Infiniti QX4 (R50). Manual — part 191
SEF463R
SEF288D
Component Description
NBEC0116
The heated oxygen sensor 1 (front) 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 (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
NBEC0117
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 (B1)
HO2S1 (B2)
I
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.
ECM Terminals and Reference Value
NBEC0656
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)
63
G
Heated oxygen sensor
1 (front) (bank 1)
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
0 - Approximately 1.0V (Peri-
odically change)
SEF059V
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(HIGH VOLTAGE)
Component Description
EC-231
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
62
G/B
Heated oxygen sensor
1 (front) (bank 2)
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
0 - Approximately 1.0V (Peri-
odically change)
SEF059V
SEF301UA
On Board Diagnosis Logic
NBEC0119
To judge the malfunction, the diagnosis checks that the heated
oxygen sensor 1 (front) output is not inordinately high.
Malfunction is detected when an excessively high voltage from the
sensor is sent to ECM.
Possible Cause
NBEC0436
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Heated oxygen sensor 1 (front)
SEF174Y
DTC Confirmation Procedure
NBEC0120
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.
WITH CONSULT-II
NBEC0120S01
1)
Start engine and warm it up to normal operating temperature.
2)
Turn ignition switch “OFF” and wait at least 10 seconds.
3)
Turn ignition switch “ON”.
4)
Select “DATA MONITOR” mode with CONSULT-II.
DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(HIGH VOLTAGE)
ECM Terminals and Reference Value (Cont’d)
EC-232
5)
Restart engine and let it idle for 25 seconds.
6)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-236.
WITH GST
NBEC0120S02
1)
Start engine and warm it up to normal operating temperature.
2)
Turn ignition switch “OFF” and wait at least 10 seconds.
3)
Restart engine and let it idle for 25 seconds.
4)
Turn ignition switch “OFF” and wait at least 10 seconds.
5)
Restart engine and let it idle for 25 seconds.
6)
Select “MODE 3” with GST.
7)
If DTC is detected, go to “Diagnostic Procedure”, EC-236.
I
When using GST, “DTC Confirmation Procedure” should
be performed twice as much as when using CONSULT-II
because GST cannot display MODE 7 (1st trip DTC) con-
cerning this diagnosis. Therefore, using CONSULT-II is
recommended.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(HIGH VOLTAGE)
DTC Confirmation Procedure (Cont’d)
EC-233
Wiring Diagram
NBEC0121
RIGHT BANK
NBEC0121S01
MEC947C
DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2)
(HIGH VOLTAGE)
Wiring Diagram
EC-234
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