C003D
DTC C0055 or C003D
Circuit Description
The powertrain control module (PCM) converts the signal from the vehicle speed sensor (VSS) to a 128 k pulses/mile signal. The electronic brake control module (EBCM) uses the vehicle speed signal from the PCM to calculate the rear wheel speed.
DTC Descriptor
This diagnostic procedure supports the following DTCs:
^ DTC C0055 Rear Wheel Speed Sensor (Both Wheels) Circuit
^ DTC C003D Rear Wheel Speed Sensor (Both Wheels) Circuit (PHT)
Conditions for Running the DTC
^ The ignition is ON.
^ The vehicle speed is greater than 13 km/h (8 mph).
Conditions for Setting the DTC
^ The EBCM detects an open or shorted vehicle speed signal circuit for 500 milliseconds.
^ The EBCM detects the absence of the vehicle speed signal for 5 seconds. If more than one absent wheel speed sensor signal is detected, the condition must be present for 120 seconds to set DTCs.
^ The EBCM detects an erratic vehicle speed signal for 200 milliseconds.
Action Taken When the DTC Sets
^ The EBCM disables the ABS/dynamic rear proportion (DRP).
^ The ABS indicator turns ON.
^ The brake warning indicator turns ON.
The actions above are maintained during subsequent ignition cycles until the EBCM completes a power up self-test. This test concludes when the vehicle achieves a speed greater than 13 km/h (8 mph) and the wheel speeds are verified by the EBCM.
Conditions for Clearing the DTC
The Conditions for Setting the DTC are no longer present and you use the scan tool Clear DTCs function.
Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Intermittent Conditions and Poor Connections, Connector Repairs, Testing for Electrical Intermittents and to Wiring Repairs. Component Tests and General Diagnostics
Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for a voltage signal from the PCM.
4. This step tests for a missing or erratic vehicle speed signal from the PCM. An assistant may be required to perform this test.
