P0501

DTC P0501 Vehicle Speed Sensor Range / Performance

DESCRIPTION

The Wheel Speed Sensor (WSS) generates a waveform with a frequency according to the speed of the vehicle. The signal generated by the WSS informs the ECM not only if the vehicle speed is low or high but also is stopped the vehicle or not. The ECM uses this signal to control the fuel injection, ignition timing, transmission/transaxle shift scheduling and torque converter clutch scheduling. Also the WSS signal is used to detect rough road driving condition.

Detecting Condition & Limp Home:

DTC DETECTING CONDITION

1. DTC Description
The ECM evaluates engine speed and mass air flow if there is no vehicle speed signal. This evaluation of both value will detect open circuit or short circuit error on wheel speed sensor The ECM sets DTC P0501 if there is no vehicle speed signal from wheel speed sensor while both engine speed and mass air flow are higher than predetermined threshold during predetermined time.

If the same error code is set in the next driving cycle, the ECM illuminates the MIL.

2. Conditions for Setting the DTC

Schematic Diagram (I) WITH ABS:

Schematic Diagram (II) WITHOUT ABS:

Step 1 - 3:

Step 4:

Inspection Procedure