Nissan Maxima. Manual — part 440
EC-244
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0138, P0158 HO2S2
15.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000010094948
1.
INSPECTION START
Will CONSULT be used?
Will CONSULT be used?
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 with CONSULT.
2. Start engine and warm it up to the 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, and select “HO2S2 (B1)/(B2)” as the monitor item
with CONSULT.
7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to
±25%.
: “HO2S2 (B1)/(B2)” should be above 0.78 V at least once when the “FUEL INJECTION” is +25%.
: “HO2S2 (B1)/(B2)” 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-I
Without CONSULT
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.
JSBIA3451ZZ
JMBIA1865ZZ
P0138, P0158 HO2S2
EC-245
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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E
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G
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EC
N
P
O
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 4.
4.
CHECK HEATED OXYGEN SENSOR 2-II
Check the voltage between ECM harness connector terminals under
the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 5.
5.
CHECK HEATED OXYGEN SENSOR 2-III
Check the voltage between ECM harness connector terminals under
the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 6.
6.
REPLACE HEATED OXYGEN SENSOR 2
ECM
Condition
Voltage
Con-
nector
+
–
Terminal
Terminal
F13
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
above 0.78 V at least
once during this proce-
dure.
The voltage should be
below 0.18 V at least
once during this proce-
dure.
34
[HO2S2
(bank 2)
signal]
ECM
Condition
Voltage
Con-
nector
+
–
Terminal
Terminal
F13
33
[HO2S2
(bank 1)
signal]
35
(Sensor
ground)
Keeping engine at
idle for 10 minutes
The voltage should be
above 0.78 V at least
once during this proce-
dure.
The voltage should be
below 0.18 V at least
once during this proce-
dure.
34
[HO2S2
(bank 2)
signal]
JMBIA1866ZZ
ECM
Condition
Voltage
Con-
nector
+
–
Terminal
Terminal
F13
33
[HO2S2
(bank 1)
signal]
35
(Sensor
ground)
Coasting from 80 km/
h (50 MPH) in D posi-
tion
The voltage should be
above 0.78 V at least
once during this proce-
dure.
The voltage should be
below 0.18 V at least
once during this proce-
dure.
34
[HO2S2
(bank 2)
signal]
JMBIA1867ZZ
EC-246
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0138, P0158 HO2S2
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
P0139, P0159 HO2S2
EC-247
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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D
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EC
N
P
O
P0139, P0159 HO2S2
Description
INFOID:0000000010094949
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the air fuel ratio (A/F) sensor 1
are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-
nal from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1 V in richer conditions to 0 V in leaner con-
ditions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
DTC Logic
INFOID:0000000010094950
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 oxy-
gen storage capacity of the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the switching response of the sen-
sor's voltage is faster than specified during various driving conditions
such as fuel-cut.
DTC CONFIRMATION PROCEDURE
1.
INSPECTION START
Do you have CONSULT?
Do you have CONSULT?
YES
>> GO TO 2.
NO
>> GO TO 7.
2.
PRECONDITIONING
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.
TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30
°C (32 to 86°F).
>> GO TO 3.
SEF327R
SEF302U
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0139
Heated oxygen sensor 2
(bank 1) circuit slow re-
sponse
It takes more time for the sensor to respond be-
tween rich and lean than the specified time.
• Harness or connectors
(The sensor circuit is open or shorted.)
• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
• Intake air leakage
P0159
Heated oxygen sensor 2
(bank 2) circuit slow re-
sponse
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