Honda Acura NSX 1991 Service Manual page 296

Air Intake System
Troubleshooting Flowchart
Inspection of Chamber Volume
Control System.
Start engme and allow it to Idle.
Remove # 3 vacuum hose from
the chamber volume control
diaphragm and connect vacuum
gauge to the hose.
Is there vacuum?
(To page 11-1211
1
Disconnect the lower hose on
chamber volume control solenoid
N O
valve in the control box and con-
a vacuum gauge to the
hose.
Is there vacuum?
Y E S
Disconnect the 6P connector
from the control box.
Measure voltage between ELK/
YEL (+) terminal and BLU (-1 ter-
i n a i .
Is there battery voltage?
NO
Measure voltage between BLKI
Y E L (+) t e r m i n a l a n d b o d y
ground.
(To page'll-121)
VACUUM PUMP/
Repair the blockage or
vacuum leak between
the vacuum tank and
the Intake manifold.
Replace the chamber
volume control soleno-
id valve.