ect LEXUS SC300 1991 Service Repair Manual

COMPONENTS FOR REMOVAL AND INSTALLATION
FI±26EFI SYSTEM ± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName

REMOVAL OF COLD START INJECTOR
(See Components on page FI±26)
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±27
EFI SYSTEM
± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName

6. 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.
7. REMOVE RH ENGINE WIRE COVER Remove the bolt and wire cover.
8. REMOVE LH ENGINE WIRE COVER Remove the two bolts and wire cover.
9. REMOVE VSV FOR EVAP SYSTEM Remove the two bolts, and disconnect the VSV from cylinder
head and timing belt cover.
10. REMOVE RH NO.3 TIMING BELT COVER Remove the three bolts and timing belt cover.
FI±28
EFI SYSTEM
± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName

11. REMOVE LH NO.3 TIMING BELT COVER(a) Remove the four mounting bolts.
(b) Disconnect the cord grommet from the timing belt cover,
and remove the timing belt cover.
(c) Remove the cord grommet from the high±tension cord.
12. REMOVE LOWER HIGH±TENSION CORD COVER (a) Disconnect the high±tension cord from the RH ignitioncoil.
(b) D i s c onnect the high±tension cords from the
high±tension cord cover.
(c) Remove the bolt and cord cover.
13. REMOVE THROTTLE BODY (a) Disconnect the following connectors:(1) Throttle position sensor connector
(2) (w/ TRAC) Sub±throttle position sensor connector
(3) (w/ TRAC) Sub±throttle actuator connector
(b) Disconnect the following hoses: (1) Heater water hose from heater water valve FI±29
EFI SYSTEM
± Fuel System (Cold Start Injector)
WhereEverybodyKnowsYourName

(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