torque LEXUS SC400 1991 Service Repair Manual

(h) Turn the ignition switch ON.
(i) Measure the fuel pressure.
Fuel pressure: 265±304 kPa (2.7±3.1 kgf/cm, 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
(j) Remove SST from the check connector.
SST 09843±18020
(k) Start the engine.
(l) Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
(m) Measure the fuel pressure at idle.
Fuel pressure: 265±304 kPa
(2.7±3.1 kgf/cm, 38±44 psi)
(n) Re c onnect the vacuum sensing hose to the fuel
pressure regulator.
(o) Measure the fuel pressure at idle.
Fuel pressure: 196±235 kPa
(2.0±2.4 kgf/cm, 28±34 psi)
If pressure is not as specified, check the vacuum sensing
hose and fuel pressure regulator.
(p) Stop the engine. Check that the fuel pressure remains147 kPa (1.5 kgf/cm2, 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.
(q) After checking fuel pressure, disconnect the battery
negative (±) cable and carefully remove SST to prevent
gasoline from splashing.
SST 09268±45012
(r) Connect the No. 1 fuel pipe to the delivery pipe with two new gaskets and the union bolt.
Torque: 42 N Vm (420 kgf Vcm, 30 ft Vlbf)
(s) Reconnect the cable to the negative (±) terminal of the
battery.
(t) Check for fuel leaks. (See page FI±15)
FI±18
±
EFI SYSTEM Fuel System (Fuel Pump)
WhereEverybodyKnowsYourName

INSTALLATION OF FUEL PUMP
(See Components on page FI±19)
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
±
EFI SYSTEM Fuel System (Fuel Pump)FI±23
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

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

INSTALLATION OF FUEL PRESSURE
REGULATOR
(See components on page FI±24)
1. INSTALL FUEL PRESSURE REGULATOR AND FUEL RETURN PIPE
(a) Apply a light coat of gasoline to a new O±ring, and install
it to the pressure regulator.
(b) Install the pressure regulator with the two bolts.
Torque: 8.8 N Vm (90 kgf Vcm, 78 in. Vlbf)
2. CONNECT NO. 2 FUEL PIPE TO FUEL PRESSURE
REGULATOR
Connect the fuel pipe to the pressure regulator with new two
gaskets and the union bolt.
Torque: 27 N Vm (280 kgf Vcm, 20 ft Vlbf)
3. CONNECT VACUUM SENSING HOSE TO FUEL
PRESSURE REGULATOR
4. CHECK FOR FUEL LEAKS (See page FI±15)
±
EFI SYSTEM Fuel System (Fuel Pressure Regulator)FI±25
WhereEverybodyKnowsYourName

(b) Remove the union bolt, two gasket, and cold startinjector tube.
(c) Remove the two bolts, cold start injector and gasket.
INSPECTION OF COLD START INJECTOR
1. INSPECT RESISTANCE OF COLD START INJECTOR (a) Disconnect the cold start injector connector.
(b) Using an ohmmeter, measure the resistance betweenthe terminals.
Resistance: 2±4

If the resistance is not as specified, replace the cold start
injector.
(c) Reconnect the cold start injector connector.
2. INSPECT INJECTION OF COLD START INJECTOR CAUTION: Keep clear of sparks during the test.
(a) Install SST (two unions) to the injector and delivery pipe
with four new gaskets and the union bolts.
SST 09268±41045 (09268±41080)
Torque: 180 kg±cm (13 ft±lb, 18 N Vm)
(b) Connect SST (hose) to the unions.
SST 09268±41045
(c) Connect SST (wire) to the injector.
SST 09842±30055
(d) Put a container under the injector. FI±33
EFI SYSTEM
± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName

INSTALLATION OF COLD START
INJECTOR
(See Components on page FI±26)
1. INSTALL COLD START INJECTOR (a) Install a new gasket and the injector with the two bolts.
Torque: 7.8 N Vm (80 kgf Vcm, 69 in. Vlbf)
(b) Install the cold start injector tube with a new gasket and
the union bolt.
Torque: 15 N Vm (150 kgf Vcm, 11 ft Vlbf)
(c) Connect the cold start injector connector.
2. INSTALL AIR INTAKE CHAMBER (a) Place four new gaskets and the air intake chamber onthe intake manifold. FI±35
EFI SYSTEM
± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName

(b) Temporarily install a new gasket and the EGR pipe to air
intake chamber with the two bolt.
(c) (Exc. USA Spec.) Install the connector bracket to check (ºDIAGNOSISº)
connector.
(d) Install the air intake chamber and following parts with the four bolts and eight nuts:
(1) Check (ºDIAGNOSISº) connector
(2) A/T throttle cable bracket
(3) VSV for fuel pressure control system
(4) VSV for EGR system
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT: Use bolts 40 mm (1.57 in.) of length.
(e) Tighten the bolt holding the EGR pipe to the air intake
chamber.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
(f) Connect the cold start injector tube to the RH delivery
pipe with two new gaskets and union bolt.
Torque: 15 N Vm (150 kgf Vcm, 11 ft Vlbf)
FI±36EFI SYSTEM ± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName

4. CONNECT CONNECTORSConnect the following connectors:w Cold start injector connector
w ISC valve connector
w (USA Spec.)
EGR valve connector
w (Exc. USA Spec.)
VSV connector for EGR system
w SV connector for fuel pressure control system
5. INSTALL THROTTLE BODY (a) Connect the following hoses:(1) PCV hose to throttle body
(2) Water by±pass hose to throttle body
(b) Install a new gasket and throttle body with the two bolts and two nuts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT: Use bolts 40 mm (1.57 in.) in length.
(c) Install the water by±pass pipe (from rear water bypass
joint) to the clamp on the engine wire cover.
(d) Connect the following hoses: (1) Water by±pass hose to the ISC valve
(2) (USA Spec.) Vacuum hose to throttle body
(3) (Exc. USA Spec.) Three vacuum hoses to throttle body
FI±38
EFI SYSTEM
± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName