DTC P1494 EGR SOLENOID VALVE SIGNAL #2 CIRCUIT MALFUNCTION (LOW INPUT)
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DTC P1494 EGR SOLENOID VALVE SIGNAL #2
CIRCUIT MALFUNCTION (LOW INPUT)
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Detect the open/short circuit of EGR.
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Judge NG when ECM output level is different
from actual terminal level.
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(1)
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Engine
Control Module (ECM)
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(3)
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Detecting
circuit
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(5)
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Battery voltage
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(2)
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CPU
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(4)
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Switching
circuit
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(6)
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Main relay
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Secondary
Parameters
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Enable
Conditions
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Target position of EGR valve
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> 0
step
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Battery
voltage
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> 10.9
V
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Perform the diagnosis continuously when EGR
operating.
Abnormality Judgment
Judge NG when the continuous time until completing
the malfunction criteria below becomes more than time needed for
diagnosis.
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Malfunction
Criteria
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Threshold
Value
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Terminal
voltage level when ECM outputs OFF signal
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Low level
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Time Needed for Diagnosis:
2.5
seconds
Malfunction Indicator
Light Illumination:
Illuminates as soon as malfunction occurs.
Normality Judgment
Judge OK and clear the 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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Terminal
voltage level when ECM outputs ON signal
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High level
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When the OK idling cycle is completed 40 times
in a row
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When “Clear Memory” was
performed
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MALFUNCTION
INDICATOR LIGHT CLEAR CONDITION
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When the OK driving cycle was completed 3 times
in a row
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When “Clear Memory” was
performed
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Front oxygen (A/F) sensor main learning
compensation: Not allowed to calculate
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Knock sensor learning compensation:
Not allowed to calculate
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EGR control: Not allowed to operate
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ECM OPERATION
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
