P0500

DTC P0500





Circuit Description
A toothed wheel mounted on the output shaft of the manual 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. The toothed wheel interrupts the magnetic field which induces AC voltage pulses in the coil. As the vehicle speed increases, the AC voltage pulse rate increases. The PCM supplies the VSS signal to the Body Control Module (BCM), the Instrument Panel Cluster (IPC), and the Electronic Suspension Control Module, if equipped.

Conditions for Running the DTC
^ No Manifold Absolute Pressure (MAP) sensor DTC P0107 or P0108.
^ No Engine Coolant Temperature (ECT) sensor DTC P0117 or P0118.
^ No idle control system DTC P0506 or P0507.
^ No Throttle Position (TP) sensor DTC P1120, P1220 or P1221.
^ The ECT is 35°C (95°F) or greater.
^ The engine speed is greater than 1,000 RPM.
^ The TP angle is 5 - 100 percent.
^ The MAP is 40 - 99 kPa when the A/C is OFF.
^ The MAP is 45 - 99 kPa when the A/C is ON.
^ All conditions are met for 2 seconds.

Conditions for Setting the DTC
The PCM detects vehicle speed at 0 km/h (0 mph) for 100 seconds.

Action Taken When the DTC Sets
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive trip that the diagnostic runs and fails.
^ The PCM disables Cruise Control.
^ The PCM records the operating conditions at the time when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
^ The PCM stores P0500 in PCM history.

Conditions for Clearing the MIL/DTC
^ The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic runs and passes.
^ The PCM cancels the DTC default actions when the fault no longer exists and the DTC passes.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
^ A scan tool can clear the MIL/DTC.

Diagnostic Aids
Ensure the VSS is correctly torqued to the transmission housing.








Test Description
The numbers below refer to the step numbers on the diagnostic table.
5. The resistance measurement will not change if either the VSS high signal circuit or the VSS low signal circuit, but not both, is shorted to ground. The vehicle speed detector in the PCM and the VSS are matched in such a way that an open or a short to ground in the VSS low signal circuit will not usually cause a loss of speed signal or a DTC P0500 to set. The lower resistance value given represents the nominal resistance specification of the VSS at -40°C (-40°F), minus the manufacturing tolerance specification of 10 percent. The higher resistance value given represents the nominal resistance specification of the VSS at 150°C (302°F), plus the manufacturing tolerance specification of 10 percent.
8. This step isolates the short between the VSS and the wiring.
10. Do not skip Step 7. The DMM will detect AC voltage if the VSS high signal circuit is shorted to ground.
13. The replacement PCM must be programmed and the crankshaft position system variation procedure must be performed.