With ZF S6-650 M/T

DTC P0500 (6.6L)





Circuit Description
The vehicle speed sensor (VSS) assembly provides vehicle speed information to the engine control module (ECM). The VSS assembly is a permanent magnet generator. The VSS produces alternating current (AC) as the rotor teeth on the output shaft of the transmission, 2WD, or transfer case, 4WD, pass through the magnetic field of the sensor. The frequency and amplitude of the AC waveform increase as vehicle speed increases.

If the ECM detects no vehicle speed for a specified length of time, while other sensors indicate that the vehicle is moving, DTC P0500 sets. DTC P0500 is a type B DTC.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0500 Vehicle Speed Sensor (VSS) Circuit

Conditions for Running the DTC
^ The engine speed is greater than 1,000 RPM.
^ The engine torque is greater than 300 Nm (221 ft. lbs.).
^ The ECT is greater than 25°C (77°F).

Conditions for Setting the DTC
The ECM detects no vehicle speed for 8 seconds.

Action Taken When the DTC Sets
^ The ECM does not illuminate the malfunction indicator lamp (MIL).
^ The ECM disables Cruise Control.
^ The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Failure Records.
^ The ECM stores DTC P0500 in ECM history.

Conditions for Clearing the DTC
^ A scan tool can clear the DTC.
^ The ECM clears the DTC from ECM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
^ The ECM cancels the DTC default actions when the fault no longer exists and the DTC passes.

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.
4. The vehicle speed detector in the ECM 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.
8. This step isolates the short between the VSS and the wiring.