RX400h · Service Manual COMMUNICATION SYSTEM

Open in CAN Main Bus Line

Circuit diagnosis

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

C113204E05

INSPECTION PROCEDURE


1. CHECK DLC3

  1. Turn the ignition switch off.

  1. G026206E35
    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 RH J/C)

  1. G030155E20
    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 CENTER J/C)

  1. C110925E07
    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

  1. G030155E20
    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

  1. G031932E75
    Disconnect the steering sensor main bus line connector (J61) 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
    J61-1 (CANH) - J61-2 (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 (J61) to the CAN RH J/C B side (w/o earth terminal).


NEXT


9. CHECK CAN MAIN BUS LINE FOR DISCONNECTION

  1. G031932E71
    Disconnect the CAN main bus line connector (J25) from the CAN RH J/C B side (w/o earth terminal).

  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



OK
REPLACE JUNCTION CONNECTOR (CAN RH J/C)
NG


10. CONNECT CONNECTOR

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


NEXT


11. CHECK CAN MAIN BUS LINE FOR DISCONNECTION

  1. G031934E50
    Disconnect the CAN main bus line connector (J51) from the CAN center J/C A side (w/ 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
    J51-1 (CANH) - J51-2 (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 (J51) to the CAN center J/C A side (w/ earth terminal).


NEXT


13. CHECK CAN MAIN BUS LINE FOR DISCONNECTION

  1. G031934E54
    Disconnect the HV control ECU main bus line connector (J60) from the CAN center J/C A side (w/ 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. C113747E01
    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 (CAN CENTER J/C)
OK


14. CONNECT CONNECTOR

  1. Reconnect the HV control ECU main bus line connector (J60) to the CAN center J/C A side (w/ earth terminal).


NEXT


15. CHECK CAN MAIN BUS LINE FOR DISCONNECTION

  1. C110925E06
    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


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