Toyota TERCEL 1985 Repair Manual page 110

EC-22 EMISSION CONTROL SYSTEMS - Exhaust Gas Recirculation (EGR) System
Below 7°C
F»>
17 - 50°C
Above 68°C
INSPECTION OF TVSV
CHECK TVSV BY BLOWING AIR INTO PIPES
(a) Drain the coolant from the radiator into a suitable
container.
(b) Remove the TVSV.
(c) Cool the TVSV to below 7°C (45°F).
(d) Check that air flows from pipe J to pipe M and L, and
flows from pipe K to pipe N.
ECÓ111
(e) Heat the TVSV to 17 - 50°C (63 - 122°F).
(f) Check that air flows from pipe K to pipe N and L, and
flows from pipe J to pipe M.
EC0112
(g) Heat the TVSV to above 68°C (154°F).
(h) Check that air flows from pipe K to pipe M and L, and
does not flow from pipe J to the other pipes.
(i) Apply liquid sealer to the threads of the TVSV and
reinstall.
(j) Fill the radiator with coolant.
If a problem is found, replace the TVSV.
EC0113
INSPECTION OF EGR VACUUM MODULATOR
CHECK EGR VACUUM MODULATOR OPERATION
(a) Disconnect two vacuum hoses from the EGR vacuum
modulator.
(b) Plug the pipe with your finger.
(c) Blow air into another pipe and check that the air
passes through to the air filter side freely.
(d) Start the engine and maintain engine speed at 3,000
rpm.
(e) Repeat the above test and check that there is a
strong resistance to air flow.
(f) Reconnect the vacuum hoses to the proper locations.