Infiniti G35 (V35) Sedan. Manual — part 517
EC-214
< COMPONENT DIAGNOSIS >
[VQ35HR]
P0138, P0158 HO2S2
7.
Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to
±
25%.
“HO2S2 (B1)/(B2)” should be above 0.68V at least once when the “FUEL INJECTION” is +25%.
“HO2S2 (B1)/(B2)” should be below 0.18V 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-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 and ground under the following condition.
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 and ground under the following condition.
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 and ground under the following condition.
PBIB3458E
ECM
Ground
Condition
Voltage
Connector
Terminal
F102
76
[HO2S2 (bank 1)]
Ground
Revving up to 4,000 rpm under no load at
least 10 times
The voltage should be above 0.68V at
least once during this procedure.
The voltage should be below 0.18V at least
once during this procedure.
80
[HO2S2 (bank 2)]
ECM
Ground
Condition
Voltage
Connector
Terminal
F102
76
[HO2S2 (bank 1)]
Ground
Keeping engine at idle for 10 minutes
The voltage should be above 0.68V at
least once during this procedure.
The voltage should be below 0.18V at least
once during this procedure.
80
[HO2S2 (bank 2)]
P0138, P0158 HO2S2
EC-215
< COMPONENT DIAGNOSIS >
[VQ35HR]
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 6.
6.
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 tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
>> INSPECTION END
ECM
Ground
Condition
Voltage
Connector
Terminal
F102
76
[HO2S2 (bank 1)]
Ground
Coasting from 80 km/h (50 MPH) in D po-
sition (A/T), 4th gear position (M/T)
The voltage should be above 0.68V at
least once during this procedure.
The voltage should be below 0.18V at least
once during this procedure.
80
[HO2S2 (bank 2)]
EC-216
< COMPONENT DIAGNOSIS >
[VQ35HR]
P0139, P0159 HO2S2
P0139, P0159 HO2S2
Description
INFOID:0000000000956606
The heated oxygen sensor 2, after three way catalyst 1, 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 1V in richer conditions to 0V in leaner condi-
tions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
DTC Logic
INFOID:0000000000956607
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 1 causes the longer
switching time. To judge the malfunctions of heated oxygen sensor
2, ECM monitors whether the switching response of the sensor's
voltage is faster than specified during the various driving condition
such as fuel-cut.
DTC CONFIRMATION PROCEDURE
1.
INSPECTION START
Do you have CONSULT-III?
Do you have CONSULT-III?
YES
>> GO TO 2.
NO
>> GO TO 5.
2.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30
°
C (32 to 86
°
F).
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
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 leaks
P0159
Heated oxygen sensor 2
(bank 2) circuit slow re-
sponse
P0139, P0159 HO2S2
EC-217
< COMPONENT DIAGNOSIS >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
1.
Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
2.
Start engine and warm it up to the normal operating temperature.
3.
Start engine and warm it up to the normal operating temperature.
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.
Let engine idle for 1 minute.
7.
Open engine hood.
8.
Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” of “HO2S2” in “DTC WORK SUPPORT” mode with
CONSULT-III.
9.
Start engine and following the instruction of CONSULT-III.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
10. Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT-III screen?
OK
>> INSPECTION END
NG
>> Go to
CAN NOT BE DIAGNOSED>>GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE 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
Perform component function check. Refer to
EC-217, "Component Function Check"
.
NOTE:
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:0000000000956608
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 and ground under the following condition.
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 and ground under the following condition.
DTC
ECM
Ground
Condition
Voltage
Connector
Terminal
P0139
F102
76
Ground
Revving up to 4,000 rpm under no load at
least 10 times
A change of voltage should be more than
0.24V for 1 second during this procedure.
P0159
80
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