Nissan Note [1101/1872] Consult ii reference value in data monitor mode

Nissan Note [1101/1872] Consult ii reference value in data monitor mode
DTC P1143 HO2S1
EC-1101
[HR (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
DTC P1143 HO2S1 PFP:22690
Component Description
BBS004FV
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 1V to 0V.
CONSULT-II Reference Value in Data Monitor Mode
BBS004FW
Specification data are reference values.
On Board Diagnosis Logic
BBS004FX
To judge the malfunction, the output from the heated oxygen sensor
1 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 malfunction will be detected.
SEF463R
SEF288D
MONITOR ITEM CONDITION SPECIFICATION
HO2S1 (B1)
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 dur-
ing 10 seconds.
SEF300U
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1143
1143
Heated oxygen sensor 1
lean shift monitoring
The maximum and minimum voltage from the
sensor are not reached to the specified voltages.
Heated oxygen sensor 1
Heated oxygen sensor 1 heater
Fuel pressure
Fuel injector
Intake air leaks

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