Infiniti Q45. Manual — part 117
TROUBLE DIAGNOSIS
ATC-63
C
D
E
F
G
H
I
K
L
M
A
B
ATC
CHECKING INTAKE AIR (INTAKE SWITCH)
1.
Press intake switch one time.
2.
Press intake switch again. Recirculation indicator should illuminate.
3.
Listen for intake door position change. (Slight change of blower sound can be heard.)
If NG, go to trouble diagnosis procedure for
ATC-76, "Intake Door Motor Circuit"
.
If OK, continue the check.
CHECKING TEMPERATURE DECREASE
1.
Turn temperature dial (driver side) until 18
°
C (60
°
F) is displayed.
2.
Check for cold air at discharge air outlets.
If NG, go to trouble diagnosis procedure for
ATC-93, "Insufficient Cooling"
.
If OK, continue the check.
CHECKING TEMPERATURE INCREASE
1.
Turn temperature dial (driver side) until 32
°
C (90
°
F) is displayed.
2.
Check for hot air at discharge air outlets.
If NG, go to trouble diagnosis procedure for
ATC-102, "Insufficient Heating"
If OK, continue the check.
CHECK ECON (ECONOMY) MODE
1.
Set temperature dial 25
°
C (75
°
F).
2.
Press ECON switch.
3.
Display should indicate ECON (not AUTO).
4.
Press ECON switch again. Display should disappear ECON.
●
Confirm that the compressor clutch is not engaged (sound or visual inspection). (Discharge air and
blower speed will depend on ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for
ATC-106, "ECON (ECONOMY) MODE"
.
If OK, continue the check.
CHECKING AUTO MODE
1.
Press AUTO switch.
2.
Display should indicate AUTO (not ECON).
●
Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower
speed will depend on ambient, in-vehicle, and set temperatures.)
If NG, go to trouble diagnosis procedure for
ATC-64, "Power Supply and Ground Circuit for Auto Amp."
, then
if necessary, trouble diagnosis procedure for
ATC-86, "Magnet Clutch Circuit"
If all operational checks are OK (symptom cannot be duplicated), go to Incident Simulation Tests in
"How to Perform Efficient Diagnosis for an Electrical Incident"
and perform tests as outlined to simulate driv-
ing conditions environment. If symptom appears, refer to
and perform applica-
ble trouble diagnosis procedures.
ATC-64
TROUBLE DIAGNOSIS
Power Supply and Ground Circuit for Auto Amp.
NJS0008D
SYMPTOM: A/C system does not come on.
INSPECTION FLOW
COMPONENT DESCRIPTION
Auto Amp. (Automatic Amplifier)
The auto amp. has a built-in microcomputer which processes infor-
mation sent from various sensors needed for air conditioner opera-
tion. The air mix door motor, mode door motor, intake door motor,
blower motor and compressor are then controlled.
When the various switches and temperature dial are operated, data
are input to the auto amp. from the AV C/U or AV and NAVI C/U
using multiplex communication.
Self-diagnosis functions are also built into auto amp. to provide quick
check of malfunctions in the auto air conditioner system.
*1
ATC-65, "DIAGNOSIS PROCE-
DURE FOR A/C SYSTEM"
*2
*3
ATC-120, "Multiplex Communication
Circuit"
RJIA1898E
RJIA0210E
TROUBLE DIAGNOSIS
ATC-65
C
D
E
F
G
H
I
K
L
M
A
B
ATC
Potentio Temperature Control (PTC)
The PTC is built into the multifunction switch. It can be set at an
interval of 0.5
°
C (1.0
°
F) in the 18
°
C (60
°
F) to 32
°
C (90
°
F) tempera-
ture range by turning the temperature dial. The set temperature is
displayed.
DIAGNOSIS PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
1.
CHECK POWER SUPPLY CIRCUIT FOR AUTO AMP.
1.
Disconnect auto amp. connector.
2.
Check voltage between auto amp. harness connector M119 ter-
minal 7, M120 terminals 26, 27 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Check 10 A fuses [Nos. 2, 6 and 21 located in the fuse block (J/B) No. 1]. Refer to
BLOCK - JUNCTION BOX (J/B) NO. 1"
●
If fuses are OK, check harness for open circuit. Repair or replace if necessary.
●
If fuses are NG, replace fuse and check harness for short circuit. Repair or replace if necessary.
RJIA1592E
RJIA0240E
Terminals
Ignition switch position
(+)
(
−
)
OFF
ACC
ON
Auto amp.
connector
Terminal No.
M119
7
Ground
Approx. 0 V
Battery
voltage
Battery
voltage
M120
26
Battery
voltage
Battery
voltage
Battery
voltage
M120
27
Approx. 0 V
Approx. 0 V
Battery
voltage
RJIA3025E
ATC-66
TROUBLE DIAGNOSIS
2.
CHECK GROUND CIRCUIT FOR AUTO AMP.
1.
Turn ignition switch OFF.
2.
Check continuity between auto amp. harness connector M120
terminal 25 and ground.
OK or NG
OK
>> Replace auto amp.
NG
>> Repair harness or connector.
LAN System Circuit
NJS0008E
SYMPTOM: Mode door motor, intake door motor and/or air mix door motor(s) does not operate normally.
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT
1.
CHECK POWER SUPPLY FOR AUTO AMP.
1.
Turn ignition switch ON.
2.
Check voltage between auto amp. harness connector M120 ter-
minal 21 and ground.
OK or NG
OK
>> GO TO 2.
NG
>> Replace auto amp.
25 – Ground
: Continuity should exist.
RJIA3026E
RJIA0272E
21 – Ground
: Battery voltage
RJIA3027E
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