Acura NSX 1991 Manual page 237

Main Menu
Idle Control System
Air Conditioning Signal
(From page 11-117)
Is there a clicking noise from the
A/C compressor clutch?
Check for the operation of the
A/C:
1. Start the engine.
2. Turn the blower switch ON.
3. Turn the A/C switch ON.
Does the A/C operate?
Air conditioning signal is OK.
Table of Contents
Check for an open in the wire:
Momentarily connect the No. 4 ter-
minal of the 4P connector on the
A/C clutch relay to body ground
several times.
Is there a clicking noise from the
A/C compressor clutch?
Repair open in the wire between
the ECM (AS) and the A/C clutch
relay.
Check for an open in the wire:
Measure voltage between ECM
connector terminals C2 and A26.
Is voltage less than 1.0 V?
Substitute a known-good ECM
and recheck. If symptom/indi-
cation goes away, replace the
original ECM.
See the air conditioner inspec-
tion (see section 22).
A/C CLUTCH RELAY 4P CONNECTOR
WIRE SIDE OF
FEMALE TERMINALS
See air conditioner inspection (see
section 22).
ECM CONNECTORS
WIRE SIDE OF FEMALE TERMINALS
Repair open in the wire between
the ECM (C2) and the A/C switch.