ect LEXUS SC300 1991 Service Repair Manual

RECOMMENDED TOOLS
IllustrationPart No.Part NameNote
09082±0015TOYOTA
Electrical Tester
09200±00010Engine Adjust
Kit
09258±00030Hose Plug Set
Plug for the Vacuum hose, fuel hose ect.
EQUIPMENT
Part NameNote
Graduated cylinderInjector
Tachometer
Torque wrench
SSM (SERVICE SPECIAL MATERIALS)
Part NamePart No.Use etc.
Seal packing 1282B,08826±00100Water inlet housing
Three bond 1282B or equivalent
FI±11EFI SYSTEM ± Preparation
WhereEverybodyKnowsYourName

PRECAUTIONS
1. Before working on the fuel system, disconnect the cablefrom negative (±) terminal of the battery.
HINT: Any diagnostic code retained by the computer will be
erased when the battery terminal is removed. Therefore, if
necessary, read the diagnosis before removing the battery
terminal.
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 negative (±) terminal
cable is disconnected from the battery.
2. Do not smoke or work on open flame when working on the fuel system.
3. Keep gasoline away from rubber or leather parts.
INSPECTION PRECAUTIONS
MAINTENANCE PRECAUTIONS
1. CHECK CORRECT ENGINE TUNE±UP (See page EM±8)
2. PRECAUTIONS WHEN CONNECTING GAUGE (a) Use the battery as the power source for the timing light,tachometer, etc.
(b) Connect the test probe of a tachometer to the terminal IG of the check connector.
3. IN EVENT OF ENGINE MISFIRE, FOLLOWING PRECAUTIONS SHOULD BE TAKEN
(a) Check proper connection of battery terminals, etc.
(b) Handle high±tension cords carefully.
(c) After repair work, check that the ignition coil terminalsand all other ignition system lines are reconnected
securely.
(d) When cleaning the engine compartment, be especially careful to protect the electrical system from water.
4. PRECAUTIONS WHEN HANDLING OXYGEN SENSOR (a) Do not allow oxygen sensor to drop or hit against anobject.
(b) Do not allow the sensor to come into contact with water.
FI±12
± Precautions, Inspection PrecautionsEFI SYSTEM
WhereEverybodyKnowsYourName

FUEL SYSTEM
Fuel Pump
ON±VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION(a) Using SST, connect terminals +B and FP of the check
(ºDIAGNOSISº) connector.
SST 09843±18020
(b) Turn the ignition switch ON.
NOTICE: Do not start the engine.
(c) Check that there is pressure in the fuel inlet hose from the fuel filter.
HINT: At this time, you will hear fuel return noise.
(d) Turn the ignition switch OFF.
(e) Remove SST from the check connector.
SST 09843±18020 FI±17
± Fuel System (Fuel Pump)EFI SYSTEM
WhereEverybodyKnowsYourName

If there is no pressure, check the following parts:w Fuses
w EFI main relay
w Fuel pump ECU
w Fuel pump
w Engine & ECT ECU
w Wiring connections
2. CHECK FUEL PRESSURE (a) Check the battery voltage above 12 volts.
(b) Disconnect the cable from the negative (±) terminal ofthe 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 negative (±) terminal
cable is disconnected from the battery.
(c) (Exc. USA Spec.) Remove the filter from the VSV (for EGR system).
(d) Remove the union bolt holding the LH deliver pipe to the
rear fuel pipe. Remove the two gaskets.
HINT:
w Put a suitable container or shop towel under the cold
start injector pipe.
w Slowly loosen the union bolt.
(e) Install the rear fuel pipe and SST (pressure gauge) to the LH delivery pipe with three new gaskets and the
union bolt.
SST 09268±45012
Torque: 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
(f) Wipe off any splattered gasoline.
(g) (Exc. USA Spec.)
Reinstall the filter to the VSV.
(h) Using SST, connect terminals B and FP of the check (ºDIAGNOSISº) connector.
SST 09843±18020
(i) Reconnect the cable to the negative (±) terminal of the
battery.
FI±18
EFI SYSTEM
± Fuel System (Fuel Pump)
WhereEverybodyKnowsYourName

(j) Turn the ignition switch ON.
(k) Measure the fuel pressure.
Fuel pressure: 265±304 kPa(2.7±3.1 kgf/cm
2, 38±44 psi)
If pressure is high, replace the fuel pressure regulator.
If pressure is low, check the following parts:w Fuel hoses and connections
w Fuel pump
w Fuel filter
w Fuel pressure regulator
(l) Remove SST from the check connector.
SST 09843±18020
(m) Start the engine.
(n) Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
(o) Measure the fuel pressure at idling.
Fuel pressure: 265±304 kPa
(2.7±3.1 kgf/cm
2, 38±44 psi)
(p) Re connect the vacuum sensing hose to the fuel
pressure regulator.
(q) Measure the fuel pressure at idling.
Fuel pressure: 196±235 kPa
(2.0±2.4 kgf/cm
2, 28±34 psi)
If pressure is not as specified, check the vacuum sensing
hose and fuel pressure regulator.
(r) Stop the engine. Check that the fuel pressure remains147 kPa (1.5 kgf/cm
2, 21 psi) or more for 5 minutes after
the engine is turned off.
If pressure is not as specified, check the fuel pump, pressure
regulator and/or injectors.
(s) After checking fuel pressure, disconnect the battery negative (±) cable and carefully remove the SST to
prevent gasoline from splashing.
SST 09268±45012
(t) Connect the rear fuel pipe to the delivery pipe with two new gaskets and the union bolt.
Torque: 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
(u) (Exc. USA spec.)
Reinstall the filter to the VSV.
(v) Reconnect the cable to the negative (±) terminal of the
battery.
(w) Check for fuel leaks. (See page FI±16) FI±19
EFI SYSTEM
± Fuel System (Fuel Pump)
WhereEverybodyKnowsYourName

