Nissan Frontier D22. Manual — part 476
DTC P1143, P1163 HO2S1
EC-1007
[VG33E]
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DTC P1143, P1163 HO2S1
PFP:22690
Component Description
UBS00DMZ
The heated oxygen sensor 1 is placed into the front tube. It detects
the amount of oxygen in the exhaust gas compared to the outside
air. The heated oxygen sensor 1 has a closed-end tube made of
ceramic zirconia. The zirconia generates voltage from approximately
1V in richer conditions to 0V in leaner conditions. The heated oxygen
sensor 1 signal is sent to the ECM. The ECM adjusts the injection
pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel
ratio occurs near the radical change from 1V to 0V.
CONSULT-II Reference Value in Data Monitor Mode
UBS00DN0
Specification data are reference values.
On Board Diagnosis Logic
UBS00DN1
To judge the malfunction, the output from the heated oxygen sensor
1 is monitored to determine whether the “rich” output is sufficiently
high and whether the “lean” output is sufficiently low. When both the
outputs are shifting to the lean side, the malfunction will be detected.
SEF463R
SEF288D
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 (B1)
HO2S1 (B2)
●
Engine: After warming up
Maintaining engine speed at 2,000
rpm
0 - 0.3V
←→ Approx. 0.6 - 1.0V
HO2S1 MNTR
(B1)
HO2S1 MNTR
(B2)
LEAN
←→ RICH
Changes more than 5 times during
10 seconds.
SEF300U
EC-1008
[VG33E]
DTC P1143, P1163 HO2S1
DTC Confirmation Procedure
UBS00DN2
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
●
Always perform at a temperature above
−10°C (14°F).
●
Before performing following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Stop engine and wait at least 5 seconds.
3.
Turn ignition switch ON and select “HO2S1 (B1)/(B2) P1143/
P1163” of “HO2S1” in “DTC WORK SUPPORT” mode with
CONSULT-II.
4.
Touch “START”.
5.
Start engine and let it idle for at least 3 minutes.
NOTE:
Never raise engine speed above 2,800 rpm after this step. If the engine speed limit is exceeded,
return to step 5.
6.
When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions con-
tinuously until “TESTING” changes to “COMPLETED”. (It will
take approximately 50 seconds or more.)
If “TESTING” is not displayed after 5 minutes, retry from
step 2.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1143
(Bank 1)
Heated oxygen sensor
1 lean shift monitoring
The maximum and minimum voltage from the
sensor are not reached to the specified volt-
ages.
●
Heated oxygen sensor 1
●
Heated oxygen sensor 1 heater
●
Fuel pressure
●
Fuel injector
●
Intake air leaks
P1163
(Bank 2)
LEC072A
EGN SPEED
1,200 - 3,150 rpm
Vehicle speed
Less than 100 km/h (62 MPH)
B/FUEL SCHDL
2.8 - 11.0 msec
Selector lever
Suitable position
LEC073A
DTC P1143, P1163 HO2S1
EC-1009
[VG33E]
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EC
7.
Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”. If “NG” is displayed, refer to
Overall Function Check
UBS00DN3
Use this procedure to check the overall function of the heated oxygen sensor 1 circuit. During this check, a
DTC might not be confirmed.
WITH GST
1.
Start engine and warm it up to normal operating temperature.
2.
Set voltmeter probes between ECM terminal 50 [HO2S1 (B1) signal] or 51 [HO2S1 (B2) signal] and
engine ground.
3.
Check one of the following with engine speed held at 2,000 rpm
constant under no load.
–
The maximum voltage is over 0.6V at least 1 time.
–
The minimum voltage is over 0.1V at least 1 time.
4.
If NG, go to
EC-1009, "Diagnostic Procedure"
Diagnostic Procedure
UBS00DN4
1.
RETIGHTEN GROUND SCREWS
1.
Turn ignition switch OFF.
2.
Loosen and retighten engine ground screws.
>> GO TO 2.
2.
RETIGHTEN HEATED OXYGEN SENSOR 1
Loosen and retighten corresponding heated oxygen sensor 1.
>> GO TO 3.
LEC055A
SEF919UA
BBIA0418E
Tightening torque: 40 - 60 N·m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
EC-1010
[VG33E]
DTC P1143, P1163 HO2S1
3.
CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-II.
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 or P0174 detected?
Is it difficult to start engine?
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF.
3.
Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at
idle speed.
4.
Stop engine and reconnect mass air flow sensor harness connector.
5.
Make sure DTC P0102 is displayed.
6.
Erase the DTC memory. Refer to
EC-632, "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC
.
7.
Make sure DTC P0000 is displayed.
8.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0174 detected?
Is it difficult to start engine?
Yes or No
Yes
>> Perform trouble diagnosis for DTC P0171, P0174. Refer to
.
No
>> GO TO 4.
SEF968Y
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