P0500

Schematic:

CIRCUIT DESCRIPTION
The left rear wheel speed sensor provides a signal to the Electronic Brake And Traction Control Module (EBTCM). In addition to wheel speed information, the signal from the left rear wheel speed sensor provides the only input for vehicle speed information. The EBTCM sends out a vehicle speed signal based on the information from this sensor. The vehicle speed signal is sent to the theft deterrent module and to all other modules requiring vehicle speed information. The vehicle speed signal to the theft deterrent module is then sent to the engine control module on the same circuit used to communicate the theft deterrent information.

CONDITIONS FOR RUNNING THE DTC
^ The decel fuel cut-off is enabled.
^ The engine speed is between 1800-2200 RPM.
^ The Engine Coolant Temperature (ECT) is more than 65°C (149°F).

CONDITIONS FOR SETTING THE DTC
The Vehicle Speed Signal (VSS) is less than 20 km/h (12 mph) for longer than 1 second.

ACTION TAKEN WHEN THE DTC SETS
The ECM turns ON the Malfunction Indicator Lamp (MIL) and records the operating conditions in the Freeze Frame on the second consecutive drive trip that the diagnostic runs and fails.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The ECM turns OFF the MIL after three consecutive drive trips that the diagnostic runs and passes.
^ A History DTC clears after forty consecutive warm-up cycles in which no failures are reported by this diagnostic or any other emission related diagnostic.
^ The scan tool clears the MIL/DTC.

DIAGNOSTIC AIDS
Refer to Testing for Intermittent and Poor Connections in Diagrams for intermittent concerns.

TEST DESCRIPTION

Steps 1 - 3:

Steps 4 - 9:

Steps 10 - 18:

The numbers below refer to the step numbers on the diagnostic table.
2. If a DTC P1502 is set, the vehicle will not start or may start and stall. DTC P1502 indicates the condition causing the DTC P0500 is located in the circuit between the theft deterrent module and the ECM.
3. This step is to determine if the EBTCM is capable of producing a vehicle speed signal.
6. This step is to determine if the vehicle speed signal is available at the theft deterrent module.
7. This step is to determine if the theft deterrent module is causing the loss of the vehicle speed signal.
8. This step is to isolate each of the modules connected to the vehicle speed signal circuit to determine if any of the modules are causing the loss of the signal. This step also prepares the vehicle for the next two steps by having all of the components on the signal circuit disconnected in order to test for a short to ground or a short to voltage.