EGR VACUUM MODULATOR INSPECTION
CHECK EGR VACUUM MODULATOR OPERATION
(a) Disconnect the vacuum hoses from ports P, Q and R
of the EGR vacuum modulator.
(b) Plug ports P and R with your finger.
(e) Blow air into port Q. Check that the air passes through
to the air filter side freely.
VSV INSPECTION
1. CHECK VACUUM CIRCUIT CONTINUITY IN VSV BY
BLOWING AIR INTO PIPE
(a) Connect the VSV terminals to the battery terminals as
illustrated.
(b) Blow air into a pipe E and check that air comes out of
air filter.
6. CHECK EGR VALVE
(a) Apply vacuum directly to the EGR valve with the
engine idling.
(b) Check that the engine runs rough or dies.
(c) Reconnect the vacuum hoses to the proper locations.
If no problem is found with this inspection, the system
is okay; otherwise inspect each part.
EGR VALVE INSPECTION
1. REMOVE EGR VALVE
Check the valve for sticking and heavy carbon de–
posits.
If a problem is found, replace it.
2. INSTALL EGR VALVE WITH NEW GASKET
(d) Start the engine and maintain speed at 3,500rpm.
(e) Repeat the above test. Check that there is a strong
resistance to air flow.
(f) Reconnect the vacuum hoses to the proper locations.
If a problem is found, replace the EGR vacuum mod–
ulator. ”
–ENGINE EMISSION CONTROL SYSTEMS
EG2–150
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