P0500

Wiring Diagram:

Circuit Description

A toothed wheel mounted on the output shaft of the transmission generates an AC voltage pulse as it moves past the Vehicle Speed Sensor (VSS). The VSS contains a permanent magnet surrounded by a coil of wire, which produces a magnetic field. As the toothed wheel interrupts the magnetic field, an AC voltage pulse is generated. As the vehicle speed increases the AC voltage pulse rate also increases.

The PCM supplies this signal to the cruise control module and instrument cluster.

Conditions for Setting the DTC

- DTCs P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0506, P0507, P1508, P1509 not set.

- Engine coolant temperature greater than 0°C (32°F)

- Engine speed greater than 1000 RPM.

- TP sensor angle greater than 5%.

- Barometric pressure greater than 40 kPa when A/C is OFF.

- Barometric pressure greater than 45 kPa when A/C is ON.

- All conditions met for 25 seconds.

Action Taken When the DTC Sets

- The PCM will illuminate the Malfunction Indicator Lamp (MIL) on the second consecutive drive trip that the diagnostic runs and fails.

- The PCM will record operating conditions at the time the diagnostic fails. The first time the diagnostic fails, this information will be stored in Failure Records. If the diagnostic reports a failure on the second consecutive drive trip, the operating conditions at the time of failure will be written to Freeze Frame and the Failure record will be updated.

Conditions for Clearing the MIL/DTC

- The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.

- A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.

- A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

- PCM battery voltage is interrupted.

- Using a Scan tool.

Diagnostic Aids

If all circuits to the PCM and the VSS have been thoroughly checked, inspect terminal connections at VSS harness connector and at the PCM harness connector. If all connections check OK, replace the PCM.

For intermittents, refer to Symptoms. Testing and Inspection

Test Description

Number(s) below refer to step numbers on the diagnostic table.

2. The ASR/TCS must be disabled when performing this step. Whenever the ignition key is cycled to the OFF position and then cycled back ON, the ASR/TC system will default ON.