CAN COMMUNICATION SYSTEM (for RHD) > 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 'Communication Bus Check' screen, one side of the CAN sub-bus lines may be open. (One side of the CAN-H [sub-bus line] and CAN-L [sub-bus line] of the ECU and or sensor is open.)

Symptom
Suspected Area
2 or more ECUs and/or sensors do not appear on the intelligent tester "Communication Bus Check" screen.
  1. One side of the CAN sub-bus lines is open
  2. Steering sensor
  3. Gateway ECU
  4. Power steering ECU
  5. Skid control ECU
  6. Television camera ECU
  7. Yaw rate sensor
  8. HV control ECU

WIRING DIAGRAM


C115376E01


INSPECTION PROCEDURE

HINT:
  1. Perform the following inspections for the ECUs (sensors) that are not displayed on the intelligent tester first. If a malfunction is still not able to be identified, perform the following inspections for all other ECUs (sensors) connected to the CAN communication system.
  2. The basic inspection procedures that can be used for all related ECUs in common are shown below.
    "ECU A" represents the following: HV control ECU, steering sensor, yaw rate sensor, skid control ECU, network gateway ECU, television camera ECU, power steering ECU.

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


    C115349E02

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

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

    Result:
    Result
    		Proceed to
    ECUs only are not displayed on the intelligent tester.
    		A
    1. Several ECUs and sensors are not displayed on the intelligent tester.
    2. If the displayed ECUs and sensors are only those relating to the 'ENGINE' and 'HV', proceed to 'A'.
    		B



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


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


    C115349E02

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

    Standard Resistance:
    ECU (Sensor)
    		Condition
    		Specified Value
    HV control ECU
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω
    Steering sensor
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω
    Others
    		Disconnect the negative auxiliary battery cable
    		54 to 69 Ω



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

REPLACE ECU A (SENSOR)