Infiniti F50. Manual — part 457
DTC P1144, P1164 HO2S1
EC-469
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EC
DTC P1144, P1164 HO2S1
PFP:22690
Component Description
EBS00MIO
The heated oxygen sensor 1 is placed into the exhaust manifold. 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 1 to 0V.
CONSULT-II Reference Value in Data Monitor Mode
EBS00MIP
Specification data are reference values.
On Board Diagnosis Logic
EBS00MIQ
To judge the malfunction, the output from the heated oxygen sensor
1 is monitored to determine whether the “rich” output is sufficiently
high, “lean” output is sufficiently low. When both the outputs are shift-
ing to the rich 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)
●
Engine: After warming up
Maintaining engine speed at 2,000 rpm
LEAN
←→
RICH
Changes more than 5 times during
10 seconds.
SEF299U
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1144
1144
(Bank 1)
Heated oxygen sensor 1
rich shift monitoring
The maximum and minimum voltages from the
sensor are beyond the specified voltages.
●
Heated oxygen sensor 1
●
Heated oxygen sensor 1 heater
●
Fuel pressure
●
Injectors
P1164
1164
(Bank 2)
EC-470
DTC P1144, P1164 HO2S1
DTC Confirmation Procedure
EBS00MIR
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 10 seconds before conducting the next test.
TESTING CONDITION:
●
Always perform at a temperature above
−
10
°
C (14
°
F).
●
Before performing the 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) P1144” or “HO2S1 (B2) P1164” 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 3,600 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 40 seconds or more.)
If “TESTING” is not displayed after 5 minutes, retry from
step 2.
7.
Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”. If “NG” is displayed, refer to
.
PBIB0548E
ENG SPEED
1,100 - 2,000 rpm
Vehicle speed
Less than 100 km/h (62 MPH)
B/FUEL SCHDL
1.6 - 12.0 msec
Selector lever
Suitable position
PBIB0549E
SEC772C
DTC P1144, P1164 HO2S1
EC-471
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Overall Function Check
EBS00MIS
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 114 [HO2S1(B1) signal] 115 [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 below 0.8V at least 1 time.
–
The minimum voltage is below 0.35V at least 1 time.
4.
EC-471, "Diagnostic Procedure"
Diagnostic Procedure
EBS00MIT
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 heated oxygen sensor 1.
>> GO TO 3.
PBIB0063E
PBIB0011E
Tightening torque: 40 - 50 N·m (4.1 - 5.1 kg-m, 30 - 37 ft-lb)
PBIB0016E
EC-472
DTC P1144, P1164 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 P0172 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 con-
nector.
5.
Make sure DTC P0102 is displayed.
6.
Erase the DTC memory. Refer to
EMISSION-RELATED DIAGNOSTIC INFORMATION"
7.
Make sure DTC P0000 is displayed.
8.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0172 detected?
Is it difficult to start engine?
Yes or No
Yes
>> Perform trouble diagnosis for DTC P0172. Refer to
No
>> GO TO 4.
SEF968Y
PBIB0012E
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