CAN COMMUNICATION SYSTEM > Open in One Side of CAN Sub Bus Line

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DESCRIPTION

If 2 or more ECUs and/or sensors do not appear on the intelligent tester "BUS CHECK" screen via the CAN VIM , one side of the CAN sub-bus line may be open. (ONE side of the CAN-H [sub-bus line] / CAN-L [sub-bus line] of the ECU and/or sensor is open.)

Symptom
Trouble Alrea
2 or more ECUs and/or sensors do not appear on the intelligent tester "BUS CHECK" screen via the CAN VIM.
  1. One side of the CAN sub-bus line is open
  2. Short to GND
  3. Distance control ECU
  4. Steering sensor
  5. Seat belt control ECU
  6. Skid control ECU with actuator (3GR-FE, 3GR-FSE)
  7. Skid control ECU (3UZ-FE)
  8. ECM
  9. Yawrate sensor
  10. Steering control ECU
  11. Power steering ECU
  12. Absorber control ECU
  13. Clearance warning ECU
  14. Television camera ECU
  15. Network gateway ECU
  16. D-CAN J/C
  17. P-CAN J/C

WIRING DIAGRAM


C113202E02


C113203E05


C113200E02


C113201E03


INSPECTION PROCEDURE

HINT:
  1. The following is the troubleshooting procedures of an open in either CANH or CANL of the ECU A (SENSOR A).
  1. Perform the following inspection for the ECUs (sensors) which are not displayed on the intelligent tester. If malfunction cannot be identified, then perform the following inspections for the ECUs (sensors) connected to CAN communication.

1.CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE


    G033752E01

  1. Disconnect the connector with terminals CANH and CANL of the ECU A (SENSOR A).

  1. Select "Check the ECU connected to CAN BUS" on the intelligent tester.

    Result:
    A
    		Only ECUs are not displayed in the intelligent tester.
    B
    		Several ECUs and sensor are not displayed on the intelligent tester.



B
CONNECT THE ECU A CONNECTOR TO THE ECU (SENSOR) AND INSPECT OTHER ECUS (SENSORS) TO MEET "STANDARD A"
A


2.CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE


    G033752E01

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

    Standard resistance:
    Tester connector
    		Condition
    		Specified value
    CANH - CANL
    		Engine switch off
    		54 to 69 Ω



NG
REPAIR OR REPLACE ECU A SUB BUS LINE OR CONNECTOR
OK

REPLACE ECU A (SENSOR A)