LEXUS SC400 1991 Service Repair Manual

(2) Water by±pass hose from ISC valve
(3) (USA Spec.)Vacuum hose
(4) (Exc. USA Spec.) Three vacuum hoses
(c) Remove the two bolts and two nuts, disconnect the throttle body from the air intake chamber.
(d) Disconnect the following hoses, and remove the throttle body:
(1) PCV hose from throttle body
(2) Water by±pass hose from throttle body
(e) Remove the throttle body gasket.
14. DISCONNECT CONNECTORS Disconnect the following connectors:w Cold start injector connector
w ISC valve connector
w (USA Spec.)
EGR valve connector for EGR system
w (Exc. USA Spec.)
VSV connector for EGR
w VSV connector for fuel pressure control system
FI±30
EFI SYSTEM
± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName

15. DISCONNECT HOSESDisconnect the following hoses:(1) Water by±pass hose (from water inlet housing) from ISC valve
(2) Vacuum hose (from PS air control valve) from air in-
take chamber
(3) Vacuum sensing hose (from fuel pressure regula- tor) from vacuum pipe
(4) Two vacuum hoses (from VSV for EVAP system) from vacuum pipe
(5) Vacuum hose (from charcoal canister) from vacu- um pipe
(6) Water by±pass hose (from EGR valve) from water by±pass pipe
(7) Vacuum hose (from brake booster) from air intake
chamber
(8) Vacuum hose (from VSV for heater water valve) from air intake chamber
(9) PCV hose from LH cylinder head cover
16. REMOVE AIR INTAKE CHAMBER (a) Remove the bolt, stud bolt and accelerator bracket. FI±31
EFI SYSTEM
± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName

(b) Remove the union bolt and two gaskets, and disconnectthe cold start injector tube from the RH delivery pipe.
(c) Remove the two bolts and gasket, and disconnect the EGR pipe from the air intake chamber.
(d) Remove the four bolts, eight nuts and A/T throttle cable bracket.
(e) (USA Spec.)
Disconnect the check (ºDIAGNOSISº) connector brack-
et from the air intake chamber.
(f) (Exc. USA Spec.) Remove the connector bracket from the check (DIAG-
NOSISº) connector
(g) Remove the air intake chamber assembly and four gaskets.
17. REMOVE COLD START INJECTOR FROM AIR INTAKE CHAMBER
(a) Disconnect the cold start injector connector.
FI±32
EFI SYSTEM
± Fuel System (Cold Start Injector)
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

(e) Using SST, connect terminals +B and FP of the check(ºDIAGNOSISº) connector.
SST 09843±18020
(f) Reconnect the cable to the negative (±) terminal of the
battery.
(g) Turn the ignition switch ON.
NOTICE: Do not start the engine.
(h) Connect the test probes of the SST (wire) to the battery, and check that the fuel spray is as shown.
SST 09842±30055
NOTICE: Perform this check within the shortest possible
time.
3. INSPECT LEAKAGE (a) In the condition above, disconnect the test probes ofSST (wire) from the battery and check fuel leakage from
the injector.
SST 09842±30055
Fuel drop: One drop or less per minute
(b) Disconnect the cable from the negative (±) terminal of the battery.
(c) Remove SST.
SST 09268±41045, 09842±30050 and 09843±18020
FI±34
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

(g) Install the accelerator bracket with the bolt and stud bolt.
3. CONNECT HOSES Connect the following hoses:(1) Water by±pass hose (from EGR valve) to water by±
pass pipe
(2) Vacuum hose (from brake booster) to air intake chamber
(3) Vacuum hose (from VSV for heater water valve) to
air intake chamber
(4) PCV hose to LH cylinder head cover
(5) Water by±pass hose (from water inlet housing) to ISC valve
(6) Vacuum hose (from PS air control valve) to air in- take chamber
(7) Vacuum sensing hose (from fuel pressure regula- tor) to vacuum pipe
(8) Two vacuum hoses (from VSV for EVAP system) to
vacuum pipe
(9) Vacuum hose (from charcoal canister) to vacuum pipe FI±37
EFI 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

(4) Heater water hose to heater water valve
(e) Connect the following connectors: (1) Throttle position sensor connector
(2) (w/ TRAC)
Sub±throttle position sensor connector
(3) (w/ TRAC) Sub±throttle actuator connector
5. INSTALL LOWER HIGH±TENSION CORD COVER (a) Connect the end portions of the high±tension cord to the
cord clamps
(b) Install the high±tension cord cover with the bolt.
(c) Install the clamps on the high±tension cords to the
high±tension cord cover.
(d) Connect the high±tension cord to the RH ignition coil.
7. INSTALL RH NO.3 TIMING BELT COVER (a) Install the three gaskets to the timing belt cover.
(b) Fit portion A of the timing belt cover, matching it with the
lower high±tension cord cover.
(c) Install the timing belt cover with the three bolts. FI±39
EFI SYSTEM
± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName