Lexus SC300 / Lexus SC400. Service manual — part 469

Injectors

ON–VEHICLE INSPECTION

INSPECT INJECTOR RESISTANCE

(a) Remove the engine wire covers and throttle body.

(See steps 1 to 8 and 13 on pages

FI–27

to 30)

(b) Disconnect the injector connectors.
(c) Using an ohmmeter, measure the resistance between

the terminals.

Resistance: 13.4–14.2

If the resistance is not as specified, replace the injector.
(d) Reconnect the injector connectors.
(e) Reinstall the throttle body and engine wire covers.

(See steps 5 and 10 to 18 on pages

FI–38

to 41)

FI–48

– Fuel System (Injectors)

EFI SYSTEM

COMPONENTS FOR REMOVAL AND INSTALLATION

FI–49

EFI SYSTEM – Fuel System (Injectors)

REMOVAL OF INJECTORS

(See Components on page

FI–49

)

1.

REMOVE AIR INTAKE CHAMBER
(See steps 1 to 16 on pages

FI–27

to 32)

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

AND REAR WATER BY–PASS JOINT
(a) Remove the four bolts holding the engine wire to the

delivery pipes, and disconnect the engine wire from the
delivery pipes.

(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–50

EFI SYSTEM – Fuel System (Injectors)

(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 connector.

7.

REMOVE FUEL RETURN PIPE
(a) Remove the bolt holding the return pipe to the LH

cylinder head.

(b) Remove

the union bolt and two gaskets and return pipe.

8.

REMOVE DELIVERY PIPES AND INJECTORS
(a) Remove the four nuts holding the delivery pipe to the

intake manifold.

(b) Remove the connector bracket, the two delivery pipes

and eight injector assembly, four spacers and eight
insulators.

NOTICE: Be careful not to drop the injectors, when re-
moving the delivery pipe.

(c) Pull out the eight injectors from the delivery pipes.
(d) Remove the O–ring and grommet from each injector.

FI–51

EFI SYSTEM – Fuel System (Injectors)