Circuit Description
This diagnostic trouble code (DTC) is used to determine when the electronic brake control module (EBCM) has lost the ability to provide rough road data to the control module for misfire detection (DTC P0300). When the control module detects this condition on the Class 2 Serial Data circuit, this DTC will be set.
Conditions for Running the DTC
| • | The vehicle speed is more than 1 mph (2 km/h). |
| • | The engine speed is less than 5,800 RPM. |
| • | The engine load is less than 89 percent. |
Conditions for Setting the DTC
The vehicle control module (VCM) determines that the anti-lock brake (ABS) system is unable to detect a rough road condition.
Action Taken When the DTC Sets
The malfunction indicator lamp (MIL) will not be illuminated and a history DTC is stored.
Conditions for Clearing the MIL/DTC
| • | A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. |
| • | A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant temperature exceeds 70°C (160°F) during the same ignition cycle. |
| • | Use the scan tool Clear Information function. |
Diagnostic Aids
Inspect for intermittents.
An intermittent may be caused by any of the following conditions:
| • | A poor connection |
| • | Rubbed through wire insulation |
| • | A broken wire inside the insulation |
Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
Was a problem found? | -- | Go to Diagnostic System Check in Antilock Brake System | ||
3 | Repair the circuit as necessary. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
4 |
Does the scan tool indicate that the diagnostic Passed? | -- | ||
5 | Does the scan tool display any additional undiagnosed DTCs? | -- | Go to the applicable DTC table | System OK |
