Nissan X-Trail 32. Instruction — part 876
P0137 HO2S2
EC-633
< DTC/CIRCUIT DIAGNOSIS >
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• Discard any 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 sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).
>> INSPECTION END
EC-634
< DTC/CIRCUIT DIAGNOSIS >
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P0138 HO2S2
P0138 HO2S2
DTC Description
INFOID:0000000010986343
DTC DETECTION LOGIC
The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/
F) sensor 1. The oxygen storage capacity of the three way catalyst (manifold) causes the longer switching
time.
MALFUNCTION A
To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the voltage is unusually high during the various driving con-
dition such as fuel-cut.
MALFUNCTION B
To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the minimum voltage of sensor is sufficiently low during the
various driving condition such as fuel-cut.
POSSIBLE CAUSE
DTC P0138 - A
• Harness or connectors (The sensor circuit is open or shorted.)
• Heated oxygen sensor 2
DTC P0138 - B
• Harness or connectors (The sensor circuit is open or shorted.)
• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
PBIB1848E
PBIB2376E
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P0138
HO2S2 (B1)
(O2 sensor circuit high voltage bank 1 sen-
sor 2)
A
An excessively high voltage from the sensor is sent to ECM.
B
The minimum voltage from the sensor is not reached to the specified
voltage.
P0138 HO2S2
EC-635
< DTC/CIRCUIT DIAGNOSIS >
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If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
1.
Start engine and warm it up to 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 1 minute under no load.
4.
Let engine idle for 2 minutes.
5.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO-1
>> With CONSULT: GO TO 3.
NO-2
>> Without CONSULT: GO TO 5.
3.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
NOTE:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30
°
C (32 to 86
°
F).
1.
Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT.
2.
Start engine and warm it up to normal operating temperature.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5.
Let engine idle for 1 minute.
6.
Make sure that “COOLAN TEMP/S” indication is more than 70
°
C (158
°
F).
If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches 70
°
C (158
°
F).
7.
Open engine hood.
8.
Select “HO2S2 (B1) P1146” of “HO2S2” in “DTC WORK SUPPORT” mode of “ENGINE” using CONSULT.
9.
Follow the instruction of CONSULT.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
10. Touch “SELF-DIAG RESULT”.
Which is displayed on CONSULT
OK
>> INSPECTION END
NG
>> Proceed to
.
CAN NOT BE DIAGNOSED>>GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B AGAIN
1.
Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
2.
Perform DTC confirmation procedure again.
>> GO TO 3.
5.
PERFORM COMPONENT FUNCTION CHECK-1
Without CONSULT
1.
Start engine and warm it up to 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 1 minute under no load.
4.
Let engine idle for 1 minute.
5.
Check the voltage between ECM harness connector and ground as per the following condition.
EC-636
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0138 HO2S2
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 6.
6.
PERFORM COMPONENT FUNCTION CHECK-2
Check the voltage between ECM harness connector and ground as per the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 7.
7.
PERFORM COMPONENT FUNCTION CHECK-3
Check the voltage between ECM harness connector and ground as per the following condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000010986344
1.
INSPECTION START
Confirm the detected malfunction (A or B). Refer to
.
Which malfunction is detected?
A
>> GO TO 2.
B
>> GO TO 7.
2.
CHECK HO2S2 CONNECTOR FOR WATER
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 2 harness connector.
3.
Check connectors for water.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
CHECK HO2S2 GROUND CIRCUIT
ECM
Condition
Voltage
Connector
+
−
Terminal
F85
22
23
Revving up to 4,000 rpm under no
load at least 10 times
The voltage should be above 0.73 V
at least once during this procedure.
ECM
Condition
Voltage
Connector
+
−
Terminal
F85
22
23
Keeping engine speed at idle for 10
minutes
The voltage should be above 0.73 V
at least once during this procedure.
ECM
Condition
Voltage
Connector
+
−
Terminal
F85
22
23
Coasting from 80 km/h (50 MPH) in
D position
The voltage should be above 0.73 V
at least once during this procedure.
Water should not exist.
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