Acura NSX 1997 Service Manual page 267

Main Menu
Troubleshooting
Inspection of IAB Control System.
Check for vacuum at idle:
1. Start the engine and allow it
to idle.
2. Remove the No. 3 vacuum
hose from the IAB control
diaphragm and connect a vac-
uum gauge to the hose.
Is there vacuum?
(To page 11-156)
Table of Contents
VACUUM PUMP/GAUGE, 0-30 in.Hg
A973 - 041 - XXXXX
Check for vacuum at IAB vacuum
tank:
Remove No. 3 vacuum hose from
the IAB vacuum tank, then check
for vacuum at the IAB vacuum
tank.
Is there vacuum?
Check for an open in the circuit:
1. Turn the ignition switch OFF.
2. Disconnect the 6P connector
from the control box.
3. Turn the ignition switch ON
(II).
4. Measure voltage between the
control box connector termi-
nals No. 3 and No. 6.
Is there battery voltage?
Check for an open in the wire
(IG1 line):
Measure voltage between the
control box connector terminal
No. 3 and body ground.
(To page 11-156)
IAB CONTROL
DIAPHRAGM
Repair the blockage or vacuum
leak between the IAB vacuum
tank and the intake manifold.
Replace the IAB control solenoid
valve.
(cont'd)