Daihatsu F300 Service Manual page 1362

• 2. Check of EGA valve seating
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•
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Start the engine. Ensure that the engine starts and runs
smoothly at the idle speed.
If the engine will not idle smoothly, perform the unit inspec-
tion of the EGR valve.
3. Check of EGA VSV with engine in cold state
Ensure that no vacuum is applied to the vacuum gauge
even if the engine is raced when the coolant temperature
is below 39°C.
If a negative pressure is applied to the vacuum gauge,
check the EGR VSV and/or the water temperature sensor.
4. Check of EGA VSV with engine in hot state
(1) Warm up the engine.
(2) Run the engine at a speed of about 3000 rpm. Ensure
that a negative pressure is applied to the vacuum
gauge .
5. Check of EGR valve
(1) Connect a MityVac directly to the EGA valve.
(2) Apply a negaf1ve pressure to the EGR valve while the
engine is idling. Ensure that the engine runs roughly or
s:alls.
(3) Reconnect the vacuum hoses to original location.
If no problem is found during this inspection, the system
is functioning properly. If any problem is found, check
and remedy the part concerned.
INSPECTION OF EGR VALVE
1.
Remove the EGR valve .
2. Check of EGA vafve
(1) Blow air into the EGR valve through its pipe section with
the bypass hole of the EGR valve plugged by your
fi:lger, as indicated in the right figure. Under this state,
ensure that no air continuity is present.
If air continuity exists, replace the EGR valve.
(2) Apply a negative pressure of 20.0 kPa (150 mmHg) to
the EGR valve.
Lnder this setting, blow air into the EGR valve through
its pipe section with the bypass hole of the EGR valve
plugged by your finger, as indicated in the right figure.
Ensure that air continuity exists.
If no air continuity exists, replace the EGR valve.
3. Install the EGA valve on the intake manifold with a new
gasket interposed. Connect the rubber hose.
EC-23
EMISSION CONTROL SYSTEM