INTAKE AND EXHAUST – On-vehicle Service
15-6
8. SECONDARY AIR VALVE CHECK
(1) Remove the secondary air valve.
(2) Connect a hand vacuum pump to the secondary air valve
nipple.
(3) Apply a vacuum of 67 kPa {500 mmHg} and check that
the vacuum is retained.
(4) Blow air from side (A) and side (B) of the secondary
air valve to check for air passage.
Vacuum Air blowing direction Air passage
0 kPa
(vacuum not applied)
(A) → (B) No
40 kPa {300 mmHg}
(A) → (B) Yes
or more
(B) → (A) No
9. VACUUM TANK CHECK
(1) Connect a hand vacuum pump to nipple A of the vacuum
tank. Applying a vacuum of 67 kPa {500 mmHg}, check
that the vacuum is retained.
(2) Connect a hand vacuum pump to nipple B of the vacuum
tank.
(3) Apply a vacuum of 67 kPa {500 mmHg] with nipple A
plugged with a finger. Check that the vacuum leaks when
the finger is then released.
A
B
A
B
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