Vehicle Speed Sensor(VSS) is hall sensor type and senses the rotating speed of differential gear mounted on transaxle.
Comparing engine speed with vehicle speed calculated based on vehicle speed sensor signal, ECM recognizes engaged gear. And based on the information about engaged gear, ECM performs optimum fuel injection quantity correction.
VSS signal is also used in speed meter of cluster, aircon control module, BCM, etc.
P0501 is set when 1)vehicle speed below 13.8Km/h is detected for more than 1 sec. at above 4000RPM and above 38.5 cc of fuel injection quantity or 2)above 240Kph is detected for more than 0.5 sec.
Item
Detecting Condition
Possible Cause
DTC Strategy
Signal monitoring
Vehicle speed sensor
circuit
component
Enable Conditions
During driving
Threshold Value
Vehicle speed calculated by ECM is above 240Kph for more than 0.5 sec.
When vehicle speed below 13.8Km/h is detected for more than 1.0 sec.
at above 4000RPM and above 38.5mcc of fuel injection quantity.
Diagnostic Time
Refer to threshold Value
Fail Safe
Fuel cut
NO
Clutch error monitoring inhibited
Cruise control deactivated (for Cruise control option applied vehicle)
Idle correction deactivated at low battery voltage
EGR Off
Fuel Limit
Check Lamp
Sensing Type
LOW Signal Voltage
HIGH Signal Voltage
Signal Duty
Hall sensor type
below 1.5V
above 3.5V
50±5%