Nissan Pathfinder (2007 year). Instruction — part 218
DTC P2A00, P2A03 A/F SENSOR 1
EC-611
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EC
2007 Pathfinder
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
UBS00KEL
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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
16
BR
A/F sensor 1 (Bank 2)
[Engine is running]
●
Warm-up condition
●
Engine speed: 2,000 rpm
Approximately 1.8V
Output voltage varies with air
fuel ratio.
24
43
G
G
A/F sensor 1 heater (Bank 2)
[Engine is running]
●
Warm-up condition
●
Idle speed
(More than 140 seconds after starting
engine)
Approximately 2.9 - 8.8V
75
P
A/F sensor 1 (Bank 2)
[Ignition switch: ON]
Approximately 2.2V
PBIA8148J
BBIA0539E
EC-612
DTC P2A00, P2A03 A/F SENSOR 1
2007 Pathfinder
2.
RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1
Loosen and retighten the air fuel ratio (A/F) sensor 1.
>> GO TO 3.
3.
CHECK FOR INTAKE AIR LEAK
1.
Start engine and run it at idle.
2.
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace.
Tightening torque: 50 N-m (5.1 kg-m, 37 ft-lb)
BBIA0557E
DTC P2A00, P2A03 A/F SENSOR 1
EC-613
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EC
2007 Pathfinder
4.
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”.
4.
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?
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 or P0174, 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-315, "DTC P0172, P0175 FUEL
No
>> GO TO 5.
SEF968Y
BBIA0541E
EC-614
DTC P2A00, P2A03 A/F SENSOR 1
2007 Pathfinder
5.
CHECK HARNESS CONNECTOR
1.
Turn ignition switch OFF.
2.
Disconnect A/F sensor 1 harness connector.
3.
Check harness connector for water.
OK or NG
OK
>> GO TO 6.
NG
>> Repair or replace harness connector.
6.
CHECK A/F SENSOR 1 POWER SUPPLY CIRCUIT
1.
Turn ignition switch ON.
2.
Check voltage between A/F sensor 1 terminal 4 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 E2, F32
●
IPDM E/R connector E119
●
15A fuse
●
Harness for open or short between A/F sensor 1 and fuse
>> Repair or replace harness or connectors.
Water should not exit.
BBIA0544E
Voltage: Battery voltage
PBIB3308E
DTC P2A00, P2A03 A/F SENSOR 1
EC-615
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EC
2007 Pathfinder
8.
CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows.
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 A/F SENSOR 1 HEATER
Refer to
EC-170, "Component Inspection"
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 11.
10.
CHECK INTERMITTENT INCIDENT
Perform
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
OK or NG
OK
>> GO TO 11.
NG
>> Repair or replace.
11.
REPLACE A/F SENSOR 1
Replace malfunctioning A/F sensor 1.
CAUTION:
●
Discard any 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 A/F sensor, clean exhaust system threads using Heated Oxygen Sensor
Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
>> GO TO 12.
A/F sensor 1 terminal
ECM terminal
Bank1
1
35
2
56
Bank 2
1
16
2
75
Continuity should exist.
Bank 1
Bank 2
A/F sensor 1 terminal
ECM terminal
A/F sensor 1 terminal
ECM terminal
1
35
1
16
2
56
2
75
Continuity should not exist.
EC-616
DTC P2A00, P2A03 A/F SENSOR 1
2007 Pathfinder
12.
CONFIRM A/F ADJUSTMENT DATA
1.
Turn ignition switch ON.
2.
Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR”
mode with CONSULT-II.
3.
Make sure that “0” is displayed on CONSULT-II screen.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 13.
13.
CREAR A/F ADJUSTMENT 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”.
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 5 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.
>> GO TO 14.
PBIB3202E
SEF968Y
BBIA0541E
DTC P2A00, P2A03 A/F SENSOR 1
EC-617
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EC
2007 Pathfinder
14.
CONFIRM A/F ADJUSTMENT DATA
1.
Turn ignition switch OFF and then ON.
2.
Select “A/F ADJ-B1” and “A/F ADJ-B2” in “DATA MONITOR”
mode with CONSULT-II.
3.
Make sure that “0” is displayed on CONSULT-II screen.
OK or NG
OK
>> INSPECTION END
Removal and Installation
UBS00KEM
AIR FUEL RATIO (A/F) SENSOR 1
Refer to
EM-22, "EXHAUST MANIFOLD AND THREE WAY CATALYST"
PBIB3202E
EC-618
ASCD BRAKE SWITCH
2007 Pathfinder
ASCD BRAKE SWITCH
PFP:25320
Component Description
UBS00KIP
When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp switch is turned ON. ECM detects the state of
the brake pedal by this input of two kinds (ON/OFF signal).
Refer to
EC-29, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)"
for the ASCD function.
CONSULT-II Reference Value in Data Monitor Mode
UBS00KIQ
Specification data are reference values.
BBIA0560E
MONITOR ITEM
CONDITION
SPECIFICATION
BRAKE SW 1
(ASCD brake switch)
●
Ignition switch: ON
Brake pedal: Fully released
ON
Brake pedal: Slightly depressed
OFF
BRAKE SW 2
(stop lamp switch)
●
Ignition switch: ON
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
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