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SEF327R
Component Description
NGEC0675
The heated oxygen sensor 2 (rear), after three way catalyst, moni-
tors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the heated oxygen sensor 1
(front) are shifted, the air fuel ratio is controlled to stoichiometric,
by the signal from the heated oxygen sensor 2 (rear).
This sensor is made of ceramic zirconia. The zirconia generates
voltage from approximately 1V in richer conditions to 0V in leaner
conditions.
Under normal conditions the heated oxygen sensor 2 (rear) is not
used for engine control operation.
CONSULT-II Reference Value in Data Monitor
Mode
NGEC0676
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 (B1)
HO2S2 (B2)
쐌 Engine: After warming up
Revving engine from idle up to
2,000 rpm
0 - 0.3V +, Approx. 0.6 - 1.0V
HO2S2 MNTR
(B1)
HO2S2 MNTR
(B2)
LEAN +, RICH
ECM Terminals and Reference Value
NGEC0677
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 the ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM CONDITION DATA (DC Voltage)
56 OR
Heated oxygen sensor 2
(rear) (bank 1)
[Engine is running]
쐌 Warm-up condition
쐌 Revving engine from idle up to 2,000 rpm
0 - Approximately 1.0V
57 Y
Heated oxygen sensor 2
(rear) (bank 2)
SEF305UA
On Board Diagnosis Logic
NGEC0678
The heated oxygen sensor 2 (rear) has a much longer switching
time between rich and lean than the heated oxygen sensor 1
(front). The oxygen storage capacity before the three way catalyst
causes the longer switching time. To judge the malfunctions of
heated oxygen sensor 2 (rear), ECM monitors whether the voltage
is unusually high during the various driving condition such as fuel-
cut.
Malfunction is detected when an excessively high voltage from the
sensor is sent to ECM.
DTC P0140, P0160 HEATED OXYGEN SENSOR 2 (REAR)
(BANK 1)/(BANK 2) (HIGH VOLTAGE)
VG33E
Component Description
EC-866
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