Infiniti G20 (P11). Manual — part 198
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The maximum voltage is over 0.6V at least one time.
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The minimum voltage is below 0.3V at least one time.
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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.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0130 HEATED OXYGEN SENSOR 1 (FRONT) (CIRCUIT)
Component Inspection (Cont’d)
EC-203
SEF463R
SEF288D
Component Description
NCEC0103
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
NCEC0104
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 (B1)
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Engine: After warming
up
Maintaining engine speed
at 2,000 rpm
0 - 0.3V
+,
Approx. 0.6 - 1.0V
HO2S1 MNTR (B1)
LEAN
+,
RICH
Changes more than 5 times during
10 seconds.
ECM Terminals and Reference Value
NCEC0105
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
62
W
Heated oxygen sensor
1 (front)
[Engine is running]
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After warming up to normal operating temperature
and engine speed is 2,000 rpm
0 - Approximately 1.0V
SEF059V
DTC P0131 HEATED OXYGEN SENSOR 1 (FRONT) (LEAN SHIFT
MONITORING)
Component Description
EC-204
SEF300U
On Board Diagnosis Logic
NCEC0106
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.
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0131
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The maximum and minimum voltages from the sensor
are not reached to the specified voltages.
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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
SEF649Y
SEF650Y
SEF651Y
DTC Confirmation Procedure
NCEC0107
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:
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Always perform at a temperature above −10°C (14°F).
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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 10 seconds.
3)
Turn ignition switch “ON” and select “HO2S1 (B1) P0131” of
“HO2S1” in “DTC WORK SUPPORT” mode with CONSULT-II.
4)
Touch “START”.
5)
Start engine and let it idle for at least 3.5 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 dis-
played on the CONSULT-II screen. Maintain the conditions
continuously until “TESTING” changes to “COMPLETED”. (It
will take approximately 50 seconds or more.)
ENG SPEED
1,900 - 3,100 rpm (A/T)
2,000 - 3,100 rpm (M/T)
Vehicle speed
Less than 120 km/h (75 MPH)
B/FUEL SCHDL
4.0 - 12.0 msec (A/T)
3.5 - 12.0 msec (M/T)
Selector lever
Suitable position
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0131 HEATED OXYGEN SENSOR 1 (FRONT) (LEAN SHIFT
MONITORING)
On Board Diagnosis Logic
EC-205
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
“Diagnostic
Procedure”, EC-206.
SEF011X
Overall Function Check
NCEC0108
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.
With GST
1)
Start engine and warm it up to normal operating temperature.
2)
Set voltmeter probes between ECM terminal 62 [Heated oxy-
gen sensor 1 (front) signal] and engine ground.
3)
Check the following with engine speed held at 2,000 rpm con-
stant 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 over 0.1V at least one time.
4)
If NG, go to “Diagnostic Procedure”, EC-206.
Diagnostic Procedure
NCEC0109
1
RETIGHTEN HEATED OXYGEN SENSOR 1 (FRONT)
1. Turn ignition switch “OFF”.
2. Loosen and retighten heated oxygen sensor 1 (front).
Tightening torque:
40 - 60 N·m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
©
GO TO 2.
DTC P0131 HEATED OXYGEN SENSOR 1 (FRONT) (LEAN SHIFT
MONITORING)
DTC Confirmation Procedure (Cont’d)
EC-206
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