Possible Causes

CHECK PCM POWERS AND GROUNDS

CONTROLLER ANTILOCK BRAKE

SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE

SCI RECEIVE CIRCUIT SHORTED TO VOLTAGE

SCI CIRCUITS SHORTED TOGETHER

SCI TRANSMIT CIRCUIT SHORTED TO GROUND

SCI RECEIVE CIRCUIT SHORTED TO GROUND

SCI RECEIVE CIRCUIT OPEN

SCI TRANSMIT CIRCUIT OPEN

POWERTRAIN CONTROL MODULE