Lexus SC300 / Lexus SC400. Manual — part 491
INSPECTION OF KNOCK SENSORS
1.
REMOVE AIR INTAKE CHAMBER
(See steps 1 to 16 on pages
2.
DISCONNECT FUEL INLET HOSE FROM LH DELIVERY
PIPE
Remove the pulsation damper and two gaskets, and discon-
nect the inlet hose.
3. DISCONNECT FUEL RETURN HOSE FROM FUEL
RETURN PIPE
4.
DISCONNECT EGR PIPE FROM RH CYLINDER HEAD
Remove the bolt holding the EGR pipe to the cylinder head,
and disconnect the EGR pipe.
5.
DISCONNECT ENGINE WIRE FROM INTAKE MANIFOLD
Remove the two bolts, and disconnect the engine wire.
6. DISCONNECT ENGINE WIRE FROM DELIVERY PIPES,
REAR WATER BY–PASS JOINT AND RH CYLINDER
HEAD
(a) Remove the four bolts holding the engine wire to the
delivery pipes, and disconnect the engine wire from the
delivery pipe.
(b) Remove
the two bolts holding the engine wire to the rear
water by–pass joint, and disconnect the engine wire
from the rear water by–pass joint.
(c) Remove
the two bolts holding the engine wire to the rear
side of the RH cylinder head, and disconnect the engine
wire from the RH cylinder head.
FI–108
EFI SYSTEM – Electronic Control System (Knock Sensors)
(d) Disconnect the two engine wire connectors from the
connector bracket on the front side of the LH delivery
pipe.
(e) Disconnect the eight injector connectors.
7.
REMOVE FUEL RETURN PIPE
(a) Remove the bolt holding the return pipe to the LH
cylinder head.
(b) Remove the union bolt, two gaskets and return pipe.
8. REMOVE DELIVERY PIPES AND INTAKE MANIFOLD
ASSEMBLY
(a) Remove the six bolts and four nuts holding the intake
manifold to the cylinder heads.
(b) Remove the two delivery pipes and intake manifold
assembly.
(c) Remove the two intake manifold gaskets.
9.
REMOVE KNOCK SENSOR
(a) Disconnect the knock sensor connectors
(b) Using SST, remove the two knock sensors.
SST 09816–30010
10. INSPECT KNOCK SENSOR
Using an ohmmeter, check that there is no continuity be-
tween the terminal and body.
If there is continuity, replace the sensor.
FI–109
EFI SYSTEM – Electronic Control System (Knock Sensors)
11. REINSTALL KNOCK SENSOR
(a) Using SST, remove the two knock sensors.
SST 09816–30010
Torque: 44 N
⋅
m (450 kgf
⋅
cm, 33 ft
⋅
lbf)
(b) Connect the knock sensor connectors.
12. REINSTALL DELIVERY PIPES AND INTAKE MANIFOLD
ASSEMBLY
(a) Place two new gaskets on the cylinder heads with the
white painted mark facing upward.
NOTICE: Align the port holes of the gasket and cylinder
head. Be careful of the installation direction.
(b) Place the delivery pipes and intake manifold assembly
in position on the cylinder heads with the arrow mark on
the intake manifold facing forward.
NOTICE: Be careful of the installation direction.
(c) Install the six mounting bolts and four mounting nuts.
Torque: 18 N
⋅
m (185 kgf
⋅
cm, 13 ft
⋅
lbf)
HINT: Use bolts 30 mm (1.18 in.) in length.
13. REINSTALL FUEL RETURN PIPE
Install the return pipe with two new gaskets, union bolt and
bolt.
Torque (Union bolt):
35 N
⋅
m (360 kgf
⋅
cm, 26 ft
⋅
lbf)
14. REINSTALL ENGINE WIRE TO DELIVERY PIPES, REAR
WATER BY–PASS JOINT AND RH CYLINDER HEAD
(a) Connect the eight injector connectors.
(b) Connect the two engine wire connectors to the
connector bracket on the LH delivery pipe.
FI–110
EFI SYSTEM – Electronic Control System (Knock Sensors)
(c) Install the engine wire to the RH cylinder head with the
two bolts.
(d) Install the engine wire to the rear water by–pass joint
with the two bolts.
(e) Install the engine wire to the delivery pipes with the four
bolts.
15. REINSTALL ENGINE WIRE TO INTAKE MANIFOLD
Install the engine wire with the two bolts.
16. TEMPORARILY
REINSTALL
EGR PIPE TO RH CYLINDER
HEAD
Temporarily Install the EGR pipe with the bolt.
17. RECONNECT FUEL RETURN HOSE TO FUEL RETURN
PIPE
18. RECONNECT FUEL INLET HOSE TO LH DELIVERY PIPE
Using SST, connect the inlet hose with two new gaskets and
pulsation damper.
SST 09612–24014 (09617–24011)
Torque: 39 N
⋅
m (400 kgf
⋅
cm, 29 ft
⋅
lbf)
33 N
⋅
m (340 kgf
⋅
cm, 24 ft
⋅
lbf) for SST
HINT: Use a torque wrench with a fulcrum length of 30 cm
(11.81 in.).
FI–111
EFI SYSTEM – Electronic Control System (Knock Sensors)
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