2005 INFINITI QX4 Factory Service Manual

Page 537 of 3419

INFINITI QX4 2005  Factory Service Manual ATC-142
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
5. CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control conne

Page 538 of 3419

INFINITI QX4 2005  Factory Service Manual TROUBLE DIAGNOSIS
ATC-143
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: October 20052005 QX56
COMPONENT INSPECTION
In-vehicle Sensor
After disconnecting in-vehicle sensor connector M32, measure resis-
tance b

Page 539 of 3419

INFINITI QX4 2005  Factory Service Manual ATC-144
TROUBLE DIAGNOSIS
Revision: October 20052005 QX56
DIAGNOSTIC PROCEDURE FOR OPTICAL SENSOR
SYMPTOM: Optical sensor circuit is open or shorted. Using the
CONSULT-II, DTC B257F or B2580 is displa

Page 540 of 3419

INFINITI QX4 2005  Factory Service Manual TROUBLE DIAGNOSIS
ATC-145
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: October 20052005 QX56
Intake Sensor CircuitEJS003Y5
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & coo

Page 541 of 3419

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"

Page 542 of 3419

INFINITI QX4 2005  Factory Service Manual 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

Page 543 of 3419

INFINITI QX4 2005  Factory Service Manual 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

Page 544 of 3419

INFINITI QX4 2005  Factory Service Manual 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, "