CAN COMMUNICATION SYSTEM > CAN Main Bus Line for Disconnection (RHD Models)

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 more.

Symptom
Trouble Area
Resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or more
  1. CAN main bus line or connector
  2. DLC3 sub bus line or connector
  3. Junction connector (P-CAN J/C)
  4. Junction connector (D-CAN J/C)

WIRING DIAGRAM


C112569E02


INSPECTION PROCEDURE

1.CHECK DLC3

  1. Turn the engine switch off.



    G026206E28

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

    Standard resistance:
    Tester connection
    		Condition
    		Specified value
    		Result
    L16-6 (CANH) - L16-14 (CANL)
    		Engine Switch OFF
    		108 to 132 Ω
    		A
    L16-6 (CANH) - L16-14 (CANL)
    		Engine Switch OFF
    		132 Ω or more
    		B

    NOTICE:
    When the measured value is 132 Ω or more and a CAN communication system diagnostic trouble code is output, there may be a fault besides disconnection of 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
REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
A


2.CHECK CAN MAIN BUS LINE OR CONNECTOR (P-CAN JUNCTION CONNECTOR)


    G031932E38

  1. Disconnect the CAN main bus line connector (L6) from the P-CAN 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
    L6-1 (CANH) - L6-2 (CANL)
    		Engine Switch off
    		108 to 132 Ω



OK
REPLACE JUNCTION CONNECTOR (P-CAN JUNCTION CONNECTOR)
NG


3.CONNECT CONNECTOR

  1. Reconnect the CAN main bus line connector (L6) to the P-CAN J/C (w/o earth terminal).


NEXT


4.CHECK CAN MAIN BUS LINE OR CONNECTOR


    G031932E61

  1. Disconnect the CAN main bus line connector (L78) from the D-CAN 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
    L78-1 (CANH) - L78-2 (CANL)
    		Engine switch off
    		108 to 132 Ω



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN-H, CAN-L)
OK

REPLACE JUNCTION CONNECTOR (D-CAN JUNCTION CONNECTOR)