Nissan Maxima. Manual — part 439
EC-240
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0138, P0158 HO2S2
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.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000010094947
Regarding Wiring Diagram information, refer to
.
JMBIA1866ZZ
DTC
ECM
Condition
Voltage
Connec-
tor
+
–
Terminal
Terminal
P0138
F13
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]
JMBIA1867ZZ
DTC
ECM
Condition
Voltage
Connec-
tor
+
–
Terminal
Terminal
P0138
F13
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]
P0138, P0158 HO2S2
EC-241
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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 E9. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace ground connection.
3.
CHECK HO2S2 CONNECTOR FOR WATER
1. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
2. Check that water is not inside conductors.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace harness or connectors.
4.
CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check the continuity between HO2S2 harness connector and ECM harness connector.
3. Also check harness for short to ground and 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 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 and ground, or ECM harness connector and
ground.
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F62
1
F13
35
Existed
P0158
2
F56
1
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F62
4
F13
33
Existed
P0158
2
F56
4
34
DTC
HO2S2
Ground
Continuity
Bank
Connector
Terminal
P0138
1
F62
4
Ground
Not existed
P0158
2
F56
4
EC-242
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0138, P0158 HO2S2
3. Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
6.
CHECK HEATED OXYGEN SENSOR 2
EC-244, "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. Refer to
EM-31, "Removal and Installation (LH)"
33, "Removal and Installation (RH)"
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 [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).
>> INSPECTION END
8.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
>> INSPECTION END
9.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. 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-24, "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
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.
DTC
ECM
Ground
Continuity
Connector
Terminal
P0138
F13
33
Ground
Not existed
P0158
34
P0138, P0158 HO2S2
EC-243
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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 and ground, 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-244, "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. Refer to
EM-31, "Removal and Installation (LH)"
(LH) or
33, "Removal and Installation (RH)"
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 [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant
(commercial service tool).
>> INSPECTION END
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F62
1
F8
13
Existed
P0158
2
F56
1
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F62
4
F13
33
Existed
P0158
2
F56
4
34
DTC
HO2S2
Ground
Continuity
Bank
Connector
Terminal
P0138
1
F62
4
Ground
Not existed
P0158
2
F56
4
DTC
ECM
Ground
Continuity
Connector
Terminal
P0138
F13
33
Ground
Not existed
P0158
34
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