Infiniti Q45 (FY33). Manual — part 466
How to Perform Trouble Diagnoses for Quick
and Accurate Repair
WORK FLOW
CHECK IN
F
Reference item
LISTEN TO CUSTOMER COMPLAINT AND CON-
FIRM BY PERFORMING OPERATIONAL CHECK.
F
Operational Check (Refer to HA-30.) Symp-
tom Chart (Refer to HA-36.)
INVESTIGATE ITEMS YOU SHOULD CARRY
OUT RELATED TO EACH SYMPTOM.
F
Symptom Chart
(Refer to HA-36.)
CHECK FOR ANY SERVICE BULLETINS.
PERFORM SELF-DIAGNOSIS.
F
Self-diagnosis
(Refer to HA-37.)
E
Cannot be
performed.
I
Each component
circuit (Refer to
HA-90.)
I
Circuit Diagram
(Refer to HA-71.)
E
Can be
performed.
CHECK MAIN POWER
SUPPLY AND GROUND
CIRCUIT.
H
F
Main Power Supply and Ground Circuit
Check
(Refer to HA-86.)
MALFUNCTION CODE CAN BE FOUND.
No
Yes
ELIMINATING
GOOD PARTS/
SYSTEMS
H
F
Preliminary Check
(Refer to HA-55.)
ELIMINATE GOOD PART(S)/HARNESS(ES)/
CONNECTOR(S) ELECTRICALLY.
F
A/C Harness Layout
(Refer to HA-69.)
Malfunctioning
harness(es)/
connector(s)
Malfunctioning
part(s)
INSPECT EACH
COMPONENT.
F
Each component inspection
(Refer to HA-90.)
REPAIR.
H
REPAIR/
REPLACE.
NG
FINAL CHECK
OK
CHECK OUT
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
EL
IDX
TROUBLE DIAGNOSES
H
H
H
H
H
H
H
H
H
H
H
H
H
HA-29
Operational Check
The purpose of the operational check is to confirm that the system
operates properly.
CONDITIONS:
Engine running at normal operating temperature.
RHA147H
PROCEDURE (Without navigation system):
1. Check blower
1)
Press BLOWER switch (
: Up) one time.
MANUAL should appear on the display.
Blower should operate on low speed, and the fan symbol
should have one blade lit (
).
2)
Press BLOWER switch one more time.
3)
Continue checking blower speed and fan symbol until all four
speeds have been checked.
4)
Leave blower on high speed.
5)
Press BLOWER switch (
: Down) one time. Blower should
operate in third speed.
6)
Continue checking blower speed and fan symbol until all three
speeds have been checked.
RHA148H
2. Check discharge air
1)
Press each mode switch.
RHA167F
2)
Confirm that discharge air comes out according to the air dis-
tribution table at left.
Refer to “Discharge Air Flow”, “DESCRIPTION” (HA-27).
NOTE:
Confirm that the compressor clutch is engaged (visual inspec-
tion) and intake door position is at FRESH when the DEF
switch is pressed.
Confirm that the intake door position is at FRESH when the
F/D
switch is pressed.
TROUBLE DIAGNOSES
HA-30
RHA149H
3. Check ambient display
Press AMB switch.
Display should show the outside (ambient) temperature for
approximately 5 seconds.
RHA150H
4. Check recirculation
1)
Press RECIRCULATION switch.
Recirculation indicator should illuminate.
2)
Listen for intake door position change (you should hear blower
sound change slightly).
RHA151H
5. Check defroster
1)
Press DEFROSTER switch.
2)
Check that recirculation is canceled.
The discharge air should be coming only from the defrost
vents.
3)
Confirm that the compressor clutch is engaged (visual inspec-
tion).
The display should indicate AUTO, MANUAL, and defrost
(
).
RHA152H
6. Check ECON mode
1)
Press ECON switch once.
Defrost should be canceled.
Discharge air outlet will depend on ambient, in-vehicle, and set
temperatures.
Confirm that the compressor clutch is engaged (visual inspec-
tion).
Display should indicate ECON, AUTO (no MANUAL).
2)
Press ECON switch once more.
Display should indicate AUTO (not ECON).
Confirm that the compressor clutch is not engaged (visual
inspection).
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
EL
IDX
TROUBLE DIAGNOSES
Operational Check (Cont’d)
HA-31
RHA153H
7. Check AUTO mode
1)
Press AUTO switch.
2)
Confirm that the compressor clutch engages (audio or visual
inspection).
Display should indicate AUTO (no ECON, no MANUAL).
(Discharge air will depend on ambient, in-vehicle, and set tem-
peratures.)
RHA154H
8. Check temperature decrease and increase
1)
Turn temperature switch counterclockwise until 18°C (65°F) is
displayed.
2)
Check for cold air at discharge air outlets.
3)
Turn temperature switch clockwise until 32°C (85°F) is dis-
played.
4)
Listen for changes in blower speed as set temperature
changes.
5)
Check for hot air at discharge air outlets.
RHA155H
9. Check memory function
1)
Press OFF switch.
2)
Turn the ignition switch OFF.
3)
Wait 15 seconds.
4)
Turn the ignition switch ON.
5)
Press the AUTO switch.
6)
Confirm that the set temperature remained at 32°C (85°F).
RHA156H
10. Check rear window defogger
1)
Press rear window defogger switch.
Rear window defogger indicator should come ON.
TROUBLE DIAGNOSES
Operational Check (Cont’d)
HA-32
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