Acura NSX 1991 Manual page 232

Main Menu
(From page 11-62)
Check for a short in the wires
(MIL line):
1. Turn the ignition switch OFF.
2. Disconnect the ECM connec-
tor A (26P).
3. Turn the ignition switch ON (II).
Is the MIL ON?
Substitute a known-good ECM
and recheck. If symptom/indica-
tion goes away, replace the origi-
nal ECM.
(From page 11-62)
Inspect ACG(S) (20 A) fuse in the
engine compartment fuse/relay
box.
Is the fuse OK?
Inspect IG COIL (30 A) fuse in the
engine compartment fuse/relay
box.
Is the fuse OK?
Check for a short in a sensor:
1. Turn the ignition switch ON (II).
2. Disconnect the 3P connector
of each sensor one at time:
• MAP sensor
• TP sensor
• EGR valve lift sensor
Does the MIL remain ON?
(To page 11-64)
Table of Contents
Repair short to body ground in
the wire between the ECM (A7)
and MIL.
Repair short in the wire
between ACG(S) (20 A) fuse
and PGM-FI main relay.
Replace ACG(S) (20 A) fuse.
Repair short in the wire
between IG COIL (30 A) fuse
and PGM-FI main relay.
Replace IG COIL (30 A) fuse.
Replace the sensor that caused
the light to go out.