2005 INFINITI FX35 Service Manual

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Page 1905 of 4731

INFINITI FX35 2005 Service Manual EC-512
[VQ35DE]
DTC P1273, P1283 A/F SENSOR 1
Revision: 2005 July 2005 FX
3. CLEAR THE SELF-LEARNING DATA.
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Sele

Page 1906 of 4731

INFINITI FX35 2005 Service Manual DTC P1273, P1283 A/F SENSOR 1 EC-513
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4. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch O

Page 1907 of 4731

INFINITI FX35 2005 Service Manual EC-514
[VQ35DE]
DTC P1273, P1283 A/F SENSOR 1
Revision: 2005 July 2005 FX
6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector

Page 1908 of 4731

INFINITI FX35 2005 Service Manual DTC P1273, P1283 A/F SENSOR 1 EC-515
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9. REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1.
CAUT

Page 1909 of 4731

INFINITI FX35 2005 Service Manual EC-516
[VQ35DE]
DTC P1274, P1284 A/F SENSOR 1
Revision: 2005 July 2005 FX
DTC P1274, P1284 A/F SENSOR 1PFP:22693
Component DescriptionABS00AAE
The air fuel ratio (A/F) sensor is a planar dual-cell lim

EC-516
[VQ35DE]
DTC P1274, P1284 A/F SENSOR 1
Revision: 2005 July 2005 FX
DTC P1274, P1284 A/F SENSOR 1PFP:22693
Component DescriptionABS00AAE
The air fuel ratio (A/F) sensor is a planar dual-cell limit current sen-
sor. The sensor element of the air fuel ratio (A/F) sensor is the com-
bination of a Nernst concentration cell (sensor cell) with an oxygen-
pump cell, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range (0.7 < < air).
The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Nernst concentration cell, where
they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at = 1. Therefore, the air fuel ratio (A/F) sen-
sor is able to indicate air/fuel ratio by this pumping of current. In
addition, a heater is integrated in the sensor to ensure the required
operating temperature of 700 - 800 °C (1,292 - 1,472 °F).
CONSULT-II Reference Value in Data Monitor ModeABS00AAF
Specification data are reference values.
On Board Diagnosis LogicABS00AAG
To judge the malfunction, the A/F signal computed by ECM from the air fuel ratio (A/F) sensor 1 signal is mon-
itored not to be shifted to LEAN side or RICH side.
DTC Confirmation ProcedureABS00AAH
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION :
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON- SULT-II.
SEF579Z
SEF580Z
MONITOR ITEM CONDITION SPECIFICATION
A/F SEN1 (B1)
A/F SEN1 (B2)
Engine: After warming up Maintaining engine speed at
2,000 rpm Fluctuates around 1.5V
DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
P1274
1274
(Bank 1) Air fuel ratio (A/F) sensor 1
rich shift monitoring
The A/F signal computed by ECM from the
air fuel ratio (A/F) sensor 1 signal is shifted
to the rich side for a specified period.
Air fuel ratio (A/F) sensor 1
Air fuel ratio (A/F) sensor 1 heater
Fuel pressure
Fuel Injector
P1284
1244
(Bank 2)

Page 1910 of 4731

INFINITI FX35 2005 Service Manual DTC P1274, P1284 A/F SENSOR 1 EC-517
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Revision: 2005 July 2005 FX
4. Clear the self-learning coefficient by touching “CLEAR”.
5. Turn ignition swit

Page 1911 of 4731

INFINITI FX35 2005 Service Manual EC-518
[VQ35DE]
DTC P1274, P1284 A/F SENSOR 1
Revision: 2005 July 2005 FX
Wiring Diagram ABS00AAI
BANK 1
TBWM0390E

Page 1912 of 4731

INFINITI FX35 2005 Service Manual DTC P1274, P1284 A/F SENSOR 1 EC-519
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Revision: 2005 July 2005 FX
Specification data are reference values and are measured between each terminal and gro

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