Nissan Teana J32. Manual — part 412
EC-186
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
P0138, P0158 HO2S2
Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this
check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000003856584
1.
PERFORM COMPONENT FUNCTION CHECK-I
Without CONSULT-III
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 1 minute under no load.
4.
Let engine idle for 1 minute.
5.
Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK-II
Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 3.
3.
PERFORM COMPONENT FUNCTION CHECK-III
Check the voltage between ECM harness connector terminals under the following conditions.
DTC
ECM
Condition
Voltage
Connec-
tor
+
–
Terminal
Terminal
P0138
F8
33
[HO2S2 (bank 1)
signal]
35
(Sensor
ground)
Revving up to 4,000 rpm under no
load at least 10 times
The voltage should be below 0.18 V
at least once during this procedure.
P0158
34
[HO2S2 (bank 2)
signal]
DTC
ECM
Condition
Voltage
Connec-
tor
+
–
Terminal
Terminal
P0138
F8
33
[HO2S2 (bank 1)
signal]
35
(Sensor
ground)
Keeping engine speed at idle for 10
minutes
The voltage should be below 0.18 V
at least once during this procedure.
P0158
34
[HO2S2 (bank 2)
signal]
P0138, P0158 HO2S2
EC-187
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000003856585
1.
INSPECTION START
Confirm the detected malfunction (A or B). Refer to
.
Which malfunction is detected?
A
>> GO TO 2.
B
>> GO TO 9.
2.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection E38. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace ground connection.
3.
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1.
Disconnect heated oxygen sensor 2 harness connector.
2.
Disconnect ECM harness connector.
3.
Check the continuity between heated oxygen sensor 2 (HO2S2) harness connector and ECM harness
connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check the continuity between HO2S2 harness connector and ECM harness connector.
2.
Check the continuity between HO2S2 harness connector or ECM harness connector and ground.
DTC
ECM
Condition
Voltage
Connec-
tor
+
–
Terminal
Terminal
P0138
F8
33
[HO2S2 (bank 1)
signal]
35
(Sensor
ground)
Coasting from 80 km/h (50 MPH) in D
position
The voltage should be below 0.18 V
at least once during this procedure.
P0158
34
[HO2S2 (bank 2)
signal]
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F70
1
F8
35
Existed
P0158
2
F71
1
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F70
4
F8
33
Existed
P0158
2
F71
4
34
EC-188
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
P0138, P0158 HO2S2
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK HO2S2 CONNECTOR FOR WATER
Check connectors for water.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace harness or connectors.
6.
CHECK HEATED OXYGEN SENSOR 2
EC-190, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 7.
7.
REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning 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 surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner and approved anti-seize lubricant.
>> INSPECTION END
8.
CHECK INTERMITTENT INCIDENT
GI-35, "Intermittent Incident"
>> INSPECTION END
9.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection E38. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair or replace ground connection.
10.
CLEAR MIXTURE RATIO SELF-LEARNING VALUE
1.
Clear the mixture ratio self-learning value. Refer to
EC-18, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement"
.
2.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 or P0175 detected? Is it difficult to start engine?
YES
>> Perform trouble diagnosis for DTC P0172, P0175. Refer to
NO
>> GO TO 11.
11.
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
DTC
HO2S2
ECM
Ground
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F70
4
F8
33
Ground
Not existed
P0158
2
F71
4
34
Water should not exist.
P0138, P0158 HO2S2
EC-189
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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 short to power.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
12.
CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check the continuity between HO2S2 harness connector and ECM harness connector.
2.
Check the continuity between HO2S2 harness connector or ECM harness connector and ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
13.
CHECK HEATED OXYGEN SENSOR 2
EC-190, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> GO TO 14.
14.
REPLACE HEATED OXYGEN SENSOR 2
Replace malfunctioning 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 surface such as a concrete floor; use a new one.
• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner and approved anti-seize lubricant.
>> INSPECTION END
15.
CHECK INTERMITTENT INCIDENT
GI-35, "Intermittent Incident"
.
>> INSPECTION END
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F70
1
F8
35
Existed
P0158
2
F71
1
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F70
4
F8
33
Existed
P0158
2
F71
4
34
DTC
HO2S2
ECM
Ground
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F70
4
F8
33
Ground
Not existed
P0158
2
F71
4
34
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