Lexus SC300 / Lexus SC400. Manual — part 716
4. INSPECT
VSV
A.
Inspect VSV for open circuit
Using an ohmmeter, check that there is continuity between
the terminals.
Resistance (Cold): 30–34
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 the air flows with difficulty from ports E to F.
(b) Apply battery voltage across the terminals.
(c) Check that the air flows without resistance from port E
to F.
If operation is not as specified, replace the VSV.
5. REINSTALL
VSV
(a) Install the VSV with the two bolts.
(b) Connect the two wire clamps to the VSV bracket.
EC–12
–
EMISSION CONTROL SYSTEMS
Fuel Evaporative Emission Control (EVAP) System
(c) Connect the following hoses:
(1) Vacuum hose (from vacuum pipe) to VSV
(2) Vacuum hose (from charcoal canister) to VSV
(d) Connect the VSV connector.
6.
REINSTALL INTAKE AIR CONNECTOR
(a) Connect the end portions of the intake air connector to
the 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 (from ISC valve) to intake air connector
(2) Air
hose (from PS air control valve) to intake air con-
nector
7. RECONNECT
CABLE
TO
NEGATIVE
TERMINAL
OF
BATTERY
INSPECTION OF CHECK VALVE
1.
REMOVE CHECK VALVE
(a) Disconnect the grommet on the check valve from the
bracket.
(b) Remove the check valve from the hose end on the
charcoal canister.
(c) Remove the grommet from the check valve.
2.
INSPECT CHECK VALVE
(a) Check that air flows from the yellow port to the black
port.
(b) Check that air does not flow from the black port to the
yellow port.
If operation is not as specified, replace the check valve.
–
EMISSION CONTROL SYSTEMS
Fuel Evaporative Emission Control (EVAP) System
EC–13
3. REINSTALL
CHECK
VALVE
HINT: Reinstall the check valve with the black port facing the
charcoal canister side.
(a) Install the grommet to the check valve.
(b) Install the check valve to the hose end on the charcoal
canister.
(c) Install the grommet on the check valve to the bracket.
EC–14
–
EMISSION CONTROL SYSTEMS
Fuel Evaporative Emission Control (EVAP) System
EXHAUST GAS RECIRCULATION (EGR) SYSTEM
DESCRIPTION
To reduce NOx emission, part of the exhaust gases are recirculated through the EGR valve to the intake
manifold to lower the maximum combustion temperature.
OPERATION
Coolant Temp.
Condition
EGR Valve
Exhaust Gas
Below 53
°
C (127
°
F)
–
CLOSED
Not recirculated
Above 55
°
C (131
°
F)
(a)
Idling, Deceleration, Neutral,
Low air volume, High Engine speed
CLOSED
Not recirculated
Above 55 C (131 F)
Except (a)
OPEN
*Recirculated
* The ECU calculates the appropriate number of steps according to the intake air volume and the engine speed, then
drives the stepping motor to maintain the EGR volume at a level appropriate to the driving conditions.
–
EMISSION CONTROL SYSTEMS
Exhaust Gas Recirculation (EGR) System
EC–15
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