Open in One Side of CAN Branch Line

NETWORKING: 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, 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.)

*1: w/ Bus Buffer ECU

*2: w/ 4WD

*3: w/ Air Suspension

*4: w/ Dynamic Laser Cruise Control System

WIRING DIAGRAM

INSPECTION PROCEDURE

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 combination meter 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 combination meter, 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 CAN BRANCH WIRE (DISTANCE CONTROL ECU)

HINT
For vehicles without dynamic laser cruise control system, go to step 3.

(a) Disconnect the A43 distance control ECU connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU)
A -- Continue to next step.

2. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (DISTANCE CONTROL ECU BRANCH WIRE)

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (DISTANCE CONTROL ECU)

OK -- REPLACE DISTANCE CONTROL ECU ASSY

3. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU)

(a) Disconnect the H2 main body ECU connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SKID CONTROL ECU)
A -- Continue to next step.

4. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU BRANCH WIRE)

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (MAIN BODY ECU)

OK -- REPLACE MAIN BODY ECU

5. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SKID CONTROL ECU)

(a) Disconnect the A19 skid control ECU connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (STEERING ANGLE SENSOR)
A -- Continue to next step.

6. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SKID CONTROL ECU BRANCH WIRE)

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU)

OK -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY Removal

7. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (STEERING ANGLE SENSOR)

(a) Disconnect the H6 steering angle sensor connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (BUS BUFFER ECU)
A -- Continue to next step.

8. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (STEERING ANGLE SENSOR BRANCH WIRE)

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (STEERING ANGLE SENSOR)

OK -- REPLACE STEERING ANGLE SENSOR Removal

9. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (BUS BUFFER ECU)

HINT
For vehicles without a bus buffer ECU, go to step 11.

(a) Disconnect the H66 bus buffer ECU connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR)
A -- Continue to next step.

10. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (BUS BUFFER ECU BRANCH WIRE)

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (BUS BUFFER ECU)

OK -- REPLACE BUS BUFFER ECU

11. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR)

(a) Disconnect the H56 center airbag sensor connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER STEERING ECU)
A -- Continue to next step.

12. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR BRANCH WIRE)

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CENTER AIRBAG SENSOR)

OK -- REPLACE CENTER AIRBAG SENSOR Removal

13. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER STEERING ECU)

(a) Disconnect the H117 power steering ECU connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SUSPENSION CONTROL ECU)
A -- Continue to next step.

14. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (POWER STEERING ECU BRANCH WIRE)

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (POWER STEERING ECU)

OK -- REPLACE POWER STEERING ECU Removal

15. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SUSPENSION CONTROL ECU)

HINT
For vehicles without an air suspension, go to step 17.

(a) Disconnect the O18 suspension control ECU connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (4WD CONTROL ECU)
A -- Continue to next step.

16. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (SUSPENSION CONTROL ECU BRANCH WIRE)

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SUSPENSION CONTROL ECU)

OK -- REPLACE SUSPENSION CONTROL ECU Removal

17. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (4WD CONTROL ECU)

HINT
For vehicles without 4WD, go to step 19.

(a) Disconnect the A28 4WD control ECU connector.

(b) Select "CAN Bus Check" on the Techstream Diagnosis System.

Result

B -- CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER BRANCH WIRE)
A -- Continue to next step.

18. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (4WD CONTROL ECU BRANCH WIRE)

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (4WD CONTROL ECU)

OK -- REPLACE 4WD CONTROL ECU Removal

19. CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER BRANCH WIRE)

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Disconnect the H24 air conditioning amplifier connector.

Text in Illustration

NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER)

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal