Page 1689 of 3066
![NISSAN X-TRAIL 2003 Electronic Repair Manual HO2S2 HEATER
EC-575
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Diagnostic ProcedureEBS00BK1
1.CHECK OVERALL FUNCTION CHECK
1. Start engine and drive the vehicle at over 70 km/h (43 MPH) for 2 c NISSAN X-TRAIL 2003 Electronic Repair Manual HO2S2 HEATER
EC-575
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Diagnostic ProcedureEBS00BK1
1.CHECK OVERALL FUNCTION CHECK
1. Start engine and drive the vehicle at over 70 km/h (43 MPH) for 2 c](/manual-img/5/57402/w960_57402-1688.png)
HO2S2 HEATER
EC-575
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Diagnostic ProcedureEBS00BK1
1.CHECK OVERALL FUNCTION CHECK
1. Start engine and drive the vehicle at over 70 km/h (43 MPH) for 2 consecutive minutes.
2. Stop vehicle and keep the engine running.
3. Set the voltmeter probe between ECM terminal 4 (HO2S2 heater signal) and ground.
4. Check the voltage under the following conditions.
OK or NG
OK >>INSPECTION END.
NG >> GO TO 2.
2.CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 2 harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between HO2S2 terminal 4 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALFUNCTIONING PART
Check the following.
lHarness connectors E60, F36
lFuse block (J/B) connector E103
l10A fuse
lHarness for open or short between heated oxygen sensor 2 and fuse
>> Repair harness or connectors.
Conditions Voltage
At idle 0 - 1V
Engine speed is above
3,800 rpmBattery voltage
PBIB0672E
PBIB0500E
Voltage: Battery voltage
PBIB0541E
Page 1690 of 3066
![NISSAN X-TRAIL 2003 Electronic Repair Manual EC-576
[QR (WITHOUT EURO-OBD)]
HO2S2 HEATER
4.CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity b NISSAN X-TRAIL 2003 Electronic Repair Manual EC-576
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HO2S2 HEATER
4.CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity b](/manual-img/5/57402/w960_57402-1689.png)
EC-576
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HO2S2 HEATER
4.CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 4 and HO2S2 terminal 1.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connectors.
5.CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer toEC-576, "
Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> Replace heated oxygen sensor 2.
6.CHECK INTERMITTENT INCIDENT
Refer toEC-453, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END
Component InspectionEBS00BK2
HEATED OXYGEN SENSOR 2 HEATER
1. Check resistance between HO2S2 terminals as follows.
2. If NG, replace heated oxygen sensor 2.
CAUTION:
Discard any heated oxygen 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.
Removal and InstallationEBS00BK3
HEATED OXYGEN SENSOR 2
Refer toEX-2, "EXHAUST SYSTEM". Continuity should exist.
Terminal No. Resistance
1 and 4 2.3 - 4.3Wat 25°C(77°F)
2 and 1, 3, 4
¥W
(Continuity should not exist)
3 and 1, 2, 4
PBIB0542E
Page 1691 of 3066
IAT SENSOR
EC-577
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IAT SENSORPFP:22630
Component DescriptionEBS00BK4
The intake air temperature sensor is built into mass air flow sensor.
The sensor detects intake air temperature and transmits a signal to
the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.
*: These data are reference values and are measured between ECM terminal 84
(Intake air temperature sensor) and body ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output
voltage. Doing so may result in damage to the ECM's transistor.
Use a ground other than ECM terminals, such as the ground.
SEC266C
Intake air
temperature°C(°F)Voltage* V Resistance kW
25 (77) 3.32 1.9 - 2.1
80 (176) 1.23 0.31 - 0.37
SEF012P
Page 1692 of 3066
EC-578
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IAT SENSOR
Wiring Diagram
EBS00BK5
TBWA0073E
Page 1693 of 3066
![NISSAN X-TRAIL 2003 Electronic Repair Manual IAT SENSOR
EC-579
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Diagnostic ProcedureEBS00BK6
