2005 INFINITI QX4 Factory Service Manual

Page 1713 of 3419

INFINITI QX4 2005  Factory Service Manual EC-522Revision: October 2005
DTC P1279, P1289 A/F SENSOR 1
2005 QX56
Wiring DiagramUBS00HAQ
BANK 1
BBWA1700E

Page 1714 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P1279, P1289 A/F SENSOR 1
EC-523
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: October 20052005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do no

Page 1715 of 3419

INFINITI QX4 2005  Factory Service Manual EC-524Revision: October 2005
DTC P1279, P1289 A/F SENSOR 1
2005 QX56
BANK 2
BBWA1701E

Page 1716 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P1279, P1289 A/F SENSOR 1
EC-525
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: October 20052005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do no

Page 1717 of 3419

INFINITI QX4 2005  Factory Service Manual EC-526Revision: October 2005
DTC P1279, P1289 A/F SENSOR 1
2005 QX56
3. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before three way catalyst (Manifold

Page 1718 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P1279, P1289 A/F SENSOR 1
EC-527
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: October 20052005 QX56
5. CLEAR THE SELF-LEARNING DATA
 With CONSULT-II
1. Start engine and warm it up to normal operating tempe

Page 1719 of 3419

INFINITI QX4 2005  Factory Service Manual EC-528Revision: October 2005
DTC P1279, P1289 A/F SENSOR 1
2005 QX56
6. CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Turn ignit

Page 1720 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P1279, P1289 A/F SENSOR 1
EC-529
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: October 20052005 QX56
8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect