Infiniti I30 (A33). Manual — part 229
SEF463R
SEF288D
Component Description
NHEC0116
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
NHEC0117
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.
SEF301U
On Board Diagnosis Logic
NHEC0119
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.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0134 (BANK 1), P0154 (BANK 2) HO2S1 (FRONT) (HIGH VOLTAGE)
Component Description
EC-231
Possible Cause
NHEC0436
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Heated oxygen sensor1 (front)
SEF174Y
DTC Confirmation Procedure
NHEC0120
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
NHEC0120S01
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.
5)
Restart engine and let it idle for 25 seconds.
6)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-235.
WITH GST
NHEC0120S02
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-235.
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.
DTC P0134 (BANK 1), P0154 (BANK 2) HO2S1 (FRONT) (HIGH VOLTAGE)
Possible Cause
EC-232
Wiring Diagram
NHEC0121
BANK 1
NHEC0121S01
MEC408D
SEF854YB
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0134 (BANK 1), P0154 (BANK 2) HO2S1 (FRONT) (HIGH VOLTAGE)
Wiring Diagram
EC-233
BANK 2
NHEC0121S02
MEC409D
SEF855YB
DTC P0134 (BANK 1), P0154 (BANK 2) HO2S1 (FRONT) (HIGH VOLTAGE)
Wiring Diagram (Cont’d)
EC-234
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