DTC P0502 VEHICLE SPEED SENSOR CIRCUIT LOW INPUT
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DTC P0502 VEHICLE SPEED SENSOR CIRCUIT LOW
INPUT
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Detect the open or short circuit of vehicle
speed sensor.
Judge NG when low vehicle speed (0 km/h
(0 MPH)) remains whereas it seemed to be in a usual driving speed.
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Secondary
Parameters
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Enable
Conditions
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Engine
speed
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< 4,000
rpm
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Fuel
cut in decel.
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Operating
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Battery
voltage
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≥ 10.9
V
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Perform the diagnosis continuously during
fuel cut in deceleration.
Judge NG when the continuous time of completing
the malfunction criteria below becomes more than 4 seconds. 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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Vehicle
speed
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< 1
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Time Needed for Diagnosis:
4
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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Throttle position sensor signal process: All
closed points learning / Not allowed to increase.
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•
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Vehicle speed sensor signal process:
Vehicle speed = 0 km/h (0 MPH)
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•
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Fuel cut control: Vehicle speed = 0
km/h (0 MPH) / Not allowed to carry out the fuel
cut. High vehicle speed / Not allowed to carry out the
fuel cut.
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•
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ISC open loop compensation: Fix the
open loop compensation at 5%
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•
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ISC feedback control: Not allowed to
calculate the amount of ISC feedback.
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•
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Air conditioner control: Not allowed
to resume the air conditioner that is cut with the throttle fully
opened.
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•
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Radiator fan control: Both main and
sub fan are in High driving.
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ECM OPERATION
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
