ect LEXUS SC300 1991 Service Repair Manual

(5) Water by±pass hose (from water inlet housing) to ISC
valve
(6) Vacuum hose (from PS air control valve) to air intake chamber
(7) Vacuum sensing hose (from fuel pressure regulator) to vacuum pipe
(8) Two vacuum hoses (from VSV for EVAP system) to vacuum pipe
(9) Vacuum hose (from charcoal canister) to vacuum pipe.
14. CONNECT CONNECTORS Connect 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 VSV connector for fuel pressure control system
15. 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.
ST±30
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STARTING SYSTEM Starter
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(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
(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
16. 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.
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STARTING SYSTEM StarterST±31
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(c) Install the clamps on the high±tension cords to thehigh±tension cord cover.
(d) Connect the high±tension cord to the RH ignition coil.
17. 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.
18. INSTALL VSV FOR EVAP SYSTEM Install the VSV with the two bolts.
19. INSTALL LH NO.3 TIMING BELT COVER (a) Install the three gaskets to the timing belt cover.
(b) Install the cord grommet to the high±tension cord.
(c) Install the cord grommet to the timing belt cover.
(d) Fit portion A of the timing belt cover, matching it with the
lower high±tension cord cover.
(e) Install the timing belt cover with the four bolts.
20. INSTALL RH ENGINE WIRE COVER (a) Fit portions A and B of the engine wire cover, matchingthem with the lower high±tension cord cover and No.3
timing belt cover.
(d) Install the engine wire cover with the bolt.
ST±32
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STARTING SYSTEM Starter
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21. 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.
22. INSTALL UPPER HIGH±TENSION CORD COVER (a) Fit portion A of the upper high±tension cover, matchingit 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.
23. INSTALL INTAKE AIR CONNECTOR (a) Connect the end portions of the intake air connector tothe throttle body and air cleaner hose.
(b) Tighten the two hose clamps.
(c) Install the bolt holding the intake air connector to the cylinder head cover.
(d) Connect the following hoses: (1) Air hose to ISC valve
(2) Air hose (from PS air control valve) to intake air connector
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STARTING SYSTEM StarterST±33
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24. CONNECT CONTROL CABLES TO THROTTLE BODYConnect the following hoses:(1) Accelerator cable
(2) A/T throttle control cable
(3) (w/ Cruise Control System) Cruise control actuator cable
25. INSTALL THROTTLE BODY COVER Install the throttle body cover and hose clamp with the two
bolts and cap nut.
26. C O N N E C T C A B L E TO N E G AT I V E T E R M I N A L O F BATTERY
27. FILL WITH ENGINE COOLANT (See page CO±7)
28. CHECK THAT ENGINE STARTS
ST±34
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STARTING SYSTEM Starter
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STARTER RELAY
INSPECTION OF STARTER RELAY
(See page ST±2)
1. INSPECT RELAY CONTINUITY (a) Using an ohmmeter, check that there is continuity
between terminals 1 and 2.
(b) Check that there is no continuity between terminals 3 and 5.
If continuity is not as specified, replace the relay.
2. INSPECT RELAY OPERATION (a) Apply battery voltage across terminals 1 and 2.
(b) Using an ohmmeter, check that there is continuitybetween terminals 3 and 5.
If operation is not as specified, replace the relay.
NEUTRAL START SWITCH
(See AT section)
THEFT DETERRENT SYSTEM
(See BE Section)
ST±14
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STARTING SYSTEM Starter Relay
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STARTER RELAY
INSPECTION OF STARTER RELAY
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OFBATTERY
CAUTION: Work must be started after approx. 20 seconds or
longer from the time the ignition switch is turned to the
ºLOCKº position and the negative (±) terminal cable is dis-
connected from the battery.
2. REMOVE STATER RELAY LOCATION: In the engine compartment relay box.
3. INSPECT STARTER RELAY
A. Inspect relay continuity
(a) Using an ohmmeter, check that there is continuitybetween terminals 1 and 2.
(b) Check that there is no continuity between terminals 3 and 5.
If continuity is not as specified, replace the relay.
B. Inspect relay operation (a) Apply battery voltage across terminals 1 and 2.
(b) Using an ohmmeter, check that there is continuitybetween terminals 3 and 5.
If operation is not as specified, replace the relay.
4. REINSTALL STARTER RELAY
5. RECONNECT CABLE TO NEGATIVE TERMINAL OF BATTERY
NEUTRAL START SWITCH
(See AT section)
THEFT DETERRENT SYSTEM
(See BE section)
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STARTING SYSTEM Starter Relay, Neutral Start Switch, Theft Deterrent
SystemST±35
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NGOK
OKNG
INSPECTION PROCEDURE
1Check voltage between terminals +B and GND of ECU connector.
C
OK
PRemove ECU with connectors still connected.
Measure voltage between terminals +B and GND of
ECU connector.
Voltage: 10 ± 14 V
Proceed to next circuit inspection shown on matrix chart
(See page SR±52).
2Check continuity between terminal GND of ECU connector and body ground.
OK
PMeasure resistance between terminal GND of ECU con-
nector and body ground.
Condition: Continuity
Repair or replace harness or connector.
Go to Step
.
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STEERING STEERING COLUMNSR±67
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OKNG
3Check PWR fusible link.
C
OK
PRemove PWR fusible link from J/B No. 1.
Check continuity of PWR fusible link.
Continuity
Check for short in all the harness and components con-
nected to the PWR fusible link (See attached wiring dia-
gram ).
Check harness and connector between ECU and
battery (See page
IN±33).
SR±68±
STEERING STEERING COLUMN
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OKNG
OKNG
OKNG
INSPECTION PROCEDURE
1Check voltage between terminals VC and E1 of ECU connector.
C
OK
PRemove ECU with connectors still connected.
Measure voltage between terminals V
C and E1 of ECU
connector.
Voltage: 4 ± 6 V
Go to Step
.
2Check for open in harness and connector between terminals Vc and E1 of ECU connector.
Repair or replace harness or connector.
Proceed to next circuit inspection shown on ma-
trix chart (See page SR±52).
3Check for short in harness between terminal VC and E1 of ECU connector.
Repair or replace harness or connector.
Check and replace ECU.
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STEERING STEERING COLUMNSR±71
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