Infiniti EX35. Manual — part 616
EC-206
< COMPONENT DIAGNOSIS >
[VQ35HR]
P0138, P0158 HO2S2
P0138, P0158 HO2S2
Description
INFOID:0000000003133370
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:0000000003133371
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 oxygen storage capacity of the three way catalyst 1 causes the longer switching time.
MALFUNCTION A
To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the voltage is unusually high during the various driving con-
dition such as fuel-cut.
MALFUNCTION B
To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the minimum voltage of sensor is sufficiently low during the
various driving condition such as fuel-cut.
SEF327R
PBIB1848E
PBIB2376E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0138
Heated oxygen sensor 2
(bank 1) circuit high volt-
age
A)
An excessively high voltage from the sen-
sor is sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
B)
The minimum voltage from the sensor is
not reached to the specified voltage.
• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
P0138, P0158 HO2S2
EC-207
< COMPONENT DIAGNOSIS >
[VQ35HR]
C
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F
G
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A
EC
N
P
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DTC CONFIRMATION PROCEDURE
1.
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.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
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 2 minutes.
5.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO-1
>> With CONSULT-III: GO TO 3.
NO-2
>> Without CONSULT-III: GO TO 5.
3.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
NOTE:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30
°
C (32 to 86
°
F).
1.
Select “DATA MONITOR” mode with CONSULT-III.
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.
Check that “COOLAN TEMP/S” indicates more than 70
°
C (158
°
F).
If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches to 70
°
C (158
°
F).
7.
Open engine hood.
8.
Select “HO2S2 (B1) P1146” (for DTC P0138) or “HO2S2 (B2) P1166” (for DTC P0158) of “HO2S2” in
“DTC WORK SUPPORT” mode with CONSULT-III.
9.
Follow 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
CON NOT BE DIAGNOSED>>GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B 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 FOR MALFUNCTION B
Perform component function check. Refer to
EC-208, "Component Function Check"
.
P0158
Heated oxygen sensor 2
(bank 2) circuit high volt-
age
A)
An excessively high voltage from the sen-
sor is sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
B)
The minimum voltage from the sensor is
not reached to the specified voltage.
• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
EC-208
< COMPONENT DIAGNOSIS >
[VQ35HR]
P0138, P0158 HO2S2
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:0000000003133372
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 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 terminals under the following condition.
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 condition.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
P0138
F102
76
84
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
80
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
P0138
F102
76
84
Keeping engine at idle for 10 minutes
The voltage should be below 0.18 V at
least once during this procedure.
P0158
80
DTC
ECM
Condition
Voltage
Connector
+
–
Terminal
Terminal
P0138
F102
76
84
Coasting from 80 km/h (50 MPH) in D po-
sition
The voltage should be below 0.18 V at
least once during this procedure.
P0158
80
P0138, P0158 HO2S2
EC-209
< COMPONENT DIAGNOSIS >
[VQ35HR]
C
D
E
F
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A
EC
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Diagnosis Procedure
INFOID:0000000003133373
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 M95. 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 (HO2S2)harness connector.
2.
Disconnect ECM harness connector.
3.
Check the continuity between 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 or 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.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit or 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?
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F54
1
F102
84
Existed
P0158
2
F53
1
DTC
HO2S2
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F54
4
F102
76
Existed
P0158
2
F53
4
80
DTC
HO2S2
ECM
Ground
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0138
1
F54
4
F102
76
Ground
Not existed
P0158
2
F53
4
80
Water should not exist.
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