Egr System Inspection; Check And Clean Filter In Egr Vacuum Modulator; Check Tvv With Cold Engine; Check Tvv And Egr Vacuum Modulator With Hot Engine - Toyota 3VZ–FE Troubleshooting Manual

EG–152
ENGINE TROUBLESHOOTING

EGR SYSTEM INSPECTION

1.
(a) Check the filter for contamination or damage.
(b) Using compressed air, clean the filter.
2.
3.
4.
(a) The engine coolant temperature should be below 35
C
(b) Check that the vacuum gauge indicates zero at 2,500 rpm.
5.
(a) Warm up the engine.
(b) Check that the vacuum gauge indicates low vacuum at 2,500
(c) Disconnect the vacuum hose from the R port of the EGR
(d) Check that the vacuum gauge indicates high vacuum at
(e) Remove the vacuum gauge and reconnect the vacuum
– EMISSION CONTROL SYSTEMS
CHECK AND CLEAN FILTER IN EGR VACUUM
MODULATOR
HINT: Install the filter with the coarser surface facing the at-
mospheric side (outward).
PREPARATION
Using a 3–way connector, connect a vacuum gauge to the
hose between the EGR valve and vacuum pipe.
CHECK SEATING OF EGR VALVE
Start the engine and check that the engine starts and runs at
idle.

CHECK TVV WITH COLD ENGINE

(95
F).
CHECK TVV AND EGR VACUUM MODULATOR WITH HOT
ENGINE
rpm.
vacuum modulator and connect the R port directly to the
intake manifold with another hose.
3,500 rpm.
HINT: As large amount of EGR gas enters, the engine will
misfire slightly.
hoses to the proper locations.
EG08Q–01