DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1)
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DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK
1 SENSOR 1)
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Detect the malfunction of front oxygen (A/F)
sensor heater.
Judge NG when impedance of front oxygen (A/F)
sensor is larger than the standard value by referring to the engine
condition such as fuel shut-off in deceleration, etc.
(1)
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Element
cover (Outer)
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(3)
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Sensor
element
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(5)
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Sensor
housing
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(2)
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Element
cover (Inner)
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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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Continuous
time which all the following conditions were filled
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30
seconds or more
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Battery
voltage
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> 10.9
V
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After fuel shut-off
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20 seconds or more
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Heater current
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In operation
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Front oxygen (A/F) sensor duty ≥ 35%
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Experienced
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Perform diagnosis continuously in 50 seconds
after starting engine.
Judge NG when the continuous time of completing
the malfunction criteria below becomes more than the time needed
for diagnosis (10 seconds). Judge OK and clear NG when the continuous
time of not completing the malfunction criteria below becomes more
than the time needed for diagnosis (10 seconds).
Judgment Value
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Malfunction
Criteria
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Threshold
Value
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Impedance
of front oxygen (A/F) sensor
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> 50 Ω
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Time Needed for Diagnosis:
10
seconds
Malfunction Indicator
Light Illumination:
Illuminates when malfunction occurs in
2 continuous driving cycles.
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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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Front oxygen (A/F) sensor main learning
correction: Not allowed to calculate
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•
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Front oxygen (A/F) sensor
sub learning correction: Do not calculate.
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•
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Correction when re-starting at high
temperature: Normally minimum value 0.06 → 0
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•
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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)
