace the parts as necessary.
FI±62
EFI SYSTEM
± Fuel System (Fuel Tank and Lines)
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AIR INDUCTION SYSTEM
Air Flow Meter
ON±VEHICLE INSPECTION
INSPECT RESISTANCE OF AIR FLOW METER(a) Disconnect the air flow meter connector.
(b) Using an ohmmeter, measure the resistance betweenterminals THA and E2.
BetweenResistanceTe mperatureBetween
terminalsResistanceTem erature
terminals
10±20 k
±20°C (±4 °F)
4±7 k
9°C (32 °F)
THA±E22±3 k
20°C (68 °F)
0.9±1.3 k
40°C (104 °F)
0.4±0.7 k
60°C (140 °F)
If the resistance is not as specified, replace the air flow meter.
(c) Reconnect the air flow meter connector. FI±63
± Air Induction System (Air Flow M\
eter)EFI SYSTEM
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