CAN COMMUNICATION SYSTEM(for LHD) Check Bus 3 Lines for Short Circuit

DTC Code DTC Name
Check Bus 3 Lines for Short Circuit

DESCRIPTION

There may be a short circuit between the bus 3 CAN main wires and/or CAN branch wires when the resistance between terminals 6 (CA3H) and 21 (CA3L) of the central gateway ECU is below 54 Ω.

Detection Item

Trouble Area

Resistance between terminals 6 (CA3H) and 21 (CA3L) of central gateway ECU is below 54 Ω.

  • Short in bus 3 CAN main wires

  • Short in bus 3 CAN branch wires

  • Central gateway ECU

  • Radio and display receiver assembly*1

  • Telematics transceiver*2

  • No. 8 CAN junction connector

  • No. 11 CAN junction connector*2

*1: w/ Audio and Visual System (for Radio and Display Type)

*2: w/ Telematics Transceiver

WIRING DIAGRAM

Figure 1. w/o Telematics Transceiver:
C334603E06
Figure 2. w/ Telematics Transceiver:
C348161E02

CAUTION / NOTICE / HINT

Note:

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work.

    Click hereClick here

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

    Click here

Tip:

  • Operating the power switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

  1. CHECK VEHICLE TYPE

    1. Check vehicle type.

    Result

    Result

    Proceed to

    w/o Telematics Transceiver

    A

    w/ Telematics Transceiver

    B
    B

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 8 CAN JUNCTION CONNECTOR)Click here

    A

  2. CHECK FOR SHORT IN CAN BUS WIRES (NO. 8 CAN JUNCTION CONNECTOR)

    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

      C311975C70

      *a

      Front view of wire harness connector

      (to No. 8 CAN Junction Connector)

      *b

      to Radio and Display Receiver Assembly (w/ Audio and Visual System [for Radio and Display Type])

      *c

      to Central Gateway ECU

      -

      -

    2. Disconnect the No. 8 CAN junction connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Connect to

      G173-1 (CANH) - G173-12 (CANL)

      Cable disconnected from negative (-) auxiliary battery terminal

      200 Ω or higher

      Radio and display receiver assembly*

      G173-3 (CANH) - G173-14 (CANL)

      Cable disconnected from negative (-) auxiliary battery terminal

      108 to 132 Ω

      Central gateway ECU

      G173-4 (CANH) - G173-15 (CANL)

      Cable disconnected from negative (-) auxiliary battery terminal

      108 to 132 Ω

      Central gateway ECU

      *: w/ Audio and Visual System (for Radio and Display Type)

    Result

    Proceed to

    OK

    A

    NG (Central gateway ECU CAN main wire)

    B

    NG (ECU or sensor CAN branch wires)

    C
    A

    REPLACE NO. 8 CAN JUNCTION CONNECTOR

    C

    CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)Click here

    B

  3. CONNECT CONNECTOR

    1. Reconnect the G173 No. 8 CAN junction connector.

    Result

    Proceed to

    NEXT
    NEXT

  4. CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU)

    1. C326490C27

      *a

      Front view of wire harness connector

      (to Central Gateway ECU)

      Disconnect the central gateway ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G170-6 (CA3H) - G170-21 (CA3L)

      Cable disconnected from negative (-) auxiliary battery terminal

      200 Ω or higher

      G170-19 (CAYH) - G170-20 (CAYL)

      Cable disconnected from negative (-) auxiliary battery terminal

      200 Ω or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE CENTRAL GATEWAY ECU

    Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU - NO. 8 CAN JUNCTION CONNECTOR)

  5. CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)

    1. C334654C01

      *a

      Component with harness connected

      (Central Gateway ECU)

      Reconnect the CAN junction connector.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited CAN branch wire is connected.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G170-6 (CA3H) - G170-21 (CA3L)

      Cable disconnected from negative (-) auxiliary battery terminal

      54 to 69 Ω
      Tip:

      If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR CAN BRANCH WIRES OR CONNECTOR

  6. CHECK FOR SHORT IN CAN BUS WIRES (NO. 8 CAN JUNCTION CONNECTOR)

    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

      C348123C03

      *a

      Front view of wire harness connector

      (to No. 8 CAN Junction Connector)

      *b

      to Radio and Display Receiver Assembly (w/ Audio and Visual System [for Radio and Display Type])

