DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)
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DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW
(BANK 1 SENSOR 2)
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Detect open or short circuit of oxygen sensor
heater.
Oxygen sensor heater conducted the duty control,
and the output terminal voltage at ON is 0 V and the output terminal
voltage at OFF is the battery voltage.
Judge NG when the terminal voltage remains
to be Low.
(A)
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Battery
voltage
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(C)
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256 milliseconds
(cycles)
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(B)
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Oxygen sensor heater output voltage
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(D)
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Low malfunction
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Secondary
Parameters
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Enable
Conditions
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Battery
voltage
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> 10.9
V
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Elapsed
time after engine starting
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≥ 1
second
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Perform the diagnosis continuously after
engine starting.
Abnormality Judgment
Judge NG when the continuous time of completing
all the malfunction criteria below becomes more than 2560 millisecond
(10 cycles).
Judgment Value
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Malfunction
Criteria
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Threshold
Value
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Output
voltage level
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Low
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Oxygen
sensor heater control duty
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< 75%
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Time Needed for Diagnosis:
2.56
seconds
Malfunction Indicator
Light Illumination:
Illuminates when malfunction occurs in
2 continuous driving cycles.
Normality Judgment
Judge OK and clear the NG when all the malfunction
criteria below are completed.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Output
voltage level
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High
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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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Sub feedback control: Not allowed
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ECM OPERATING
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
