Open in One Side of CAN Branch Line
CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Open in One Side of CAN Branch Line
- Open in One Side of CAN Branch Line
DESCRIPTION
If 2 or more ECUs and/or sensors do not appear on the Techstream "CAN Bus CHECK" screen, either the CANH side or CANL side of a branch wire or sensor may be open.
HINT
*1: w/ Dynamic radar cruise control system
*2: w/ Navigation system
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
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 Techstream. 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.
PROCEDURE
1. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (NETWORK GATEWAY ECU)
(a) Disconnect the K66 network gateway ECU connector.
(b) Select "CAN Bus Check" on the Techstream display via the CAN VIM Diagnosis System.
Result
B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (CLEARANCE WARNING ECU)
A -- Continue to next step.
2. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (NETWORK GATEWAY ECU BRANCH WIRE)
(a) Measure the resistance of the wire harness side connector.
Standard resistance:
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NETWORK GATEWAY ECU)
OK -- REPLACE NETWORK GATEWAY ECU
3. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (CLEARANCE WARNING ECU)
(a) Disconnect the A38 clearance warning ECU connector.
(b) Select "CAN Bus Check" on the Techstream display via the CAN Diagnosis System.
Result
B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (DISTANCE CONTROL ECU)
A -- Continue to next step.
4. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (CLEARANCE WARNING ECU BRANCH WIRE)
(a) Measure the resistance of the wire harness side connector.
Standard resistance:
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CLEARANCE WARNING ECU)
OK -- REPLACE CLEARANCE WARNING ECU
5. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (DISTANCE CONTROL ECU)
(a) Disconnect the K13 distance control ECU connector.
(b) Select "CAN Bus Check" on the Techstream display via the CAN Diagnosis System.
Result
B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (NAVIGATION ECU)
A -- Continue to next step.
6. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (DISTANCE CONTROL ECU BRANCH WIRE)
(a) Measure the resistance of the wire harness side connector.
Standard resistance:
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (DISTANCE CONTROL ECU)
OK -- REPLACE DISTANCE CONTROL ECU
7. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (NAVIGATION ECU)
(a) Disconnect the K46 navigation ECU connector.
(b) Select "CAN Bus Check" on the Techstream display via the CAN Diagnosis System.
Result
B -- CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (SEAT BELT CONTROL ECU BRANCH WIRE)
A -- Continue to next step.
8. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (NAVIGATION ECU BRANCH WIRE)
(a) Measure the resistance of the wire harness side connector.
Standard resistance:
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NAVIGATION ECU)
OK -- REPLACE NAVIGATION ECU
9. CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (SEAT BELT CONTROL ECU BRANCH WIRE)
(a) Disconnect the V43 seat belt control ECU connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SEAT BELT CONTROL ECU)
OK -- REPLACE SEAT BELT CONTROL ECU