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EC-324
[QR (WITH EURO-OBD)]
DTC P1144 HO2S1
DTC P1144 HO2S1 PFP:22690
Component Description EBS010SB
The heated oxygen sensor 1 is placed into the exhaust manifold. 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 EBS010SC
Specification data are reference values.
On Board Diagnosis Logic EBS010SD
To judge the malfunction, the output from the heated oxygen sensor
1 is monitored to determine whether the “rich” output is sufficiently
high and “lean” output is sufficiently low. When both the outputs are
shifting to the rich side, the malfunction will be detected.
SEF463R
SEF288D
MONITOR ITEM CONDITION SPECIFICATION
HO2S1 (B1)
● Engine: After warming up
Maintaining engine speed at 2,000
rpm
0 - 0.3V ←→ Approx. 0.6 - 1.0V
HO2S1 MNTR (B1)
LEAN ←→ RICH
Changes more than 5 times dur-
ing 10 seconds.
SEF299U
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1144
1144
Heated oxygen sensor 1
rich shift monitoring
The maximum and minimum voltages from the
sensor are beyond the specified voltages.
● Heated oxygen sensor 1
● Heated oxygen sensor 1 heater
● Fuel pressure
● Fuel injector
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