DTC P0519 IDLE CONTROL SYSTEM MALFUNCTION (FAIL-SAFE)
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DTC P0519 IDLE CONTROL SYSTEM MALFUNCTION
(FAIL-SAFE)
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Detect the malfunction that engine speed
increases more than that in normal condition during idling.
(1)
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Engine
control module (ECM)
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(2)
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Detecting
circuit
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(3)
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Battery
voltage
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(4)
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Main relay
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(5)
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Idle air
control solenoid valve
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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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Feedback
in ISC
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In
operation
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Vehicle
speed
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< 4
km/h (2.49 MPH)
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After engine
starting
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1 seconds
or more
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Always perform diagnosis at less than 4 km/h
(2.49 MPH) of vehicle speed.
Abnormality Judgment 1
Judge NG when the continuous time until completing
the all malfunction criteria below becomes more than the time needed
for diagnosis (2 seconds).
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Engine
speed − target eng. speed
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≥ 1,000
rpm
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Feedback
value for ISC
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≤ 0
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Engine
speed change every 180 degree engine rev.
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≥ −5
rpm
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Abnormality Judgment 2
Judge NG when the continuous time until completing
the all malfunction criteria below becomes more than the time needed
for diagnosis (5 seconds).
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Engine
speed − target eng. speed
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≥ 1,000
rpm
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Feedback
value for ISC
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≤ 0
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Time Needed for Diagnosis:
2
seconds or 5 seconds
Malfunction Indicator
Light Illumination:
Illuminates as soon as malfunction occurs.
Normality Judgment
Judge OK and clear NG when the continuous
time until completing the malfunction criteria below becomes more
than the time needed for diagnosis (5 seconds).
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Engine
speed − target eng. speed
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< 200
rpm
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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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Fuel shut-off: Shut-off fuel for only #1
and #2 cylinder, or for all cylinder in accordance with
vehicle speed, engine speed, throttle position
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ECM OPERATION
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