      *c

      to No. 11 CAN Junction Connector

      *d

      to Central Gateway ECU

    2. Disconnect the No. 8 CAN junction connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Connect to

      G173-1 (CANH) - G173-12 (CANL)

      Cable disconnected from negative (-) auxiliary battery terminal

      200 Ω or higher

      Radio and display receiver assembly*

      G173-2 (CANH) - G173-13 (CANL)

      Cable disconnected from negative (-) auxiliary battery terminal

      108 to 132 Ω

      No. 11 CAN junction connector

      G173-3 (CANH) - G173-14 (CANL)

      Cable disconnected from negative (-) auxiliary battery terminal

      108 to 132 Ω

      Central gateway ECU

      *: w/ Audio and Visual System (for Radio and Display Type)

    Result

    Result

    Result

    Proceed to

    OK

    A

    NG (No. 11 CAN junction connector CAN main wire)

    B

    NG (Central gateway ECU CAN main wire)

    C

    NG (ECU or sensor CAN branch wires)

    D
    A

    REPLACE NO. 8 CAN JUNCTION CONNECTOR

    C

    CONNECT CONNECTORClick here

    D

    CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)Click here

    B

  7. CONNECT CONNECTOR

    1. Reconnect the G173 No. 8 CAN junction connector.

    Result

    Proceed to

    NEXT
    NEXT

  8. CHECK FOR SHORT IN CAN BUS WIRES (NO. 11 CAN JUNCTION CONNECTOR)

    1. Disconnect the No. 11 CAN junction connector.

      C348123C06

      *a

      Front view of wire harness connector

      (to No. 11 CAN Junction Connector)

      *b

      to Telematics Transceiver

      *c

      to Central Gateway ECU

      *d

      to No. 8 CAN Junction Connector

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      Connect to

      M45-1 (CANH) - M45-12 (CANL)

      Cable disconnected from negative (-) auxiliary battery terminal

      200 Ω or higher

      Telematics transceiver

      M45-2 (CANH) - M45-13 (CANL)

      Cable disconnected from negative (-) auxiliary battery terminal

      108 to 132 Ω

      Central gateway ECU

      M45-3 (CANH) - M45-14 (CANL)

      Cable disconnected from negative (-) auxiliary battery terminal

      108 to 132 Ω

      No. 8 CAN junction connector

    Result

    Result

    Result

    Proceed to

    OK

    A

    NG (No. 8 CAN junction connector CAN main wire)

    B

    NG (Central gateway ECU CAN main wire)

    C

    NG (ECU or sensor CAN branch wires)

    D
    A

    REPLACE NO. 11 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - NO. 8 CAN JUNCTION CONNECTOR)

    D

    CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)Click here

    C

  9. CONNECT CONNECTOR

    1. Reconnect the M45 No. 11 CAN junction connector.

    Result

    Proceed to

    NEXT
    NEXT

  10. CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU)

    1. C348160C01

      *a

      Front view of wire harness connector

      (to Central Gateway ECU)

      Disconnect the central gateway ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G170-19 (CAYH) - G170-20 (CAYL)

      Cable disconnected from negative (-) auxiliary battery terminal

      200 Ω or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE CENTRAL GATEWAY ECU

    Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU - NO. 11 CAN JUNCTION CONNECTOR)

  11. CONNECT CONNECTOR

    1. Reconnect the G173 No. 8 CAN junction connector.

    Result

    Proceed to

    NEXT
    NEXT

  12. CHECK FOR SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU)

    1. C348160C02

      *a

      Front view of wire harness connector

      (to Central Gateway ECU)

      Disconnect the central gateway ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G170-6 (CA3H) - G170-21 (CA3L)

      Cable disconnected from negative (-) auxiliary battery terminal

      200 Ω or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE CENTRAL GATEWAY ECU

    Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU - NO. 8 CAN JUNCTION CONNECTOR)

  13. CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)

    1. C334654C01

      *a

      Component with harness connected

      (Central Gateway ECU)

      Reconnect the CAN junction connector.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited CAN branch wire is connected.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G170-6 (CA3H) - G170-21 (CA3L)

      Cable disconnected from negative (-) auxiliary battery terminal

      54 to 69 Ω
      Tip:

      If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR CAN BRANCH WIRES OR CONNECTOR