Toyota TERCEL 1985 Repair Manual page 114

EC-26
EMISSION CONTROL SYSTEMS - Exhaust Gas Recirculation (EGR) System
i <Dl¡
AMrv
/wwiSzk /í
EGR V a l v e ^ ^ " " ^
EGR Vacuum
Engine Stopped
Modulator
Engine at 2,000 rpm
6.
n K j — G a s Filter
IF NO PROBLEM IS FOUND WITH THIS INSPECTION, THE
SYSTEM IS OKAY; OTHERWISE INSPECT EACH PART
EC0656
INSPECTION OF TVSV
(See page EC-22)
INSPECTION OF EGR VACUUM MODULATOR
CHECK EGR VACUUM MODULATOR OPERATION
P
EC0097
EGR Vacuum
Modulator
EC0098
INSPECTION OF EGR VALVE
1.
2.
INSPECTION OF CHECK VALVE
(See page EC-23)
CHECK EGR VALVE
(a) Apply vacuum directly to the EGR valve with the
engine idling.
(b) Check that the engine dies.
(c) Reconnect the vacuum hoses to the proper location.
(a) Disconnect the vacuum hoses from ports P, Q and R
of the EGR vacuum modulator.
(b) Plug ports Q and R with your finger.
(c) Blow air into port P. Check that the air passes
through to the air filter side freely.
(d) Start the engine and maintain engine speed at 2,000
rpm.
(e) Repeat the above test. Check that there is a strong
resistance to air flow.
(f) Disconnect the vacuum hoses to the proper loca-
tions.
REMOVE EGR VALVE
Check the valve for sticking and heavy carbón deposits. If
a problem is found, replace it.
REINSTALL EGR VALVE W I T H NEW GASKET