P0500

Diagnostic Chart:

Wiring Diagram:

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 directly to the VCM. This pulsing action takes place about 40 times per revolution of output shaft of transmission. The VCM calculates the vehicle speed based on the time between pulses.

CONDITIONS FOR SETTING THE DTC

The following conditions will set the DTC:

^ No MAP DTCs

^ TP angle below 3.125%

^ ECT is above 60°C

^ Engine speed is between 1400-4400 RPM.

^ MAP below 20 kPa

^ Vehicle speed is less than 1 MPH

CONDITIONS FOR CLEARING THE MIL/DTC

^ The VCM turns the MIL OFF after 3 consecutive drive trips when the test has Run and Passed and not Failed.

^ A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant temperature exceeds 70°C (160°F) during the same ignition cycle).

^ Use the scan tool Clear Information function.

^ Disconnect the VCM battery feed for 30 seconds

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 VCM, and the VSS.