DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 1)
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DTC P0134 O
2
SENSOR CIRCUIT NO
ACTIVITY DETECTED (BANK 1 SENSOR 1)
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Detect the open 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 judges
NG when the impedance of front oxygen (A/F) sensor is abnormal.
(1)
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Atmosphere
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(A)
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Electromotive
force
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(2)
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Exhaust
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(B)
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Air fuel
ratio
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(3)
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ZrO
2
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(C)
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Lean
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(4)
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Ceramic
heater
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(D)
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Rich
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Secondary
Parameters
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Enable
Conditions
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None
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Always perform the diagnosis continuously.
Front oxygen (A/F) sensor judges
NG when the continuous time until completing the malfunction criteria
below becomes more than the time needed for diagnosis (5 seconds).
Front oxygen (A/F) sensor 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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Impedance
of front oxygen (A/F) sensor
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> 500 Ω
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Time Needed for Diagnosis:
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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•
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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)
