CAN COMMUNICATION SYSTEM(for LHD) Hybrid Vehicle Control ECU Communication Stop Mode

DTC Code DTC Name
Hybrid Vehicle Control ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Hybrid Vehicle Control ECU Communication Stop Mode

Either condition is met:

  • Communication stop for "Hybrid Vehicle Control" is indicated on the "Communication Bus Check" screen of the GTS.

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

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  • Hybrid vehicle control ECU CAN branch wire or connector

  • Hybrid vehicle control ECU CAN main wire or connector

  • Power source circuit of hybrid vehicle control ECU

  • Hybrid vehicle control ECU ground circuit

  • Hybrid vehicle control ECU

WIRING DIAGRAM

C347060E05

CAUTION / NOTICE / HINT

Note:

  • 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 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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  • 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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  • 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 11.6 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.

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

Tip:

  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • 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 FOR OPEN IN CAN BUS WIRE (HYBRID VEHICLE CONTROL ECU CAN MAIN/BRANCH WIRE)

    1. C306940C06

      *A

      Bus 2

      *B

      Bus 5

      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

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

    2. Disconnect the hybrid vehicle control ECU connectors.

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

      Standard Resistance

      Table 1. Bus 2

      Tester Connection

      Condition

      Specified Value

      G194-25 (CA1H) - G194-24 (CA1L)

      Cable disconnected from negative (-) auxiliary battery terminal

      54 to 69 Ω
      Table 2. Bus 5

      Tester Connection

      Condition

      Specified Value

      G193-34 (CA2H) - G193-35 (CA2L)

      Cable disconnected from negative (-) auxiliary battery terminal

      108 to 132 Ω

    Result

    Proceed to

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE CAN MAIN/BRANCH WIRE CONNECTED TO HYBRID VEHICLE CONTROL ECU (CA1H, CA1L, CA2H, CA2L)

    OK

  2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY AND BODY GROUND)

    1. Connect the cable to the negative (-) auxiliary battery terminal.

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

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      C306934C10

      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      -

      -

    2. Disconnect the hybrid vehicle control ECU connectors.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G194-3 (BATT) - Body ground

      Power switch off

      11 to 14 V

      A65-1 (+B2) - Body ground

      Auxiliary battery voltage applied to terminal A66-6 (MREL)

      11 to 14 V

      A66-4 (+B1) - Body ground

      Auxiliary battery voltage applied to terminal A66-6 (MREL)

      11 to 14 V

      A65-3 (IG2) - Body ground

      Power switch on (IG)

      11 to 14 V

      A65-22 (ACCI) - Body ground

      Power switch on (ACC)

      11 to 14 V

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G193-6 (E1) - Body ground

      Always

      Below 1 Ω

      G193-5 (E01) - Body ground

      Always

      Below 1 Ω

      G194-4 (E12) - Body ground

      Always

      Below 1 Ω

      G194-5 (E02) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    Proceed to

    OK

    NG
    OK

    REPLACE HYBRID VEHICLE CONTROL ECU

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR