ect LEXUS SC300 1991 Service Repair Manual

(g) Temporarily install the three bolts holding the deliverypipe to the cylinder head.
(h) Check that the injectors rotate smoothly.
HINT: If injectors do not rotate smoothly, the probable cause
is incorrect installation of O±rings. Replace the O±rings.
(i) Position the injector connector upward.
(j) Tighten the three bolts holding the delivery pipes to the intake manifold.
Torque: 21 N Vm (210 kgf Vcm, 15 ft Vlbf)
2. INSTALL CONTROL VALVE ACTUATOR
(a) Install the actuator with the two bolts.
Torque: 6.8 N Vm (70 kgf Vcm, 61 in. Vlbf)
(b) Inspect the IACV. (See page FI±59)
3. CONNECT INJECTOR CONNECTORS HINT: The No. 1, No. 3 and No. 5 injector connectors are gray,
and the No. 2, No. 4 and No. 6 injector connectors are dark
gray.
4. CONNECT VACUUM SENSING HOSE
±
EFI SYSTEM Fuel System (Injectors)FI±33
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5. INSTALL AIR INTAKE CHAMBER STAYSInstall the intake chamber stay with the bolt and nut.
Install the No. 1 and No. 2 stays.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT: The No. 1 stay is marked ºFº and No. 2 stay is marked
with ºRº.
6. CONNECT NO. 2 FUEL PIPE TO FUEL PRESSURE REGULATOR
Connect the fuel pipe with two new gaskets and the union
bolt.
Torque: 27 N Vm (280 kgf Vcm, 20 ft Vlbf)
7. CONNECT NO. 1 FUEL PIPE TO DELIVERY PIPE
Connect the fuel pipe with two new gaskets and the union
bolt.
Torque: 42 N Vm (420 kgf Vcm, 30 ft Vlbf)
8. INSTALL THROTTLE BODY WITH INTAKE AIR
CONNECTOR
(See steps 16 to 20 on pages EM±18 and 19)
9. FILL WITH COOLANT (See page CO±5)
10. C O N N E C T C A B L E TO N E G AT I V E T E R M I N A L O F BATTERY
FI±34
±
EFI SYSTEM Fuel System (Injectors)
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Fuel Pressure Pulsation Damper
COMPONENTS FOR REMOVAL AND
INSTALLATION
REMOVAL OF FUEL PRESSURE
PULSATION DAMPER
1. (A/T)REMOVE DIPSTICK GUIDE FOR TRANSMISSION
(a) Remove the mounting bolt.
(b) P u l l o u t t h e d i s t i c k g u i d e a n d d i p s t i c k f r o m t h etransmission.
(c) Remove the O±ring from the dipstick guide.
2. REMOVE STARTER (See page ST±5)
3. REMOVE FUEL PRESSURE PULSATION DAMPER (a) Remove the pulsation damper and upper gasket.
(b) Disc onnect the No. 1 fuel pipe from the fuel pipe
support, and remove the lower gasket.
±
EFI SYSTEM Fuel System (Fuel Pressure Pulsation Damper)FI±35
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INSTALLATION OF FUEL PRESSURE
PULSATION DAMPER
(See Components on page FI±35)
1. INSTALL FUEL PRESSURE PULSATION DAMPER (a) In sta ll two ne w ga ske ts, th e No . 1 fu e l pip e an dpulsation damper.
(b) Using SST, torque the pulsation damper.
SST 09612±24014 (09617±24011)
Torque: 41 N Vm (420 kgf Vcm, 30 ft Vlbf)
35 N Vm (350 kgf Vcm, 25 ft Vlbf) for SST
HINT: Use a torque wrench with a fulcrum length of 30 cm
(11.81 in.).
2. INSTALL STARTER (See page ST±5)
Torque: 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
3. (A/T)
INSTALL DIPSTICK GUIDE FOR TRANSMISSION
(a) Install a new O±ring to the dipstick guide.
(b) Apply soapy water to 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.
4. CHECK FOR FUEL LEAKS (See page FI±15)
FI±36
±
EFI SYSTEM Fuel System (Fuel Pressure Pulsation Damper)
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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±38
±
EFI SYSTEM REPAIR INSTRUCTIONS
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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.
Between
terminalsResistanceTemperature
10±20 k
±205C (±4 5F)
4±7 k
95C (32 5F)
THA±E22±3 k
205C (68 5F)THA E2
0.9±1.3 k
405C (104 5F)
0.4±0.7 k
605C (140 5F)
If the resistance is not as specified, replace the air flow meter.
(c) Reconnect the air flow meter connector.
±
EFI SYSTEM Air Induction System (Air Flow Meter)FI±39
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COMPONENTS
REMOVAL OF AIR FLOW METER
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OFBATTERY
CAUTION: Turn the ignition switch to ºLOCKº. Discon-
nect the cable from the negative (±) terminal of the bat-
tery. Wait at least 20 seconds before proceeding with
work.
2. REMOVE AIR CLEANER HOSE (a) Disconnect the following hoses:(1) PS air hose from No. 4 timing belt cover
(2) PCV hose from No. 2 cylinder head cover
(b) Loosen the two hose clamps and remove the air cleaner
hose.
FI±40
±
EFI SYSTEM Air Induction System (Air Flow Meter)
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3. REMOVE AIR FLOW METER FROM AIR CLEANER CASE(a) Disconnect the air flow meter connector.
(b) Remove the four nuts, bolt, air flow meter and gasket.
INSPECTION OF AIR FLOW METER
INSPECT AIR FLOW METERCheck that the honey±combed is neither deformed nor dam-
aged.
If necessary, replace the air flow meter.
INSTALLATION OF AIR FLOW METER
(See Components on page FI±40)
1. INSTALL AIR FLOW METER FROM AIR CLEANER CASE
(a) Install a new gasket and the air flow meter with the fournuts and a bolt.
Torque: 10 N Vm (100 kgf Vcm, 7 ft Vlbf)
(b) Connect the air flow meter connector.
2. INSTALL AIR CLEANER HOSE (a) Install the air cleaner hose with two hose clamps.
(b) Connect the following hoses:(1) PS air hose to No. 4 timing belt cover
(2) PCV hose to No. 2 cylinder head cover
3. CONNECT CABLE FROM NEGATIVE TERMINAL OF BATTERY
±
EFI SYSTEM Air Induction System (Air Flow Meter)FI±41
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Fuel Pressure Regulator
ON±VEHICLE INSPECTION
INSPECT FUEL PRESSURE (See page FI±18)
FI±42
± Fuel System (Fuel Pressure Regulator)EFI SYSTEM
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COMPONENTS FOR REMOVAL AND
INSTALLATION
REMOVAL OF FUEL PRESSURE
REGULATOR
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OFBATTERY
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 INTAKE AIR CONNECTOR (a) Disconnect the following hoses:(1) Air hose from ISC valve
(2) Air hose (from PS air control valve) from intake air
connector FI±43
EFI SYSTEM
± Fuel System (Fuel Pressure Regulator)
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