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EC-330
[QR (WITH EURO-OBD)]
DTC P1146 HO2S2
DTC P1146 HO2S2 PFP:226A0
Component Description EBS010SJ
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas.
Even if switching characteristics of the heated oxygen sensor 1 are
shifted, the air-fuel ratio is controlled to stoichiometric, by the signal
from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1V in richer conditions to 0V in leaner condi-
tions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
CONSULT-II Reference Value in Data Monitor Mode EBS010SK
Specification data are reference values.
On Board Diagnosis Logic EBS010SL
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the heated oxygen sensor 1. The oxygen
storage capacity of the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the minimum voltage of sensor is
sufficiently low during the various driving condition such as fuel-cut.
SEF327R
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 (B1)
● Engine: After warming up
● Keeping the engine speed
between 3,500 and 4,000 rpm
for 1 minute and at idle for 1
minute under no load.
Revving engine from idle to 3,000
rpm quickly.
0 - 0.3V ←→ Approx. 0.6 - 1.0V
HO2S2 MNTR (B1) LEAN ←→ RICH
PBIB0554E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1146
1146
Heated oxygen sensor 2
minimum voltage monitoring
The minimum voltage from the sensor is not
reached to the specified voltage.
● Harness or connectors
(The sensor circuit is open or shorted.)
● Heated oxygen sensor 2
● Fuel pressure
● Fuel injector
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