Immobilizer Control System

U1000 CAN COMM Circuit

Description

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern vehicle is equipped with many electronic control unit, 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.

CAN Communication Signal Chart, refer to [CAN Communication Signal Chart] Signal Chart.

DTC Logic

DTC Detection Logic






Diagnosis Procedure

1. DTC CHECK

1 Turn ignition switch ON and wait for 2 seconds or more.
2 Perform "DTC check".

Is "CAN COMM CIRCUIT" displayed?
YES
Refer to [CAN Communication Control Circuit] CAN Communication Control Circuit.
NO
Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.