Toyota Supra 1990 Manual page 170

EC-18
Engine
Stopped
Engine at
2,500 rpm
No continuity
EMISSION CONTROL SYSTEMS - Exhaust Gas Recirculation (EGR) System (7M-GTE)
Open
EC2898
EC2897
e
Battery
FI1919
e
EB
Battery
F 11920
INSPECTION OF EGR VACUUM MODULATOR
CHECK EGR VACUUM MODULATOR OPERATION
(a) Disconnect the vacuum hoses from the EGR vacuum
modulator.
(b) Block port P with your finger.
(c) Blow air into the other pipe. Check that the air pass-
es through to the air filter freely.
(d) Start the engine and maintain speed at 2,500 rpm.
(e) Repeat the above test. Check that there is a strong
resistance to air flow.
If a problem is found, replace the EGR vacuum modulator.
(f)
Reconnect the vacuum hoses to the proper locations.
INSPECTION OF VSV
1. CHECK VACUUM CIRCUIT CONTINUITY IN VSV BY
BLOWING AIR INTO PIPE
(a) Connect the VSV terminals to the battery terminals
as illustrated.
(b) Blow into pipe E and check that air comes out of the
air filter.
(c) Disconnect the battery.
(d) Blow into pipe E and check that air comes out of
pipe G.
If a problem is found, replace the VSV.
2. CHECK FOR SHORT CIRCUIT
Using an ohmmeter, check that there is no continuity be-
tween the terminals and the VSV body.
If there is continuity, replace the VSV.