1.CHECK OVERALL FUNCTION
1. Turn ignition switch "ON".
2. Check voltage between ECM terminal 84 and gro NISSAN X-TRAIL 2003 Electronic Repair Manual IAT SENSOR
EC-579
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Diagnostic ProcedureEBS00BK6
1.CHECK OVERALL FUNCTION
1. Turn ignition switch "ON".
2. Check voltage between ECM terminal 84 and gro](/manual-img/5/57402/w960_57402-1692.png)
IAT SENSOR
EC-579
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Diagnostic ProcedureEBS00BK6
1.CHECK OVERALL FUNCTION
1. Turn ignition switch "ON".
2. Check voltage between ECM terminal 84 and ground with CON-
SULT-II or tester.
OK or NG
OK >>INSPECTION END.
NG >> GO TO 2.
2.CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect mass air flow sensor (intake air temperature sensor
is built-into) harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between MAF sensor terminal 5 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connectors.
3.CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between mass air flow sensor terminal 3 and engine ground.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connectors.Voltage: 0.04 - 4.84V
PBIB0674E
PBIB0495E
Voltage: Approximately 5V
PBIB0066E
Continuity should exist.
Page 1694 of 3066
EC-580
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IAT SENSOR
4.CHECK INTAKE AIR TEMPERATURE SENSOR
Refer toEC-580, "
Component Inspection".
OK or NG
OK >> GO TO 5.
NG >> Replace mass air flow sensor (with intake air temperature sensor).
5.CHECK INTERMITTENT INCIDENT
Refer toEC-453, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END
Component InspectionEBS00BK7
INTAKE AIR TEMPERATURE SENSOR
1. Check resistance between intake air temperature sensor termi-
nals 3 and 5 under the following conditions.
2. If NG, replace mass air flow sensor (with intake air temperature
sensor).
Removal and InstallationEBS00BK8
MASS AIR FLOW SENSOR
Refer toEM-15, "AIR CLEANER AND AIR DUCT".
Intake air temperature°C(°F) Resistance kW
25 (77) 1.9 - 2.1
SEC266C
SEF012P
Page 1695 of 3066
![NISSAN X-TRAIL 2003 Electronic Repair Manual HO2S1
EC-581
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HO2S1PFP:22690
Component DescriptionEBS00B8I
The heated oxygen sensor 1 is placed into the front tube. It detects
the amount of oxygen in NISSAN X-TRAIL 2003 Electronic Repair Manual HO2S1
EC-581
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HO2S1PFP:22690
Component DescriptionEBS00B8I
The heated oxygen sensor 1 is placed into the front tube. It detects
the amount of oxygen in](/manual-img/5/57402/w960_57402-1694.png)
HO2S1
EC-581
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HO2S1PFP:22690
Component DescriptionEBS00B8I
The heated oxygen sensor 1 is placed into the front tube. It detects
the amount of oxygen in the exhaust gas compared to the outside
air. The heated oxygen sensor 1 has a closed-end tube made of
ceramic zirconia. The zirconia generates voltage from approximately
1V in richer conditions to 0V in leaner conditions. The heated oxygen
sensor 1 signal is sent to the ECM. The ECM adjusts the injection
pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel
ratio occurs near the radical change from 1V to 0V.
CONSULT-II Reference Value in Data Monitor ModeEBS00B8J
Specification data are reference values.
ECM Terminals and Reference ValueEBS00B8K
Specification data are reference values and are measured between each terminal and body 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.
SEF463R
SEF288D
MONITOR ITEM CONDITION SPECIFICATION
HO2S1 (B1)
lEngine: After warming upMaintaining engine speed at 2,000
rpm0-0.3V¨Approx. 0.6 - 1.0V
HO2S1 MNTR (B1)
lEngine: After warming upMaintaining engine speed at 2,000
rpmLEAN¨RICH
Changes more than 5 times dur-
ing10seconds.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
92 G/WHeated oxygen sen-
sor 1[Engineisrunning]
lWarm-up condition
lEngine speed is 2,000 rpm.0 - Approximately 1.0V (Periodi-
cally change)
Page 1696 of 3066
EC-582
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HO2S1
Wiring Diagram
EBS00B8L
TBWA0074E