Check Egr Valve; Tvv Inspection; Check Tvv By Blowing Air Into Pipe; Check Egr Vacuum Modulator Operation - Toyota 22R-E Service Manual

EG1–90
ENGINE – EMISSION CONTROL SYSTEMS

6. CHECK EGR VALVE

(a) Apply vacuum directly to the EGR valve with the
engine idling.
(b) Check that the engine runs rough or dies.
(c) Reconnect the vacuum hoses to the proper locations.
IF NO PROBLEM IS FOUND WITH THIS INSPECTION,
THE SYSTEM IS OKAY; OTHERWISE INSPECT
EACH PART

TVV INSPECTION

CHECK TVV BY BLOWING AIR INTO PIPE

(a) Drain the coolant from the radiator into a suitable
container.
(b) Remove the TVV.
(c) Cool the TVV to below 30 SC(86SF).
(d) Check that the air flows from pipe J to the air filter.
(e) Heat the TVV to above 44 SC(111 S F).
(f) Check that the air flows from pipe J to pipe K.
(g) Apply sealant to the threads of the TVV and reinstall.
Sealant: Part No. 08833–00070, THREE BOND 1324 or
equivalent
(h) Fill the radiator with coolant.
If a problem is found, replace the TVV.
EGR VACUUM MODULATOR INSPECTION

CHECK EGR VACUUM MODULATOR OPERATION

(a) Disconnect the vacuum hoses from ports, Q and R of
the EGR vacuum modulator.
(b) Plug ports P and R with your finger.
(c) Blow air into Q. Check that the air passes through to
the air filter side freely.
(d) Start the engine and maintain the speed at 3,500 rpm.
(e) Repeat the above test. Check that there is a strong
resistance to air flow.
(f) Reconnect the vacuum hoses to the proper locations.