CAN COMMUNICATION SYSTEM Motor Generator Control ECU Communication Stop Mode

Info Added 2017-10-06

DESCRIPTION

Detection Item Symptom Trouble Area
Motor Generator Control ECU Communication Stop Mode

Any of the following conditions are met:


  • Communication stop for "Motor Generator" is indicated on the "Communication Bus Check" screen of the GTS.

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  • Communication stop history for "Motor Generator" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Motor Generator" is 6 or more.)

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  • Communication system DTCs (DTCs that start with U) that correspond to "Motor Generator Control ECU Communication Stop Mode" in "DTC Combination Table" are output.

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  • Inverter with converter assembly branch line or connector

  • Power source circuit of inverter with converter assembly

  • Inverter with converter assembly ground circuit

  • Inverter with converter assembly

WIRING DIAGRAM


  1. for LHD

    A001O0HE08
    *a No. 10 CAN Junction Connector
    *b from IGCT Relay
    *c IGCT NO. 2
    *d Inverter with Converter Assembly

  2. for RHD

    A001O0HE09
    *a No. 3 CAN Junction Connector
    *b from IGCT Relay
    *c IGCT NO. 2
    *d Inverter with Converter Assembly

CAUTION / NOTICE / HINT

CAUTION:


  • B0048QQ

    Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.


    • Inspecting the high-voltage system

    • Disconnecting the low voltage connector of the inverter with converter assembly

    • Disconnecting the low voltage connector of the HV battery

  • A001Q5W

    To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.

  • A001NTN

    After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • A001S62C04
    *a Without waiting for 10 minutes

    After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

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    Tech Tips

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

    Note

    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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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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  • 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 at least approximately 8 seconds.

  • 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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  • Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips


  • 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.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS LINES (INVERTER WITH CONVERTER ASSEMBLY BRANCH LINE)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

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

    3. Disconnect the inverter with converter assembly connector.

    4. A001PELC05
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C65-1 (CANH) - C65-7 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A001PELC06
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C65-23 (GND2) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      C65-24 (GND1) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

    2. Reconnect the cable to the negative (-) auxiliary battery terminal.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C65-5 (+B2) - Body ground Power switch on (IG) 11 to 14 V
      C65-6 (+B) - Body ground Power switch on (IG) 11 to 14 V
      C65-12 (IGCT) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Result
      OK
      NG

    OK

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)