DTC P1134 A/F SENSOR MICRO-COMPUTER PROBLEM
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DTC P1134 A/F SENSOR MICRO-COMPUTER
PROBLEM
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Detect the malfunction of IC communication.
Judge NG when the IC communication malfunction
occurs.
(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
gas
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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.
Abnormality Judgment
Judge NG when the malfunction criteria below
are completed.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Continuous
6 times communication error to main CPU
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≥ 2
sets
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Time Needed for Diagnosis:
Not
determined
Malfunction Indicator
Light Illumination:
Illuminates as soon as malfunction occurs.
Normality Judgment
Judge OK when the malfunction criteria below
are completed.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Normal
communication
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2 times
in a row
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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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A/F IC communication: Not allowed
to communicate.
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•
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A/F main learning compensation:
Not allowed to calculate.
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•
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Compensation at high temperature restart:
Set min. value 0.3 → usually.
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•
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Purge control: Not allowed to purge.
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ECM OPERATION
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
