Air Conditioning Signal - Acura 3.5 RL Manual

Idle Control System

Air Conditioning Signal

This signals the PCM when there is a demand for cooling from the air conditioning system.
Inspection of Air Conditioning
Signal.
Check for a short in the wire
(ACS line):
1. Turn the ignition switch OFF.
2. Disconnect the radiator fan
control unit 12P connector.
3. Turn the ignition switch ON (II).
4. Measure voltage between
PCM connector terminals C2
and A26.
Is there battery voltage?
YES
Check for an open in the wire
(ACC line):
1. Turn the ignition switch OFF.
2. Reconnect the radiator fan
control unit 12P connector.
3. Turn the ignition switch ON (II).
4. Momentarily connect PCM
connector terminals A8 and
A26 with a jumper wire sever-
al times.
(To page 11-117)
Check for a short in the wire (ACS
line):
1. Turn the ignition switch OFF.
NO
2. Disconnect the PCM connec-
tor C (12P).
3. Check for continuity between
body ground and PCM con-
nector terminal C2.
Is there continuity?
NO
— Substitute a known-good PCM
and recheck (see page
for immobilizer information).
If prescribed voltage is now
available, replace the original
PCM.
— See the air conditioner inspec-
tion (see section 22).
PCM CONNECTORS
Wire side of female terminals
ACS (PNK)
Repair short in the wire between
YES
the PCM (C2) and the radiator
fan control unit.
11-42
PCM CONNECTOR A (26P)
Wire side of female
terminals