Toyota TERCEL 1985 Repair Manual page 113

EMISSION CONTROL SYSTEMS - Exhaust Gas Recirculation (EGR) System
/Q&V
Vacuum G a u g e ^ g ^ x /
COLD
2,000 rpm
Tachometer
HOT
2,000 rpm
Tachometer
• Q/i
^ ni.
w^--^jirSE>^ ^rf^J
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R Port y^^^
EGR Vacuum Modulator
INSPECTION OF EGR SYSTEM
1.
2.
3.
¿¿
EC0654
4.
Zero Vacumm
EC0137 EC0128
5.
Low Vacuum
Vacuum Gauge
EC0137 EC0129
Gas Filter
ECO655
CHECK AND OLEAN FILTER IN EGR VACUUM
MODULATOR
(a) Check the filters for contamination or damage.
(b) Using compressed air, clean the filters.
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
Check that the engine starts and runs at idle.
CHECK TVSV WITH COLD ENGINE
(a) The coolant temperature should be below 50°C
(122°F).
(b) Check that the vacuum gauge indicates zero at
2,000 rpm.
CHECK TVSV AND EGR VACUUM MODULATOR
WITH HOT ENGINE
(a) Warm up the engine.
(b) Check that the vacuum gauge indicates low vacuum
at 2,000 rpm.
Disconnect the vacuum hose from R port of the EGR
(c)
vacuum modulator and connect R port directly to the
intake manifold with another hose.
(d) Check that the vacuum gauge indicates high vacuum
at 2,000 rpm.
NOTE: As a large amount of EGR gas enters, the engine
will misfire slightly at this time.
(e) Disconnect the vacuum gauge and reconnect the
vacuum hoses to the proper locations.
EC-25