Nissan Pathfinder (2005 year). Instruction — part 212
DTC P1279, P1289 A/F SENSOR 1
EC-547
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D
E
F
G
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K
L
M
A
EC
2005 Pathfinder
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
16
BR
A/F sensor 1 (Bank 1)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 3.1V
35
O
Approximately 2.6V
56
LG
Approximately 2.3V
75
P
Approximately 2.3V
EC-548
DTC P1279, P1289 A/F SENSOR 1
2005 Pathfinder
BANK 2
BBWA1731E
DTC P1279, P1289 A/F SENSOR 1
EC-549
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D
E
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M
A
EC
2005 Pathfinder
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure
UBS00KFE
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body. Refer to
.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1
Loosen and retighten the air fuel ratio (A/F) sensor 1.
>> GO TO 3.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
57
GR
A/F sensor 1 (Bank 2)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 2.6V
58
O
Approximately 2.3V
76
V
Approximately 3.1V
77
Y
Approximately 2.3V
BBIA0539E
Tightening torque: 50 N-m (5.1 kg-m, 37 ft-lb)
BBIA0557E
EC-550
DTC P1279, P1289 A/F SENSOR 1
2005 Pathfinder
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).
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace.
4.
CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK
>> GO TO 5.
NG
>> Repair or replace.
PBIB1216E
DTC P1279, P1289 A/F SENSOR 1
EC-551
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EC
2005 Pathfinder
5.
CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-II.
3.
Clear the self-learning control coefficient by touching “CLEAR”
or “START”.
4.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P172, P0174 or P0175 detected?
Is it difficult to start engine?
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF.
3.
Disconnect mass air flow sensor harness connector.
4.
Restart engine and let it idle for at least 3 seconds.
5.
Stop engine and reconnect mass air flow sensor harness con-
nector.
6.
Make sure DTC P0102 is displayed.
7.
Erase the DTC memory. Refer to
EMISSION-RELATED DIAGNOSTIC INFORMATION"
.
8.
Make sure DTC P0000 is displayed.
9.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
Is it difficult to start engine?
Yes or No
Yes
>> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION"
or
EC-256, "DTC P0172, P0175 FUEL
.
No
>> GO TO 6.
SEF968Y
BBIA0541E
EC-552
DTC P1279, P1289 A/F SENSOR 1
2005 Pathfinder
6.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect air fuel ratio (A/F) sensor 1 harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between air fuel ratio (A/F) sensor 1 terminal 3
and ground with CONSULT-II or tester.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E5, F14
●
IPDM E/R connector E119
●
10A fuse
●
Harness for open or short between air fuel ratio (A/F) sensor 1 and fuse
>> Repair or replace harness or connectors.
Voltage: Battery voltage
BBIA0544E
PBIB1683E
DTC P1279, P1289 A/F SENSOR 1
EC-553
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EC
2005 Pathfinder
8.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between the following terminals.
Refer to Wiring Diagram.
4.
Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.
5.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 9.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER
Refer to
EC-406, "Component Inspection"
.
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 13.
10.
CHECK MASS AIR FLOW SENSOR
Refer to
EC-189, "Component Inspection"
.
OK or NG
OK
>> GO TO 11.
NG
>> Replace mass air flow sensor.
A/F sensor 1 terminal
ECM terminal
Bank1
1
16
2
75
5
35
6
56
Bank 2
1
76
2
77
5
57
6
58
Continuity should exist.
Bank 1
Bank 2
A/F sensor 1 terminal
ECM terminal
A/F sensor 1 terminal
ECM terminal
1
16
1
76
2
75
2
77
5
35
5
57
6
56
6
58
Continuity should not exist.
EC-554
DTC P1279, P1289 A/F SENSOR 1
2005 Pathfinder
11.
CHECK PCV VALVE
Refer to
EC-45, "POSITIVE CRANKCASE VENTILATION"
.
OK or NG
OK
>> GO TO 12.
NG
>> Repair or replace PCV valve.
12.
CHECK INTERMITTENT INCIDENT
Perform
EC-158, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
OK or NG
OK
>> GO TO 13.
NG
>> Repair or replace.
13.
REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace air fuel ratio (A/F) sensor 1.
CAUTION:
●
Discard any air fuel ratio (A/F) sensor which has been dropped from a height of more than 0.5 m
(19.7 in) onto a hard surface such as a concrete floor; use a new one.
●
Before installing new air fuel ratio (A/F) sensor, clean exhaust system threads using Heated Oxy-
gen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
>> INSPECTION END
Removal and Installation
UBS00KFF
AIR FUEL RATIO (A/F) SENSOR 1
Refer to
EM-21, "EXHAUST MANIFOLD AND THREE WAY CATALYST"
.
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