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SEF463R
SEF288D
Component Description
NHEC0086
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
NHEC0087
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
MO2S1 MNTR
(B1)
MO2S1 MNTR
(B2)
LEAN +, RICH
Changes more than 5 times during
10 seconds.
SEF237U
On Board Diagnosis Logic
NHEC0089
Under the condition in which the heated oxygen sensor 1 (front)
signal is not input, the ECM circuits will read a continuous approxi-
mately 0.3V. Therefore, for this diagnosis, the time that output
voltage is within 200 to 400 mV range is monitored, and the diag-
nosis checks that this time is not inordinately long.
Malfunction is detected when the voltage from the sensor is con-
stantly approx. 0.3V.
DTC P0130 (BANK 1), P0150 (BANK 2) HO2S1 (FRONT) (CIRCUIT)
Component Description
EC-192
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