P1380

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 Powertrain Control Module (PCM) detects this condition on the Class 2 Serial Data circuit, this Diagnostic Trouble Code (DTC) will be set.

CONDITIONS FOR RUNNING THE DTC
^ The vehicle speed is at least 2 km/h (1 mph).
^ The engine speed is less than 5,800 RPM.
^ The engine load is less than 89 percent.

CONDITIONS FOR SETTING THE DTC
The PCM determines that the Antilock Brake System (ABS) is unable to detect a rough road condition.

ACTION TAKEN WHEN THE DTC SETS
^ The control module stores the DTC information into memory when the diagnostic runs and fails.
^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
^ The driver information center, if equipped, may display a message.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC Last Test Failed clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ Use a scan tool in order to clear the DTC.

DIAGNOSTIC AIDS
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 and Poor Connections in Diagrams.

If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Diagrams.

TEST DESCRIPTION

Steps 1-5:

The number below refers to the step number on the diagnostic table.
2. This step isolates an open serial data circuit from the EBCM system.