Nissan Note — описание и диагностика датчика кислорода в системе выхлопа [203/1872]

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Nissan Note [203/1872] The heated oxygen sensor 2 after three way catalyst manifold monitors the oxygen level in the exhaust gas even if switching characteristics of the heated oxygen sensor 1 are shi...
DTC P0138 HO2S2
EC-203
[CR (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
DTC P0138 HO2S2 PFP:226A0
Component Description
BBS002WY
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas.
Even if switching characteristics of the heated oxygen sensor 1 are
shifted, the air-fuel ratio is controlled to stoichiometric, by the signal
from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1V in richer conditions to 0V in leaner condi-
tions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
CONSULT-II Reference Value in Data Monitor Mode
BBS002WZ
Specification data are reference values.
On Board Diagnosis Logic
BBS002X0
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the heated oxygen sensor 1. The oxygen
storage capacity before the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the voltage is unusually high during
the various driving condition such as fuel-cut.
SEF327R
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 (B1)
Revving engine from idle to 3,000 rpm quickly after the following condi-
tions are met.
Engine: After warming up
Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and
at idle for 1 minute under no load.
0 - 0.3V ←→ Approx. 0.6 - 1.0V
HO2S2 MNTR (B1) LEAN ←→ RICH
SEF305UA
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0138
0138
Heated oxygen sensor 2
circuit high voltage
An excessively high voltage from the sensor
is sent to ECM.
Harness or connectors
(The sensor circuit is open or shorted.)
Heated oxygen sensor 2

Содержание

9427

Узнайте о работе и диагностике второго датчика кислорода в системе выхлопа. Понимание его функций поможет в обслуживании и ремонте автомобиля.

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