EC/Emission Control Systems, page 18

EC-18

EMISSION CONTROL SYSTEMS — Exhaust Gas Recirculation (EGR) System (7M-GTE)

Engine
Stopped

Air
Open

E27668

Engine at
2,500 rpm

Air
Closed

E27669

Air
E

Air Filter

Battery

F11838

Air
E
G

Battery

B18255

No continuity
Ω

F11615

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 location.

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.