torque LEXUS SC400 1991 Service Repair Manual

INSPECTION OF INJECTORS
1. INSPECT INJECTOR INJECTIONCAUTION: Keep injector clear of sparks during the test.
(a) Remove the two bolts and fuel hose clamp.
(b) Disconnect the fuel inlet hose from the fuel tube.
(c) Connect SST (hose) to the fuel inlet tube with SST(union). Tighten the flare nut on the fuel tube.
SST 09268±41045 (90405±52010)
Torque: 30 N Vm (310 kgf Vcm, 22 ft Vlbf)
HINT: Use SST. (See page FI±14)
SST 09631±22020
(d) Install a new O±ring to the fuel inlet of the pressure regulator.
(e) Connect SST (hose) to the fuel inlet of the pressure regulator with SST (union) and the two bolts.
SST 09268±41045 (09268±41090)
(f) Connect the fuel return hose to the fuel outlet of the pressure regulator with SST (union), two new gaskets
and union bolt.
SST 09268±41045 (90405±09015)
FI±30
±
EFI SYSTEM Fuel System (Injectors)
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(g) Install the grommet and a new O±ring to the injector.
(h) Connect SST (hose) to the injector with SST (union),and hold the injector and union with SST (clamp).
SST 09268±41045
(i) Put the injector into the graduated cylinder.
HINT: Install a suitable vinyl hose onto the injector to prevent
gasoline from splashing out.
(j) Using SST, connect terminals +B and FP of the check (ºDIAGNOSISº) connector.
SST 09843±18020
(k) Reconnect the cable to negative (±) terminal of battery.
(l) Turn the ignition switch ON.
NOTICE: Do not start the engine.
(m) Connect SST (wire) to the injector and battery for 15 seconds, and measure the injection volume with a
graduated cylinder. Test each injector two or three
times.
SST 09842±30070
Volume: 70±88 cm3 (4.3±5.4 cu in.) per 15 sec.
Difference between each injector:
9 cm
3 (0.5 cu in.) or less
If the injection volume is not as specified, replace the injector.
2. INSPECT LEAKAGE (a) In the condition above, disconnect the test probes ofSST (wire) from the battery and check the fuel leakage
from the injector.
SST 09842±30070
Fuel drop: One drop or less per minute
(b) Disconnect the battery negative (±) cable.
(c) Remove SST.
SST 09268±41045 and 09843±18020
(d) Reconnect the fuel inlet hose to the fuel tube.
SST 09631±22020
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.).
±
EFI SYSTEM Fuel System (Injectors)FI±31
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(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
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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
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EFI SYSTEM Fuel System (Injectors)
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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
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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
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EFI SYSTEM REPAIR INSTRUCTIONS
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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
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EFI SYSTEM Air Induction System (Air Flow Meter)FI±41
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(e) Connect the fuel return pipe to the pressure regulatorwith new two gaskets and the union bolt.
Torque: 35 N Vm (360 kgf Vcm, 26 ft Vlbf)
(f) Tighten the lock nut.
Torque: 29 N Vm (300 kgf Vcm, 22 ft Vlb)
2. CONNECT VACUUM SENSING HOSE TO FUEL
PRESSURE REGULATOR
3. INSTALL RH ENGINE WIRE COVER (a) Fit portions A and B of the engine wire cover, matchingthem with the lower high±tension cord cover and No.3
timing belt cover.
(d) Install the engine wire cover with the bolt.
FI±46
EFI SYSTEM
± Fuel System (Fuel Pressure Regulator)
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ENGINE SPEED SENSOR
COMPONENTS FOR REMOVAL AND
INSTALLATION
REMOVAL OF ENGINE SPEED SENSOR
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 ENGINE UNDER COVER
3. DISCONNECT ENGINE SPEED SENSOR CONNECTOR
4. REMOVE ENGINE SPEED SENSOR Remove the bolt and engine speed sensor.
INSTALLATION OF ENGINE SPEED
SENSOR
1. INSTALL ENGINE SPEED SENSOR
Torque: 6.4 N Vm (65 kgf Vcm, 56 in. Vlbf)
2. CONNECT ENGINE SPEED SENSOR CONNECTOR
3. INSTALL ENGINE UNDER COVER
4. CONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY
IG±30
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IGNITION SYSTEM Engine Speed sensor
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SERVICE SPECIFICATIONS
SERVICE DATA
Ignition timing8±125 BTDC @ idlegg
(w/ Terminals TE1 and E1 connected)
Firing order1±8±4±3±6±5±7±2
Spark plugTypeNDPK20R11g
NGK BKR6EP11
Electrode gapNew plug STD 1.1 mm 0.043 in.
Used plug Limit 1.3 mm 0.051 in.
High±tensionResistance25 k
per cordg
cord
Ignition coilPrimary coil resistance0.40±0.50
gy
Secondary coil resistance10.0±14.0 k

Cam positionResistanceat ±10± +40 5C (14±104 5F)835±1,350

sensor
Engine speedResistanceat ±10± +40 5C (14±104 5F)835±1,350

sensor
TORQUE SPECIFICATIONS
Part tightenedNVmkgf Vcmft Vlbf
Spark plug X Cylinder head1818013
Cam position sensor X Distributor housing18185 13
Distributor cap X Distributor housing3.839 34 in. Vlbf
Distributor rotor X Camshaft timing pulley3.839 34 in. Vlbf
RH No.2 timing belt cover X Cylinder block (for 12 mm head)16160 12
Drive belt idler pulley X Hydraulic pump37380 27
Engine speed sensor X Oil pump6.46556 in. Vlbf
IG±32±
IGNITION SYSTEM Service Specifications
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