INFINITI QX4 2005 Factory Service Manual

ATC-146
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
3. CHECK INTAKE SENSOR
Refer to ATC-146, "
Intake Sensor" .
OK or NG
OK >> 1. Replace front air control. Refer to ATC-147, "FRONT AIR CONTROL"
2. Go to self-diagnosisAT C - 5 5 , "A/C System Self-diagnosis Function" and perform self-diagnosis.
NG >> 1. Replace intake sensor. Refer to ATC-151, "
INTAKE SENSOR" .
2. Go to self-diagnosisAT C - 5 5 , "
A/C System Self-diagnosis Function" and perform self-diagnosis.
4. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between intake sensor harness connector
M146 terminal 2 (L/B) and front air control harness connector
M49 terminal 9 (L/B).
4. Check continuity between intake sensor harness connector
M146 terminal 2 (L/B) and ground.
OK or NG
OK >> 1. Replace front air control. Refer to ATC-147, "FRONT AIR CONTROL" .
2. Go to self-diagnosis AT C - 5 5 , "
A/C System Self-diagnosis Function" and perform self-diagno-
sis.
NG >> Repair harness or connector.
COMPONENT INSPECTION
Intake Sensor
After disconnecting intake sensor connector, measure resistance
between terminals 1 and 2 at sensor harness side, using the table
below.
If NG, replace intake sensor.2 - 9 : Continuity should exist.
2 - Ground : Continuity should not exist.
WJIA1377E
Temperature °C (°F) Resistance kΩ
−15 (5) 209.0
−10 (14) 160.0
−5 (23) 123.0
0 (32) 95.8
5 (41) 74.9
10 (50) 58.9
15 (59) 46.7
20 (68) 37.3
25 (77) 30.0
30 (86) 24.2
35 (95) 19.7
40 (104) 16.1
45 (113) 13.2
WJIA1378E

CONTROL UNIT
ATC-147
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: October 20052005 QX56
CONTROL UNITPFP:27500
Removal and InstallationEJS003Y6
FRONT AIR CONTROL
Removal
1. Remove the five control knobs from the front air control unit.
2. Remove the cluster lid C. Refer to IP-12, "
Cluster Lid C" .
3. Remove the four screws securing the front air control unit to
cluster lid C.
4. Remove the front air control unit.
Installation
Installation is in the reverse order of removal.
REAR AIR CONTROL
Removal
1. Remove the overhead console from the headliner. Refer to EI-38, "HEADLINING" .
2. Remove the four screws and remove the rear air control.
Installation
Installation is in the reverse order of removal.
LJIA0130E
LJIA0131E

ATC-148
AMBIENT SENSOR
Revision: October 20052005 QX56
AMBIENT SENSORPFP:27722
Removal and InstallationEJS003Y7
REMOVAL
1. Disconnect the ambient sensor electrical connector.
NOTE:
The ambient sensor is located behind the front bumper, in front
of the condenser.
2. Release the ambient sensor clip and then remove the ambient
sensor.
INSTALLATION
Installation is in the reverse order of removal.
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IN-VEHICLE SENSOR
ATC-149
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: October 20052005 QX56
IN-VEHICLE SENSORPFP:27720
Removal and InstallationEJS003Y8
REMOVAL
1. Remove the cluster lid D. Refer to IP-12, "Cluster Lid D" .
2. Remove the two screws and remove the in-vehicle sensor.
INSTALLATION
Installation is in the reverse order of removal.
LJIA0132E

ATC-150
OPTICAL SENSOR
Revision: October 20052005 QX56
OPTICAL SENSORPFP:28576
Removal and InstallationEJS003Y9
The optical sensor is located in the top center of the instrument
panel. Refer to LT- 6 4 , "
Removal and Installation of Optical Sensor" .
WJIA0607E

INTAKE SENSOR
ATC-151
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: October 20052005 QX56
INTAKE SENSORPFP:27723
Removal and InstallationEJS003YA
REMOVAL
1. Remove the instrument panel. Refer to IP-10, "INSTRUMENT PANEL ASSEMBLY" .
2. Disconnect the intake sensor electrical connector.
NOTE:
The intake sensor is located on the top of the front heater and
cooling unit assembly next to the A/C evaporator cover.
3. Twist the intake sensor to remove the intake sensor from the
front heater and cooling unit assembly.
INSTALLATION
Installation is in the reverse order of removal.
LJIA0133E

ATC-152
BLOWER MOTOR
Revision: October 20052005 QX56
BLOWER MOTORPFP:27226
ComponentsEJS003YB
Front Blower Motor
Rear Blower Motor
Removal and InstallationEJS003YC
FRONT BLOWER MOTOR
Removal
1. Remove the glove box assembly. Refer to IP-14, "Instrument Lower Cover RH and Glove Box" .
2. Disconnect the front blower motor electrical connector.
3. Remove the three screws and remove the front blower motor.
Installation
Installation is in the reverse order of removal.
LJIA0136E
1. Front heater and cooling unit assembly 2. Front blower motor 3. Variable blower control
LJIA0055E
1. Rear blower motor 2. Rear blower motor case 3. Rear blower motor resistor

BLOWER MOTOR
ATC-153
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: October 20052005 QX56
REAR BLOWER MOTOR
Removal
1. Remove the rear RH interior trim panel. Refer to EI-35, "BODY SIDE TRIM" .
2. Disconnect the rear blower motor electrical connector.
3. Remove the three screws and remove the rear blower motor.
Installation
Installation is in the reverse order of removal.
LJIA0056E

ATC-154
IN-CABIN MICROFILTER
Revision: October 20052005 QX56
IN-CABIN MICROFILTERPFP:27277
Removal and InstallationEJS003YD
FUNCTION
The air inside the passenger compartment is filtered by the in-cabin
microfilters when the heater or A/C controls are set on either the
recirculation or fresh mode. The two in-cabin microfilters are located
in the front heater and cooling unit assembly. The rear heater and
cooling unit assembly only draws in air from the passenger compart-
ment to recirculate into the passenger compartment, so the rear
heater and cooling unit assembly is not equipped with in-cabin
microfilters.
REPLACEMENT TIMING
Replacement of the two in-cabin microfilters is recommended on a regular interval depending on the driving
conditions. Refer to MA-7, "
PERIODIC MAINTENANCE" . It may also be necessary to replace the two in-cabin
microfilters as part of a component replacement if the in-cabin microfilters are damaged.
REPLACEMENT PROCEDURE
1. Remove the two lower glove box hinge pins to remove the glove
box from the instrument panel and let it hang from the cord.
2. Remove the screw and remove the in-cabin microfilter cover.
3. Remove the in-cabin microfilters from the front heater and cool-
ing unit assembly housing.
4. Insert the first new in-cabin microfilter into the front heater and
cooling unit assembly housing and slide it over to the right.
Insert the second new in-cabin microfilter into the front heater
and cooling unit assembly housing.
NOTE:
The in-cabin microfilters are marked with air flow arrows. The
end of the microfilter with the arrow should face the rear of the
vehicle. The arrows should point downward.
LJIA0012E
WLIA0027E
LJIA0134E
LJIA0148E

IN-CABIN MICROFILTER
ATC-155
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: October 20052005 QX56
5. Install the in-cabin microfilter cover.
6. Install the lower glove box in the instrument panel and secure it
with the two hinge pins.
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WLIA0027E