CAN COMMUNICATION SYSTEM (for LHD) > Open in CAN Main Bus Line

for Preparation Click here


DESCRIPTION

There may be an open circuit in the CAN main bus line and/or the DLC3 sub bus line when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.

Symptom
Suspected Area
Resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.
  1. CAN main bus line or connector
  2. Junction connector (CAN RH J/C)
  3. Junction connector (CAN Center J/C)
  4. DLC3 sub bus line or connector
  5. Steering sensor
  6. HV control ECU

WIRING DIAGRAM


C113204E04


INSPECTION PROCEDURE

1.CHECK DLC3

  1. Turn the ignition switch off.



    G026206E35

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

    Result:
    Tester Connection
    		Condition
    		Specified Value
    		Proceed to
    D1-6 (CANH) - D1-14 (CANL)
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω
    		A
    D1-6 (CANH) - D1-14 (CANL)
    		Disconnect the negative auxiliary battery cable
    		132 Ω or higher
    		B

    NOTICE:
    When the measured value is 132 Ω or higher and the CAN communication system diagnostic code is output, there may be a fault besides an open in the DLC3 sub bus line. For that reason, troubleshooting should be performed again from "HOW TO PROCEED WITH TROUBLESHOOTING" (Click here) after repairing the trouble area.



B
REPLACE DLC3 SUB BUS LINE OR CONNECTOR
A


2.CHECK CAN MAIN BUS LINE FOR DISCONNECTION (BUS CHECK)

  1. Perform "Communication BUS CHECK" using the intelligent tester (Click here).

    Result:

    Specified Condition
    		Proceed to
    "STEERING SENSOR" only is not displayed
    		A
    "HV CONTROL" only is not displayed
    		B
    Others
    		C



B
Go to step 4

C
Go to step 5
A


3.CHECK CAN MAIN BUS LINE FOR DISCONNECTION (STEERING SENSOR - CAN CENTER J/C)


    G030155E20

  1. Disconnect the steering sensor connector (S10).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Value
    S10-10 (CANH) - S10-9 (CANL)
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω



NG
REPLACE CAN MAIN BUS LINE OR CONNECTOR
OK

REPLACE STEERING SENSOR 

4.CHECK CAN MAIN BUS LINE FOR DISCONNECTION (HV CONTROL ECU - CAN RH J/C)


    C110925E07

  1. Disconnect the HV control ECU connector (H30).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Value
    H30-25 (CANH) - H30-33 (CANL)
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω



NG
REPLACE CAN MAIN BUS LINE OR CONNECTOR
OK

REPLACE HV CONTROL ECU 

5.CHECK CAN MAIN BUS LINE FOR DISCONNECTION


    G030155E20

  1. Disconnect the steering sensor connector (S10).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Value
    S10-10 (CANH) - S10-9 (CANL)
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω



OK
REPLACE STEERING SENSOR
NG


6.CONNECT CONNECTOR

  1. Reconnect the steering sensor connector (S10).


NEXT


7.CHECK CAN MAIN BUS LINE FOR DISCONNECTION


    G031932E70

  1. Disconnect the steering sensor main bus line connector (J54) from the CAN center J/C B side (w/o earth terminal).

    NOTICE:
    1. Before disconnecting the connector, make a note of where it is connected.
    2. Reconnect the connector to its original position.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Value
    J54-1 (CANH) - J54-2 (CANL)
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω



NG
REPLACE CAN MAIN BUS LINE OR CONNECTOR
OK


8.CONNECT CONNECTOR

  1. Reconnect the steering sensor main bus line connector (J54) to the CAN center J/C B side (w/o earth terminal).


NEXT


9.CHECK CAN MAIN BUS LINE FOR DISCONNECTION


    G031934E50

  1. Disconnect the CAN main bus line connector (J51) from the CAN center J/C A side (w/ earth terminal).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Value
    J51-1 (CANH) - J51-2 (CANL)
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω



OK
REPLACE JUNCTION CONNECTOR
NG


10.CONNECT CONNECTOR

  1. Reconnect the CAN main bus line connector (J51) to the CAN center J/C A side (w/ earth terminal).


NEXT


11.CHECK CAN MAIN BUS LINE FOR DISCONNECTION


    G031932E71

  1. Disconnect the CAN main bus line connector (J25) from the CAN RH J/C B side (w/o earth terminal).

    NOTICE:
    1. Before disconnecting the connector, make a note of where it is connected.
    2. Reconnect the connector to its original position.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Value
    J25-1 (CANH) - J25-2 (CANL)
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω



NG
REPLACE CAN MAIN BUS LINE OR CONNECTOR
OK


12.CONNECT CONNECTOR

  1. Reconnect the CAN main bus line connector (J25) to the CAN RH J/C B side (w/o earth terminal).


NEXT


13.CHECK CAN MAIN BUS LINE FOR DISCONNECTION


    G031932E72

  1. Disconnect the HV control ECU main bus line connector (J57) from the CAN RH J/C B side (w/o earth terminal).

    NOTICE:
    1. Before disconnecting the connector, make a note of where it is connected.
    2. Reconnect the connector to its original position.



    C113747E01

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Value
    (CANH) - (CANL)
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω



NG
REPLACE JUNCTION CONNECTOR
OK


14.CONNECT CONNECTOR

  1. Reconnect the HV control ECU main bus line connector (J57) to the CAN RH J/C B side (w/o earth terminal).


NEXT


15.CHECK CAN MAIN BUS LINE FOR DISCONNECTION


    C110925E06

  1. Disconnect the HV control ECU connector (H30).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Value
    H30-25 (CANH) - H30-33 (CANL)
    		Disconnect the negative auxiliary battery cable
    		108 to 132 Ω



OK
REPLACE CAN MAIN BUS LINE OR CONNECTOR
NG

REPLACE HV CONTROL ECU