Rough Road Information

Antilock Brake System EBTCM - PCM Serial Data
The PCM receives rough road information from the Electronic Brake and Traction Control Module (EBTCM) on the serial data circuit. The PCM uses the rough road information to enhance the misfire diagnostic by allowing for crankshaft speed variations caused by driving on rough road surfaces. The EBTCM calculates rough road information by monitoring the ABS wheel speed sensors.

System Faults
If a fault occurs which causes the PCM to not receive rough road information while a misfire DTC is requesting the Malfunction Indicator Lamp (MIL), DTC P1381 will set. When the PCM detects that serial data is OK, but the ABS system is malfunctioning, a DTC P1380 will set.