P0500

DTC P0500 Vehicle Speed Sensor (VSS) Circuit

Refer to Engine Control Schematics VSS .

Circuit Description

The vehicle speed sensor (VSS) circuit is of the magnetic induction type. The gear teeth are pressed on the outside diameter of the output shaft assembly. The gear teeth induce an alternating current in the sensor as the shaft rotates. The signal goes to the Speedo Adapter Module then directly to the PCM. This pulsing action takes place about 40 times per revolution of output shaft of transmission. The PCM calculates the vehicle speed based on the time between pulses.

Conditions for Running the DTC

* No MAP DTCs
* The vehicle speed is 0 mph.
* The engine coolant temperature is above 60°C (140°F).
* The engine speed is at least 1400 but no more than 4400 RPM.
* The MAP is below 20 kPa.
* The TP is less than 3.125 percent.

Conditions for Setting the DTC

PCM detects vehicle speed at 0 mph for 110 seconds or more.

Action Taken When the DTC Sets

* The PCM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
* The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Freeze Frame and the Failure Records.

Conditions for Clearing the MIL/DTC

* The PCM turns the MIL OFF after 3 consecutive drive trips that the diagnostic runs and does not fail.
* A last test failed (current DTC) clears when the diagnostic runs and does not fail.
* A History DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
* The PCM battery voltage is interrupted.
* Use a scan tool in order to clear the MIL/DTC.

Diagnostic Aids

Check proper calibration for the speedometer.

Test Description

The numbers below refer to the step numbers in the diagnostic table.
2. This step determines if the DTC P0500 is the result of a hard failure or an intermittent condition.
5. This step checks the wiring, the connections, the PCM and the VSS.