Honda Acura NSX 1991 Service Manual page 914

Troubleshooting
Self-diagnosis indicator light F comes on: Indicates a problem in the air mix control motor circuit. Use a digital mul-
timeter (KS-AHM-32-003) to check it.
The
air mix control motor regulates the mixture to cold/hot air according to output from the control unit.
Problem in the air mix control mo-
Turn the ignition switch OFF.
Make sure all wires in the air mix
control motor connector are se-
curely attached. Make sure the
linkage is free of obstructions.
I
Remove the climate control unit
(page 22-84) Leave the wire con-
,
Turn the ignition switch ON.
Set the temperature control dial at
TEMP display 18, then measure
battery voltage between the No.
15 terminal and body ground
when turning temperature control
dial at TEMP display 32. After,
measure battery voltage between
the No.1 terminal and
ground when turning temperature
control dial at TEMP display 18.
Is there battery voltage?
Y E S
To page 22-27
22-26
body
Substitute a known-good control
unit and recheck.
NO
I f s y m p t o m / i n d i c a t i o n g o e s
away, replace the original control
unit.
No.1
No. 14 (BLKIGRN)
No. 11 (GRNIRED)
1