DTC P1143, P1163 HO2S1
EC-1007
[VG33E]
C
D
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EC
DTC P1143, P1163 HO2S1
PFP:22690
Component Description
UBS00DMZ
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 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
UBS00DN0
Specification data are reference values.
On Board Diagnosis Logic
UBS00DN1
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)
HO2S1 (B2)
●
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.
SEF300U