Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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14.
DTC P0500 Error of vehicle speed sensor acquisition hardware
P0501 The vehicle speed sensor signal is unreliable.
Fault Description: Vehicle speed sensor (VSS) provides vehicle speed signals to ECU. It is a kind of Hall Effect
sensor. When the rotor gear tooth of transmission output shaft passes through the magnetic field of sensor, the VSS
shall generate a signal voltage, whose frequency shall increase with the vehicle speed. The ECU shall convert the
signal voltage into vehicle speed and make use of the vehicle speed signal to determine the working status of vehicle.
If this signal is lost or abnormal, relevant DTCs shall be generated.
Diagnosis Hint: Check the harness for any damage. If the harness appears normal, observe the indication on the
digital multimeter while moving relevant connector and harness of the actuator. If the indication changes in testing,
there must be failure in that part. The intermittent failure may be caused by poor contact, abrasion of wire insulation
or breakage of the wire inside insulation. Make sure the vehicle speed sensor is correctly fixed onto the transmission
housing.
Terminal ECU
K75 VVS input signal
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