2001 NISSAN X-TRAIL Service Repair Manual

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Page 1265 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0134 HO2S1
EC-915
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EC
On Board Diagnosis LogicEBS00MVY
Under the condition in which the heated oxygen sensor 1 signal is
not input, the EC

Page 1266 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-916
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DTC P0134 HO2S1
6. Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”. If “NG” is displayed, refer to EC-918, "
Diagnostic

Page 1267 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0134 HO2S1
EC-917
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EC
Wiring DiagramEBS00MW1
TBWA0059E

Page 1268 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-918
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DTC P0134 HO2S1
Diagnostic Procedure
EBS00MW2
1. INSPECTION START
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
>> GO TO 2.
2. CHECK HO2

Page 1269 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0134 HO2S1
EC-919
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EC
5.CHECK INTERMITTENT INCIDENT
Refer to EC-847, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END
Componen

Page 1270 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-920
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DTC P0134 HO2S1
3. Check the following with engine speed held at 2,000 rpm con-
stant under no load.
●The voltage fluctuates between 0 to 0.3V and 0.6

Page 1271 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0138 HO2S2
EC-921
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EC
DTC P0138 HO2S2PFP:226A0
Component DescriptionEBS00MW5
The heated oxygen sensor 2, after three way catalyst (manifold),

DTC P0138 HO2S2
EC-921
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EC
DTC P0138 HO2S2PFP:226A0
Component DescriptionEBS00MW5
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas.
Even if switching characteristics of the heated oxygen sensor 1 are
shifted, the air-fuel ratio is controlled to stoichiometric, by the signal
from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1V in richer conditions to 0V in leaner condi-
tions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
CONSULT-II Reference Value in Data Monitor ModeEBS00MW6
Specification data are reference values.
ECM Terminals and Reference ValueEBS00MW7
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.
On Board Diagnosis LogicEBS00MW8
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the heated oxygen sensor 1. The oxygen
storage capacity before the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the voltage is unusually high during
the various driving condition such as fuel-cut.
SEF327R
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 (B1)
●Engine: After warming upRevving engine from idle to 3,000
rpm quickly.0 - 0.3V ←→ Approx. 0.6 - 1.0V
HO2S2 MNTR (B1)
●Engine: After warming upRevving engine from idle to 3,000
rpm quickly.LEAN←→ RICH
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
95 OR/BHeated oxygen sen-
sor 2[Engine is running]
●Warm-up condition
●Engine speed is 2,000 rpm.0 - Approximately 1.0V
SEF305UA
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0138
0138Heated oxygen sensor
2 circuit high voltageAn excessively high voltage from the sensor is
sent to ECM.
●Harness or connectors
(The sensor circuit is open or shorted)
●Heated oxygen sensor 2

Page 1272 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-922
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DTC P0138 HO2S2
DTC Confirmation Procedure
EBS00MW9
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,

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