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SEF463R
SEF288D
Component Description
NFEC1154
The heated oxygen sensor 1 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 has a closed-end tube made of
ceramic zirconia. The zirconia generates voltage from approxi-
mately 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
NFEC1155
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.
SEF299U
On Board Diagnosis Logic
NFEC1157
To judge the malfunction, the output from the heated oxygen sen-
sor 1 is monitored to determine whether the “rich” output is suffi-
ciently high. The “lean” output is sufficiently low. When both the
outputs are shifting to the rich side, the malfunction will be
detected.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1144, P1164 HO2S1
Component Description
EC-499
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