DTC P0503 VEHICLE SPEED SENSOR INTERMITTENT/ERRATIC/HIGH
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DTC P0503 VEHICLE SPEED SENSOR INTERMITTENT/ERRATIC/HIGH
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Detect the open or short circuit of vehicle
speed sensor.
Judge NG when high vehicle speed (240 km/h
(149.1 MPH) or more) remains whereas it seemed to be in a usual
driving speed.
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ENABLE
CONDITION (USED WITH ABNORMAL JUDGEMENT)
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Secondary
Parameters
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Enable
Conditions
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Engine
speed
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< 4000
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.
Abnormality Judgment
Judge NG when the cumulative time of completing
the malfunction criteria below becomes more than 4 seconds.
Judgment
Value
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Malfunction
Criteria
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Threshold
Value
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Vehicle
speed
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≥ 240
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Time Needed for Diagnosis:
4
seconds
Malfunction Indicator
Light Illumination:
Illuminates as soon as the malfunction
occurs.
Normality Judgment
Judge OK and clear the NG when all malfunction
criteria below are completed.
Judgment
Value
|
Malfunction
Criteria
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Threshold
Value
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Vehicle
speed
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< 240
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Starter
switch
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OFF
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Time after
starter switch ON → OFF
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≥ 3
seconds
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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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Accelerator sensor signal process: Not allowed
all closed points learning.
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•
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Vehicle speed sensor signal process:
Vehicle speed = 10 km/h (6 MPH)
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•
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Fuel cut control: Not allowed vehicle
speed 0 km/h (0 MPH) fuel cut. Normally the high vehicle
speed fuel cut performs on “and” of vehicle speed
condition and engine speed, but perform the fuel cut only on engine speed
condition (4,400 rpm or more).
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•
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ISC control: Set the open loop compensation
to specified value (1 g (0.04 oz)/s). Not allowed ISC feedback volume
calculation.
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•
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Air conditioner control: Not allowed
air conditioner cut at accelerating.
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•
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Radiator fan control: ON both main/sub.
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•
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Judge gear ratio: Control as gear fixed
on 6th.
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•
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Tumble generator valve control: Open
the tumble generator valve.
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ECM OPERATION
AT DTC SETTING
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Memorize the freeze frame data. (For test
mode $02)
