Open in One Side of CAN Branch Line
Open in One Side of CAN Branch LineDESCRIPTION
If 2 or more ECUs and / or sensors do not appear on the intelligent tester's "BUS CHECK" screen, one side of the CAN branch wire may be open. (One side of the CANH [branch wire] / CANL [branch wire] of the ECU and / or sensor is open.)
Wiring Diagram:
Step 1-2:
Step 2 (Continued)-5:
Step 5 (Continued)-7:
Step 7 (Continued):
INSPECTION PROCEDURE
NOTE: Turn the power switch OFF before measuring the resistances of the main wire and the branch wire.
HINT:
- Perform the following inspection for the ECUs (sensors) which are not displayed on the intelligent tester. If a malfunction cannot be identified, perform the following inspections for the ECUs (sensors) connected to the CAN communication system.
- Do not remove the hybrid vehicle control ECU and ECM, as they are the end parts of the circuit. If removed, CAN communication will not be possible.
- The open circuit confirmation of the hybrid vehicle control ECU, ECM and main wire is performed in the CHECK CAN BUS LINE procedure of HOW TO PROCEED WITH TROUBLESHOOTING. This inspection only has procedures for checking for an open circuit on one side of the CAN branch wire.