Nissan Xterra. Manual — part 274
EC-222
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0138, P0158 HO2S2
7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to
±25%.
“HO2S2 (B1)/(B2)” should be above 0.71V 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%.
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.
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. Set voltmeter probes between ECM terminal 57 [HO2S2 (B1) signal] or 58 [HO2S2 (B2) signal] and
ground.
6. Check the voltage when revving up to 4,000 rpm under no load at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.71V at least once during this procedure.
If the voltage is above 0.71V at step 6, step 7 is not necessary.
7. Keep vehicle at idling for 10 minutes, then check voltage. Or check the voltage when coasting from 80 km/
h (50 MPH) in D position with “OD” OFF (A/T), 5th gear position (M/T).
The voltage should be below 0.18V at least once during this procedure.
8. If NG, replace 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.
JSBIA1351GB
P0139, P0159 HO2S2
EC-223
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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P0139, P0159 HO2S2
Component Description
INFOID:0000000009483933
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 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.
On Board Diagnosis Logic
INFOID:0000000009483934
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 various driving conditions such
as fuel cut.
DTC Confirmation Procedure
INFOID:0000000009483935
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
The switching time between rich and lean of a
heated oxygen sensor 2 signal delays more
than the specified time computed by ECM.
• Harness or connectors
(The sensor circuit is open or shorted)
• Heated oxygen sensor 2
• Fuel system
• EVAP system
• Intake air system
P0159
Heated oxygen sensor 2
(bank 2) circuit slow re-
sponse
EC-224
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0139, P0159 HO2S2
3.
PERFORM DTC CONFIRMATION PROCEDURE
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. Turn ignition switch ON.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
7. Let engine idle for 1 minute.
8. Make sure that “COOLAN TEMP/S” indicates more than 70
°C (158°F).
9. Drive the vehicle at a speed of 60 km/h (38 MPH) on the suitable gear position and keep the speed.
CAUTION:
Always drive vehicle at a safe speed.
10. Release the accelerator pedal fully at least 5 seconds.
CAUTION:
• Make it the condition that engine brake operates.
• Always drive vehicle safely.
• Never apply brake when releasing the accelerator pedal.
11. Repeat step 9 and 10 at least 8 times.
12. Check the following item of “DATA MONITOR”.
Is “CMPLT” displayed on CONSULT screen?
YES
>> GO TO 6.
NO-1: “CMPLT” are not displayed on DIAG 1>>Perform DTC confirmation procedure again.
NO-2: “CMPLT” are not displayed on DIAG 2>>GO TO 4.
4.
PERFORM DTC WORK SUPPORT
1. Open engine hood.
2. Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” of “HO2S2” in “DTC WORK SUPPORT” mode with
CONSULT.
3. Start engine and follow the instruction of CONSULT display.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
Is “COMPLETED” displayed on CONSULT screen?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
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.
6.
PERFORM SELF-DIAGNOSIS
With CONSULT
Perform ECM self-diagnosis.
Is DTC “P0139” or “P0159” detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
7.
PERFORM COMPONENT FUNCTION CHECK
DTC
Data monitor item
Status
P0139
HO2 S2 DIAG1 (B1)
CMPLT
HO2 S2 DIAG2 (B1)
P0159
HO2 S2 DIAG1 (B2)
HO2 S2 DIAG2 (B2)
P0139, P0159 HO2S2
EC-225
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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Perform component function check. Refer to
EC-225, "Overall 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
>> Proceed to
.
Overall Function Check
INFOID:0000000009483936
Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st
trip DTC might not be confirmed.
WITH GST
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6. Let engine idle for 1 minute.
7. Set voltmeter probes between ECM terminal 57 [HO2S2 (B1) signal] or 58 [HO2S2 (B2) signal] and
ground.
8. Check the voltage when revving up to 4,000 rpm under no load at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
A change of voltage should be more than 0.9 V for 1 second during this procedure.
If the voltage can be confirmed in step 6, step 7 is not necessary.
9. Keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80
km/h (50 MPH) in D position with “OD” OFF (A/T), 5th gear position (M/T).
A change of voltage should be more than 0.9 V for 1 second during this procedure.
10. If NG, go to
Diagnosis Procedure
INFOID:0000000009483937
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CLEAR THE SELF-LEARNING DATA
With CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.
3. Clear the self-learning control coefficient by touching “CLEAR”.
4. Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected?
BBIA0539E
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