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HO2S2 HEATER
EC-639
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Wiring DiagramEBS00KKI
YEC315A
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![NISSAN ALMERA N16 2003 Electronic Repair Manual EC-640
[QG (WITHOUT EURO-OBD)]
HO2S2 HEATER
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/out NISSAN ALMERA N16 2003 Electronic Repair Manual EC-640
[QG (WITHOUT EURO-OBD)]
HO2S2 HEATER
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/out](/manual-img/5/57350/w960_57350-969.png)
EC-640
[QG (WITHOUT EURO-OBD)]
HO2S2 HEATER
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 ProcedureEBS00KKJ
1. CHECK OVERALL FUNCTION CHECK
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch “OFF” and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least one minute under no
load.
4. Let engine idle for one minute.
5. Set the voltmeter probe between ECM terminal 2 (HO2S2 heater signal) and ground.
6. Check the voltage under the following conditions.
OK or NG
OK >>INSPECTION END.
NG >> GO TO 2.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
2R/BHeated oxygen sensor 2
heater[Engine is running]
●Engine speed: Below 3,800 rpm [after the fol-
lowing conditions are met.]
●Engine: After warming up
●Keeping the engine speed between 3,500 and
4,000 rpm for one minute and at idle for one
minute under no load.0 - 1.0V
[Ignition switch “ON”]
●Engine stopped
[Engine is running]
●Engine speed is above 3,800 rpm.BATTERY VOLTAGE
(11 - 14V)
Conditions Voltage
At idle 0 - 1V
Engine speed is above 3,600 rpm Battery voltage
PBIB0673E
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![NISSAN ALMERA N16 2003 Electronic Repair Manual HO2S2 HEATER
EC-641
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2.CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 2 harness connector.
3. T NISSAN ALMERA N16 2003 Electronic Repair Manual HO2S2 HEATER
EC-641
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2.CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 2 harness connector.
3. T](/manual-img/5/57350/w960_57350-970.png)
HO2S2 HEATER
EC-641
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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.
●Harness connectors M182, E251
●Harness connectors E75, F36
●Fuse block (J/B) connector M1
●10A fuse
●Harness for open or short between heated oxygen sensor 2 and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
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 2 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 open circuit or short to ground or short to power in harness or connectors.
MBIB0256E
Voltage: Battery voltage
PBIB0541E
Continuity should exist.
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![NISSAN ALMERA N16 2003 Electronic Repair Manual EC-642
[QG (WITHOUT EURO-OBD)]
HO2S2 HEATER
5. CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to EC-642, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace heated oxygen sensor 2.
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[QG (WITHOUT EURO-OBD)]
HO2S2 HEATER
5. CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to EC-642, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace heated oxygen sensor 2.
6. C](/manual-img/5/57350/w960_57350-971.png)
EC-642
[QG (WITHOUT EURO-OBD)]
HO2S2 HEATER
5. CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to EC-642, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Replace heated oxygen sensor 2.
6. CHECK INTERMITTENT INCIDENT
Refer to EC-485, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS00KKK
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 sur-
face such as a concrete floor; use a new one.
●Before installing new oxygen sensor, clean exhaust system
threads using Oxygen Sensor Thread Cleaner tool J-43897-
18 or J-43897-12 and approved anti-seize lubricant.
Removal and InstallationEBS00KKL
HEATED OXYGEN SENSOR 2
Refer to FE-10.
Terminal No. Resistance
1 and 4 2.3 - 4.3 Ω at 25°C (77°F)
2 and 1, 3, 4
∞Ω
(Continuity should not exist)
3 and 1, 2, 4
PBIB0542E
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IAT SENSOR
EC-643
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IAT SENSORPFP:22630
Component DescriptionEBS00KKM
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 34
(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 kΩ
25 (77) 3.32 1.9 - 2.1
80 (176) 1.23 0.31 - 0.37
SEF012P
Page 974 of 3189
EC-644
[QG (WITHOUT EURO-OBD)]
IAT SENSOR
Wiring Diagram
EBS00KKN
YEC317A
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![NISSAN ALMERA N16 2003 Electronic Repair Manual IAT SENSOR
EC-645
[QG (WITHOUT EURO-OBD)]
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Diagnostic ProcedureEBS00KKO
1.CHECK OVERALL FUNCTION
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 34 and NISSAN ALMERA N16 2003 Electronic Repair Manual IAT SENSOR
EC-645
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Diagnostic ProcedureEBS00KKO
1.CHECK OVERALL FUNCTION
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 34 and](/manual-img/5/57350/w960_57350-974.png)
IAT SENSOR
EC-645
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Diagnostic ProcedureEBS00KKO
1.CHECK OVERALL FUNCTION
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 34 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 open circuit or short to ground or short to power
in harness or connectors.
3.CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 67 and mass air flow sensor terminal 3.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors. Voltage: Approximately 0 - 4.8V
MBIB0041E
MBIB0096E
Voltage: Approximately 5V
PBIB0066E
Continuity should exist.
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EC-646
[QG (WITHOUT EURO-OBD)]
IAT SENSOR
4. CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to EC-646, "
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 to EC-485, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Component InspectionEBS00KKP
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 InstallationEBS00KKQ
MASS AIR FLOW SENSOR
Refer to EM-14, "AIR CLEANER AND AIR DUCT" .
Intake air temperature °C (°F) Resistance kΩ
25 (77) 1.9 - 2.1
SEC266C
SEF012P