Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC C0055 01: Rear Wheel Speed Sensor Circuit Short to BatteryDTC C0055 04: Rear Wheel Speed Sensor Open Circuit
DTC C0055 0F: Rear Wheel Speed Sensor Circuit Erratic
DTC C0055 26: Rear Wheel Speed Sensor Circuit Frequency Too Low
DTC P0609: Vehicle Speed Output Circuit
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Rear Wheel Speed Sensor Signal | C0055 04 | C0055 04 | C0055 01 | C0055 08, C0055 26 |
Circuit/System Description
The engine control module (ECM) converts the data from the vehicle speed sensor to a 128K pulses/mile engine speed signal. The electronic brake control module (EBCM) uses the vehicle speed signal from the ECM in order to calculate the rear wheel speed.
Conditions for Running the DTC
| • | Ignition ON. |
| • | Ignition voltage is greater than 10 volts. |
Conditions for Setting the DTC
The EBCM detects a short to voltage, short to ground or an open/high resistance on the rear wheel speed sensor signal circuit.
Action Taken When the DTC Sets
| • | The EBCM disables the Antilock Brake System (ABS) for the duration of the ignition cycle. |
| • | A DIC message and/or a warning indicator may be displayed. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF disconnect the harness connector at the EBCM.
- Ignition ON, test for 9.8 - 10.2 volts between the signal circuit terminal 20 and ground.
- If all circuits test normal, replace the EBCM.
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If all circuits test normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If all circuits test normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM/BPMV or ECM/PCM replacement, setup, and programming
