ect LEXUS SC300 1991 Service Repair Manual

4. INSTALL ENGINE WIRE TO DELIVERY PIPES, REARWATER BY±PASS JOINT AND RH CYLINDER HEAD
(a) Connect the eight injector connectors.
(b) C onnect the two engine wire connectors to the
connector bracket on the LH delivery pipe.
(c) Install the engine wire to the RH cylinder head with the two bolts.
(d) Install the engine wire to the rear water by±pass joint
with the two bolts.
(e) Install the engine wire to the delivery pipes with the four bolts.
5. INSTALL ENGINE WIRE TO INTAKE MANIFOLD Install the engine wire with the two bolts.
6. TEMPORARILY INSTALL EGR PIPE TO RH CYLINDER HEAD
Temporarily Install the EGR pipe with the bolt.
FI±56
EFI SYSTEM
± Fuel System (Injectors)
WhereEverybodyKnowsYourName

7. CONNECT FUEL RETURN HOSE TO FUEL RETURN PIPE
8. CONNECT FUEL INLET HOSE TO LH DELIVERY PIPE Using SST, connect the inlet hose with two new gaskets and
pulsation 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.).
9. INSTALL AIR INTAKE CHAMBER (See steps 2 to 18 on pages FI±35 to 41)
HINT: After the air intake chamber installed, tighten the bolt
holding to the EGR pipe to the RH cylinder head. FI±57
EFI SYSTEM
± Fuel System (Injectors)
WhereEverybodyKnowsYourName

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)
WhereEverybodyKnowsYourName

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)
WhereEverybodyKnowsYourName

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)
WhereEverybodyKnowsYourName

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
WhereEverybodyKnowsYourName

COMPONENTS
REMOVAL OF AIR FLOW METER
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. DISCONNECT AIR FLOW METER CONNECTOR
(a) Disconnect the air flow meter connector.
(b) Disconnect the wire clamp from the clamp bracket onthe air flow meter.
3. REMOVE AIR CLEANER CASE AND AIR FLOW METER ASSEMBLY
(a) Loosen the hose clamp.
(b) Remove the four mounting bolts.
(c) Disconnect the air cleaner hose from the air flow meter.
(d) Disconnect the air duct from the air cleaner case, andremove the air cleaner case and air flow meter
assembly.
FI±64
EFI SYSTEM
± Air Induction System (Air Flow Meter)
WhereEverybodyKnowsYourName

4. REMOVE AIR FLOW METER FROM AIR CLEANER CASERemove the four bolts and air flow meter and gasket.
INSPECTION OF AIR FLOW METER
INSPECT AIR FLOW METERCheck that the honey±combed is neither deformed nor
damaged.
If necessary, replace the air flow meter.
INSTALLATION OF AIR FLOW METER
(See Components on page FI±64)
1. INSTALL AIR FLOW METER FROM AIR CLEANER CASE Install a new gasket and the air flow meter with the four bolts.
Torque: 10 N Vm (100 kgf Vcm, 7 ft Vlbf)
2. INSTALL AIR CLEANER CAP AND AIR FLOW METER
ASSEMBLY
(a) Connect the air cleaner case to the air duct.
(b) Connect the air flow meter to the air cleaner hose.
(c) Install the air cleaner and air flow meter assembly withthe four bolts.
(d) Tighten the hose clamp.
3. CONNECT AIR FLOW METER CONNECTOR (a) Connect the air flow meter connector.
(b) Install the wire clamp to the clamp bracket on the air flow
meter.
4. CONNECT CABLE FROM NEGATIVE TERMINAL OF BATTERY FI±65
EFI SYSTEM
± Air Induction System (Air Flow Meter)
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

REMOVAL OF THROTTLE BODY
(See Components on page FI±69)
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. DRAIN ENGINE COOLANT (See page CO±6)
3. REMOVE THROTTLE BODY COVER (a) Remove the mounting cap nut.
(b) Loosen the two bolts, and remove the throttle bodycover.
4. DISCONNECT CONTROL CABLES FROM THROTTLE BODY
Disconnect the following cables:(1) Accelerator cable
(2) A/T throttle control cable
(3) (w/ Cruise Control System)
Cruise control actuator cable
5. 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
(b) Remove the bolt holding the intake air connector to the cylinder head cover.
(c) Loosen the two hose clamps.
(d) Disconnect the intake air connector from the throttle body and air cleaner hose, and remove the intake air
connector.
FI±70
EFI SYSTEM
± Air Induction System (Throttle Body)
WhereEverybodyKnowsYourName