Nissan X-Trail 32. Instruction — part 877
P0138 HO2S2
EC-637
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
D
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1.
Disconnect ECM harness connector.
2.
Check the continuity between HO2S2 harness connector and ECM harness connector.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK HO2S2 INPUT SIGNAL CIRCUIT
1.
Check the continuity between HO2S2 harness connector and ECM harness connector.
2.
Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK HEATED OXYGEN SENSOR 2
Check the heated oxygen sensor 2. Refer to
EC-639, "Component Inspection"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-44, "Intermittent Incident"
.
NO
>> GO TO 6.
6.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to
CAUTION:
• 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
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
F31
1
F85
23
Existed
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
F31
2
F85
22
Existed
+
−
Continuity
HO2S2
Connector
Terminal
F31
2
Ground
Not existed
+
−
Continuity
ECM
Connector
Terminal
F85
22
Ground
Not existed
EC-638
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0138 HO2S2
7.
CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1.
Clear the mixture ratio self-learning value. Refer to
.
2.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 detected? Is it difficult to start engine?
YES
>> Perform trouble diagnosis for DTC P0172. Refer to
.
NO
>> GO TO 8.
8.
CHECK HO2S2 GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect heated oxygen sensor 2 harness connector.
3.
Disconnect ECM harness connector.
4.
Check the continuity between HO2S2 harness connector and ECM harness connector.
5.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair or replace error-detected parts.
9.
CHECK HO2S2 INPUT SIGNAL CIRCUIT
1.
Check the continuity between HO2S2 harness connector and ECM harness connector.
2.
Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and
ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK HEATED OXYGEN SENSOR 2
Check the heated oxygen sensor 2. Refer to
EC-639, "Component Inspection"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-44, "Intermittent Incident"
.
NO
>> GO TO 11.
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
F31
1
F85
23
Existed
+
−
Continuity
HO2S2
ECM
Connector
Terminal
Connector
Terminal
F31
2
F85
22
Existed
+
−
Continuity
HO2S2
Connector
Terminal
F31
2
Ground
Not existed
+
−
Continuity
ECM
Connector
Terminal
F85
22
Ground
Not existed
P0138 HO2S2
EC-639
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
11.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to
CAUTION:
• 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
Component Inspection
INFOID:0000000010986345
1.
INSPECTION START
Do you have CONSULT?
Do you have CONSULT?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK HEATED OXYGEN SENSOR 2
With CONSULT
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.
Select “FUEL INJECTION” in “ACTIVE TEST” mode of “ENGINE” using CONSULT, and select “HO2S2
(B1)” as the monitor item with CONSULT.
7.
Check “HO2S2 (B1)” at idle speed when adjusting “FUEL INJECTION” to
±
25%.
“HO2S2 (B1)” should be above 0.73 V at least once when the “FUEL INJECTION” is + 25%.
“HO2S2 (B1)” should be below 0.18 V at least once when the “FUEL INJECTION” is
−
25%.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 6.
3.
CHECK HEATED OXYGEN SENSOR 2-1
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.
JPBIA5998GB
EC-640
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0138 HO2S2
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 4.
4.
CHECK HEATED OXYGEN SENSOR 2-2
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 5.
5.
CHECK HEATED OXYGEN SENSOR 2-3
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 6.
6.
REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2. Refer to
CAUTION:
• 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
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.
The voltage should be below 0.18 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.
The voltage should be below 0.18 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.
The voltage should be below 0.18 V
at least once during this procedure.
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