NISSAN X-TRAIL 2003 Electronic Repair Manual

IAT SENSOR
EC-577
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EC
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

EC-578
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IAT SENSOR
Wiring Diagram
EBS00BK5
TBWA0073E

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.

EC-580
[QR (WITHOUT EURO-OBD)]
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

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)

EC-582
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HO2S1
Wiring Diagram
EBS00B8L
TBWA0074E

HO2S1
EC-583
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Diagnostic ProcedureEBS00B8M
1.CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select "HO2S1 MNTR (B1)" in "DATA MONITOR" mode with CONSULT-II.
3. Keep the engine speed at 2,000 rpm under no load, and make
sure that the monitors fluctuate between LEAN and RICH more
than five times in 10 seconds.
Wi t h ou t C O N S U LT-I I
1. Start engine and warm it up to normal operating temperature.
2. Stop engine and wait at least 10 seconds.
3. Set ECM in "Diagnostic test mode - II (Heated oxygen sensor 1 monitor)".
Refer toEC-406, "
DIAGNOSTIC TEST MODE II—HEATED OXYGEN SENSOR 1 MONITOR".
4. Keep the engine speed at 2,000 rpm under no load, and make
sure that the MI comes ON more than five times in 10 seconds.
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
2.INSPECTION START
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
>> GO TO 3. 1time:RICH®LEAN®RICH
2 times: RICH®LEAN®RICH®LEAN®RICH
SEF820Y
SAT652J
PBIB0494E

EC-584
[QR (WITHOUT EURO-OBD)]
HO2S1
3.CHECK HO2S1 GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect HO2S1 harness connector.
2. Check harness continuity between HO2S1 terminal 3 and
ground.
Refer to Wiring Diagram.
3. Also check harness for short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to power in harness or con-
nectors.
4.CHECK HO2S1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 92 and HO2S1 terminal 2.
Refer to Wiring Diagram.
3. Check harness continuity between ECM terminal 92 or HO2S1 terminal 2 and ground.
Refer to Wiring Diagram.
4. Also check harness for short to power.
OK or NG
OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK HEATED OXYGEN SENSOR 1
Refer toEC-584, "
Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> Replace heated oxygen sensor 1.
6.CHECK INTERMITTENT INCIDENT
Refer toEC-453, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT".
>>INSPECTION END
Component InspectionEBS00B8N
HEATED OXYGEN SENSOR 1
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “MANU TRIG” and adjust “TRIGGER POINT” to 100% in “DATA MONITOR” mode with CONSULT-
II.Continuity should exist.
PBIB0500E
Continuity should exist.
Continuity should not exist.

HO2S1
EC-585
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3. Select “HO2S1 (B1)” and “HO2S1 MNTR (B1)”.
4. Hold engine speed at 2,000 rpm under no load during the follow-
ing steps.
5. Touch “RECORD” on CONSULT-II screen.
6. Check the following.
l“HO2S1 MNTR (B1)” in “DATA MONITOR” mode changes
from “RICH” to “LEAN” to “RICH” 5 times in 10 seconds.
5 times (cycles) are counted as shown at right.
l“HO2S1 (B1)” voltage goes above 0.6V at least once.
l“HO2S1 (B1)” voltage goes below 0.3V at least once.
l“HO2S1 (B1)” voltage never exceeds 1.0V.
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.
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 92 [HO2S1 (B1) signal] and engine ground.
3. Check the following with engine speed held at 2,000 rpm con-
stant under no load.
lThe voltage fluctuates between 0 to 0.3V and 0.6 to 1.0V
more than 5 times within 10 seconds.
lThe maximum voltage is over 0.6V at least one time.
lThe minimum voltage is below 0.3V at least one time.
lThe voltage never exceeds 1.0V.
1 time: 0 - 0.3V®0.6 - 1.0V®0 - 0.3V
2times:0-0.3V®0.6 - 1.0V®0-0.3V®0.6 - 1.0V
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.
SEF646Y
SEF217YA
SEF648Y
PBIB0543E

EC-586
[QR (WITHOUT EURO-OBD)]
HO2S1
Removal and Installation
EBS00B8O
HEATED OXYGEN SENSOR 1
Refer toEM-22, "EXHAUST MANIFOLD AND THREE WAY CATALYST".