DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)
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DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW
(BANK 1 SENSOR 1)
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Detect the open or short circuit of front
oxygen (A/F) sensor heater. Diagnosis is performed using
front oxygen (A/F) sensor IC, and communication is established
between front oxygen (A/F) sensor IC and main IC. Front
oxygen (A/F) sensor IC judges NG when the data of voltage
and current is abnormal with heater turned on or off.
(1)
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Protection
tube
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(2)
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Gasket
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(3)
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Sensor
housing
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(4)
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Ceramic
heater
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Secondary
Parameters
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Enable
Conditions
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None
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Always perform diagnosis continuously.
Front oxygen (A/F) sensor IC judges
NG when the continuous time of completing the malfunction criteria
below becomes more than the time needed for diagnosis (4.5 seconds).
Front oxygen (A/F) sensor IC judges OK and clear NG when
the malfunction criteria below are not completed.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Heater
circuit
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ON
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< 5
V
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< 1.5
A
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Time Needed for Diagnosis:
4.5
seconds
Malfunction Indicator
Light Illumination:
Illuminates as soon as the malfunction
occurs.
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•
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When the OK idling cycle was completed 40 times
in a row
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•
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When “Clear Memory” was
performed
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MALFUNCTION
INDICATOR LIGHT CLEAR CONDITION
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•
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When the OK driving cycle was completed 3 times
in a row
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•
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When “Clear Memory” was
performed
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•
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Front oxygen (A/F) sensor IC communication:
Not allowed to communicate
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•
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Front oxygen (A/F) sensor
main learning correction: Not allowed to calculate
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•
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Correction when re-starting at high
temperature: Normally minimum value 0.3 → 0
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Purge control: Not allowed to purge
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ECM OPERATING
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
