EGR SYSTEM INSPECTION
EG08Q–01
1. CHECK AND CLEAN FILTER IN EGR VACUUM
MODULATOR
(a) Check the filter for contamination or damage.
(b) Using compressed air, clean the filter.
HINT: Install the filter with the coarser surface facing the at-
mospheric side (outward).
2. PREPARATION
Using a 3–way connector, connect a vacuum gauge to the
hose between the EGR valve and vacuum pipe.
3. CHECK SEATING OF EGR VALVE
Start the engine and check that the engine starts and runs at
idle.
4. CHECK TVV WITH COLD ENGINE
(a) The engine coolant temperature should be below 35C
(95F).
(b) Check that the vacuum gauge indicates zero at 2,500 rpm.
5. CHECK TVV AND EGR VACUUM MODULATOR WITH HOT
ENGINE
(a) Warm up the engine.
(b) Check that the vacuum gauge indicates low vacuum at 2,500
rpm.
(c) Disconnect the vacuum hose from the R port of the EGR
vacuum modulator and connect the R port directly to the
intake manifold with another hose.
(d) Check that the vacuum gauge indicates high vacuum at
3,500 rpm.
HINT: As large amount of EGR gas enters, the engine will
misfire slightly.
(e) Remove the vacuum gauge and reconnect the vacuum
hoses to the proper locations.
EG–152
–ENGINE TROUBLESHOOTING EMISSION CONTROL SYSTEMS
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