P0500

DTC P0500

Circuit Description
The engine control module (ECM) receives vehicle speed through high-speed communications on the controller area network (CAN) from the transmission control module (TCM) based on the output speed sensor (OSS). The OSS is attached to the top rear of the transmission case. The sensor produces an AC current generated as the output shaft rotates. The ECM continuously monitors the vehicle speed signal supplied by the TCM.
If the ECM does not detect a sufficient amount of vehicle speed from the TCM over the CAN link when engine speed is above a certain range while the vehicle is in 4th gear, 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
^ No CAN DTCs U2103 or U2105.
^ The engine speed is 1,800-3,000 RPM.
^ The ECM deceleration fuel shutoff is active.
^ The engine coolant temperature (ECT) is greater than 64°C (147°F).
^ The TCM commanded gear is 4th.

Conditions for Setting the DTC
The vehicle speed is less than 5 km/h (3 mph) for a total of 3 seconds.

Action Taken When the DTC Sets
^ The ECM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
^ The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
^ The ECM stores DTC P0500 in ECM history.

Conditions for Clearing the DTC
^ The ECM turns off the MIL during the third consecutive trip in which the diagnostic test runs and passes.
^ A scan tool can clear the DTC.
^ The ECM clears the DTC from ECM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.

Diagnostic Aids
^ If TCM DTCs P0502 or P0503 are set, diagnose these DTCs first.
^ If an output speed sensor signal circuit fault is occurring, a vehicle speed of 0 km/h (0 mph) will be sent to the ECM and the ECM will set DTC P0500.
^ To locate an intermittent problem, use the scan tool to monitor vehicle speed in the ECM data list with the vehicle raised and the drive wheels moving greater than 5 km/h (3 mph). If an intermittent output speed sensor signal is occurring, vehicle speed on the scan tool will go to 0 km/h (0 mph).

Test Description





The numbers below refer to the step numbers on the diagnostic table.
3. Because the TCM supplies the ECM with vehicle speed, the TCM will also have set a DTC.