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.

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 illuminates the malfunction indicator lamp (MIL) on the second consecutive drive trip that the diagnostic runs and fails.
^ Cruise Control is disabled.
^ The ECM records the operating conditions at the time when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
^ The ECM stores P0500 in ECM history.

Conditions for Clearing the MIL/DTC
^ The ECM turns OFF the MIL after three consecutive ignition cycles in which the diagnostic test runs and passes.
^ A scan tool can clear the MIL/DTC.
^ The ECM clears the DTC from ECM history if the vehicle completes 40 warm-up cycles without an 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

Steps 1-6:

Steps 7-15:

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.