Infiniti Q45 (FY33). Manual — part 161
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The voltage never exceeds 1.0V.
CAUTION:
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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.
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Before installing new oxygen sensor, clean exhaust sys-
tem threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubri-
cant.
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TROUBLE DIAGNOSIS FOR DTC P0130 (B1), P0150 (B2)
Heated Oxygen Sensor 1 (Front) (P0130: Bank
1), (P0150: Bank 2) (Circuit) (Cont’d)
EC-173
SEF463R
Heated Oxygen Sensor 1 (Front) (P0131: Bank
1), (P0151: Bank 2) (Lean shift monitoring)
SEF288D
COMPONENT DESCRIPTION
The heated oxygen sensor 1 (front) is placed into the exhaust
manifold. It detects the amount of oxygen in the exhaust gas com-
pared to the outside air. The heated oxygen sensor 1 (front) 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 (front) 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
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 (B1)
HO2S1 (B2)
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Engine: After warming up
Maintaining engine speed at 2,000 rpm
0 - 0.3V
)
0.6 - 1.0V
HO2S1 MNTR (B1)
HO2S1 MNTR (B2)
LEAN
)
RICH
Changes more than 5 times
during 10 seconds.
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
82 (B2)
R
Heated oxygen sensor 1
(front)
Engine is running.
After warming up to normal operating tempera-
ture and engine speed is 2,000 rpm.
0 - Approximately 1.0V
(periodically change)
83 (B1)
W
TROUBLE DIAGNOSIS FOR DTC P0131 (B1), P0151 (B2)
EC-174
SEF300U
ON BOARD DIAGNOSIS LOGIC
To judge the malfunction, the output from the heated oxygen sen-
sor 1 (front) 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 malfunc-
tion will be detected.
Diagnostic Trouble
Code No.
Malfunction is detected when ...
Check Items
(Possible Cause)
P0131
0411
(Bank 1)
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The maximum voltage from the sensor is not reached to the
specified voltage.
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Heated oxygen sensor 1 (front)
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Heated oxygen sensor 1 heater (front)
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Fuel pressure
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Injectors
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Intake air leaks
P0151
0415
(Bank 2)
SEF982Z
SEF983Z
SEF651Y
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
TESTING CONDITION:
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Always perform at a temperature above −10°C (14°F).
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Before performing following procedure, confirm that bat-
tery voltage is more than 11V at idle.
1) Start engine and warm it up to normal operating tem-
perature.
2) Stop engine and wait at least 5 seconds.
3) Turn ignition switch “ON” and select “HO2S1 (B1)
P0131, (B2) P0151” of “HO2S1” in “DTC WORK SUP-
PORT” mode with CONSULT-II.
4) Touch “START”.
5) Start engine (TCS switch “OFF”) and let it idle for at
least 3 minutes.
NOTE:
Never raise engine speed above 3,200 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 displayed on the CONSULT-II screen. Maintain the
conditions continuously until “TESTING” changes to
“COMPLETED”. (It will take approximately 50 seconds.)
CMPS-RPM (POS): 1,200 - 2,200 rpm
Vehicle speed: 0 - 100 km/h (0 - 62 MPH)
B/FUEL SCHDL: 1.4 - 5.0 ms
Selector lever: Suitable position
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TROUBLE DIAGNOSIS FOR DTC P0131 (B1), P0151 (B2)
Heated Oxygen Sensor 1 (Front) (P0131: Bank
1), (P0151: Bank 2) (Lean shift monitoring)
(Cont’d)
EC-175
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 “DIAG-
NOSTIC PROCEDURE”, EC-177.
SEF353WA
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the heated oxy-
gen sensor 1 (front) circuit. During this check, a 1st trip DTC might
not be confirmed.
1) Start engine and warm it up to normal operating tem-
perature.
2) Set voltmeter probes between ECM terminal
q
83
(B2),
q
82
(B1) (sensor signal) and ground.
3) Check the following with engine speed held at 2,000
rpm constant under no load.
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The maximum voltage is over 0.6V at least one time.
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The minimum voltage is below 0.1V at least one time.
4) If NG, go to “DIAGNOSTIC PROCEDURE”, EC-177.
TROUBLE DIAGNOSIS FOR DTC P0131 (B1), P0151 (B2)
Heated Oxygen Sensor 1 (Front) (P0131: Bank
1), (P0151: Bank 2) (Lean shift monitoring)
(Cont’d)
EC-176
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