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CAN COMMUNICATION SYSTEM Check Bus 2 Line for Short to GND

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DTC Code DTC Name
  Check Bus 2 Line for Short to GND
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DESCRIPTION

There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.

Symptom Trouble Area
There is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
  • Short to GND in CAN main bus wire

  • Short to GND in CAN branch wire

  • Central gateway ECU (network gateway ECU)

  • Shift control ECU

  • Skid control ECU assembly

  • Inverter with converter assembly

  • Sub-battery with control assembly

  • Battery ECU assembly

  • Hybrid vehicle control ECU

  • ECM

  • No. 9 CAN junction connector

  • No. 13 CAN junction connector

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WIRING DIAGRAM


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  1. B004X6IE01

    for LHD

  2. B004XS6E01

    for RHD

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CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

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.

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  • 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 or any 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 negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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  • Some parts must be initialized and set when replacing or removing and installing parts.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the power switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

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

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Tip:
  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

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PROCEDURE


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    CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 9 CAN JUNCTION CONNECTOR)


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

    2. Disconnect the G129 No. 9 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G129-12 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Central gateway ECU (network gateway ECU)
      G129-1 (CANL) - G20-4 (CG)
      G129-13 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Hybrid vehicle control ECU assembly*1
      G129-2 (CANL) - G20-4 (CG)
      G129-14 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Shift control ECU
      G129-3 (CANL) - G20-4 (CG)
      G129-15 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      • Inverter with convert er assembl y*1

      • Skid control ECU assembl y*2

      G129-4 (CANL) - G20-4 (CG)
      G129-16 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher No. 13 CAN junction connector
      G129-5 (CANL) - G20-4 (CG)
      *1: for LHD *2: for RHD
      Result
      Result Proceed to
      OK A
      NG (Central gateway ECU [network gateway ECU] CAN main wire) B
      NG (No. 13 CAN junction connector CAN main wire) C
      NG (Wire to ECU or sensor) D

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    CHECK FOR SHORT TO GND IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 9 CAN JUNCTION CONNECTOR)


    1. Reconnect the G129 No. 9 CAN junction connector.

    2. Disconnect the G66 central gateway ECU (network gateway ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G66-23 (CA1H) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      G66-8 (CA1L) - G20-4 (CG)
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)Click here

    • NG

      REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 9 CAN JUNCTION CONNECTOR)

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    CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 13 CAN JUNCTION CONNECTOR)


    1. Reconnect the G129 No. 9 CAN junction connector.

    2. Disconnect the L118 No. 13 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L118-1 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher ECM
      L118-7 (CANL) - G20-4 (CG)
      L118-2 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      • Skid control ECU assembl y*1

      • Inverter with convert er assembl y*2

      L118-8 (CANL) - G20-4 (CG)
      L118-3 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher No. 9 CAN junction connector
      L118-9 (CANL) - G20-4 (CG)
      L118-4 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Sub-battery with control assembly
      L118-10 (CANL) - G20-4 (CG)
      L118-5 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Battery ECU assembly
      L118-11 (CANL) - G20-4 (CG)
      L118-6 (CANH) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Hybrid vehicle control ECU assembly*2
      L118-12 (CANL) - G20-4 (CG)
      *1: for LHD *2: for RHD
      Result
      Result Proceed to
      OK A
      NG (No. 9 CAN junction connector CAN main wire) B
      NG (Wire to ECU or sensor) C

    • A

      REPLACE NO. 13 CAN JUNCTION CONNECTOR

    • B

      REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 13 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR)

    • CClick here
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    CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECU, SENSOR)


    1. Reconnect all wire harness connectors.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus wire shorted to GND is connected.

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    3. B004T3JC20
      *a

      Component with harness connected

      (Central Gateway ECU [Network Gateway ECU])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G66-23 (CA1H) - G20-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher
      G66-8 (CA1L) - G20-4 (CG)
      Tip:
      • If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to ground in the wire harness and repair or replace the wire harness or connector if necessary.

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ECU OR SENSOR

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR