U1001 CAN COMM CIRCUIT

Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.

DTC Logic

DTC DETECTION LOGIC

1. Turn ignition switch ON and wait at least 3 seconds.
2. Check DTC. Is DTC detected?

YES >> "Diagnosis Procedure".
NO >> Inspection END

Diagnosis Procedure
Go to See: Powertrain Management\Computers and Control Systems\Information Bus\Testing and Inspection\Initial Inspection and Diagnostic Overview\CAN Fundamental\Trouble Diagnosis Flow Chart.