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DTC P1147 HO2S2
EC-345
[QR (WITH EURO-OBD)]
C
D
E
F
G
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I
J
K
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M
A
EC
DTC P1147 HO2S2 PFP:226A0
Component Description BBS001GU
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 BBS001GV
Specification data are reference values.
On Board Diagnosis Logic BBS001GW
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 before the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the maximum voltage of the sensor
is sufficiently high during the various driving condition such as fuel-
cut.
SEF327R
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 (B1) Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
● 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.
0 - 0.3V ←→ Approx. 0.6 - 1.0V
HO2S2 MNTR (B1) LEAN ←→ RICH
SEF259VA
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1147
1147
Heated oxygen sensor 2
maximum voltage monitoring
The maximum voltage from the sensor is
not reached to the specified voltage.
● Harness or connectors
(The sensor circuit open or shorted.)
● Heated oxygen sensor 2
● Fuel pressure
● Fuel injector
● Intake air leaks
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