REMOVAL OF FUEL PUMP
(See Components on page FI±20)
CAUTION: Do not smoke or work near an open flame
when working on the fuel pump.
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 negative (±) terminal
cable is disconnected from the battery.
2. REMOVE LUGGAGE COMPARTMENT FLOOR MAT
3. REMOVE SPARE TIRE
4. REMOVE LUGGAGE COMPARTMENT TRIM COVER
5. DISCONNECT FUEL PUMP CONNECTOR
6. REMOVE SEAT CUSHION AND BACK
7. REMOVE PARTITION COVER Using a scraper, pry out the partition cover.
8. REMOVE FUEL PUMP (a) Remove the eight bolts, and disconnect the fuel pumpset plate from the fuel tank.
(b) Remove the three nuts, and disconnect the fuel pump bracket from the fuel tank.
(c) Disconnect the fuel hose from the fuel pump bracket, and remove the fuel pump, bracket and set plate
assembly. FI±21
EFI SYSTEM
± Fuel System (Fuel Pump)
WhereEverybodyKnowsYourName

INSPECTION OF FUEL PUMP
1. INSPECT FUEL PUMP RESISTANCEUsing an ohmmeter, measure the resistance between the ter-
minals.
Resistance: 0.2±3.0

If the resistance is not as specified, replace the fuel pump
and/or set plate.
2. INSPECT FUEL PUMP OPERATION Connect the positive (+) lead from the battery to terminal 1 of
the connector, and the negative (±) lead to terminal 2. Check
that the fuel pump operates.
NOTICE:
w These tests must be performed quickly (within 10
seconds) to prevent the coil from burning out.
w Keep the fuel pump as far away from the battery as
possible.
w Always perform switching at the battery side.
If operation is not as specified, replace the fuel pump and/or
set plate.
COMPONENTS FOR DISASSEMBLY AND
ASSEMBLY
FI±22EFI SYSTEM ± Fuel System (Fuel Pump)
WhereEverybodyKnowsYourName

DISASSEMBLY OF FUEL PUMP
(See Components on page FI±22)
1. REMOVE PUMP SET PLATE FROM FUEL PUMP Disconnect the lead connector from the fuel pump, and re-
move the set plate.
2. REMOVE FUEL PUMP FROM PUMP BRACKET (a) Pull out the lower side of the fuel pump from the pumpbracket.
(b) Remove the rubber cushion from the fuel pump.
(c) Disc onnect the fuel hose from the fuel pump, and
remove the fuel pump.
3. REMOVE FUEL PUMP FILTER FROM FUEL PUMP (a) Using a small screwdriver, remove the clip.
(b) Pull out the pump filter.
ASSEMBLY OF FUEL PUMP
(See Components on page FI±22)
1. INSTALL FUEL PUMP FILTER TO FUEL PUMP Install the pump filter with a new clip.
2. INSTALL FUEL PUMP TO FUEL PUMP BRACKET (a) Connect the fuel hose to the outlet port of the fuel pump.
(b) Install the rubber cushion to the fuel pump.
(c) Install the fuel pump by pushing the lower side of the fuel
pump.
3. INSTALL PUMP SET PLATE TO FUEL PUMP Connect the lead connector on the set plate to the fuel pump.FI±23
EFI SYSTEM
± Fuel System (Fuel Pump)
WhereEverybodyKnowsYourName

INSTALLATION OF FUEL PUMP
(See Components on page FI±20)
1. INSTALL FUEL PUMP (a) Install a new gasket to the pump set plate.
(b) Connect the fuel hose to the fuel pump bracket, andinstall the fuel pump and bracket assembly with the
three nuts.
Torque: 5.4 N Vm (55 kgf Vcm, 48 in. Vlbf)
(b) Install the fuel pump set plate with the eight bolts.
Torque: 3.9 N Vm (40 kgf Vcm, 35 in. Vlbf)
2. INSTALL PARTITION COVER
Install the partition cover with butyl tape.
3. INSTALL SEAT BACK AND CUSHION
4. CONNECT FUEL PUMP CONNECTOR
5. INSTALL LUGGAGE COMPARTMENT TRIM COVER
6. INSTALL SPARE TIRE
7. INSTALL LUGGAGE COMPARTMENT FLOOR MAT
8. CONNECT CABLE TO NEGATIVE TERMINAL OF BATTERY
9. START ENGINE, AND CHECK FOR FUEL LEAKS
FI±24
EFI SYSTEM
± Fuel System (Fuel Pump)
WhereEverybodyKnowsYourName

Cold Start Injector
FI±25 ± Fuel System (Cold Start Injector)EFI SYSTEM
WhereEverybodyKnowsYourName