Lexus SC300 / Lexus SC400. Manual — part 618

COMPONENTS FOR REMOVAL AND INSTALLATION

FI–91

EFI SYSTEM – Electronic Control System (VSV for Fuel Pressure Control)

INSPECTION OF VSV FOR FUEL
PRESSURE CONTROL

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 ”LOCK” position and the negative (–) termi-
nal cable is disconnected from the battery.

2. REMOVE

VSV

(a) Disconnect the VSV connector.
(b) Disconnect the following hoses from VSV:

(1)

Vacuum hose (from fuel pressure regulator)

(2)

Vacuum hose (from air intake chamber)

(c) (Exc. USA Spec.)

Remove the bolt holding the water by–pass pipe to the
VSV.

(d) Remove the bolt and VSV.

FI–92

EFI SYSTEM – Electronic Control System (VSV for Fuel Pressure Control)

3. INSPECT

VSV

A. Inspect VSV for open circuit

Using an ohmmeter, check that there is continuity between
the terminals.

Resistance (Cold): 37–44

If there is no continuity, replace the VSV.

B.

Inspect VSV for ground
Using an ohmmeter, check that there is no continuity be-
tween each terminal and the body.
If there is continuity, replace the VSV.

C.

Inspect VSV operation
(a) Check that air flows from ports E to G.

(b) Apply battery voltage across the terminals.
(c) Check that air flows from ports E to the filter.
If operation is not as specified, replace the VSV.

4. REINSTALL

VSV

(a) Install the VSV with the bolt.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

FI–93

EFI SYSTEM – Electronic Control System (VSV for Fuel Pressure Control)

(b) (Exc. USA Spec.)

Install the water by–pass pipe to the VSV with the bolt.

(c) Connect the following hoses to VSV:

(1) Vacuum hose (from fuel pressure regulator)
(2) Vacuum hose (from air intake chamber)

(d) Connect the VSV connector.

5. RECONNECT CABLE TO NEGATIVE TERMINAL OF

BATTERY

FI–94

EFI SYSTEM – Electronic Control System (VSV for Fuel Pressure Control)