CAN COMMUNICATION SYSTEM Hybrid Vehicle Control ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Hybrid Vehicle Control ECU Communication Stop Mode

Any of the following conditions are met:


  • Communication stop for "Hybrid Vehicle Control" is indicated on "Communication Bus Check".

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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 main wire or connector

  • Hybrid vehicle control ECU CAN branch wire or connector

  • Power source circuit of hybrid vehicle control ECU

  • Hybrid vehicle control ECU ground circuit

  • Hybrid vehicle control ECU

WIRING DIAGRAM

B002KACE06

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

  • 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 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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Tech Tips


  • 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 MAIN WIRE AND BRANCH WIRE)


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

    2. B002JZDC08
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      Disconnect the hybrid vehicle control ECU connectors.

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

      Standard Resistance
      Bus 2 Branch Wire
      Tester Connection Condition Specified Condition
      I115-34 (CA2H) - I115-35 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Bus 5 Main Wire
      Tester Connection Condition Specified Condition
      I116-25 (CA1H) - I116-24 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (Bus 2 branch wire) B
      NG (Bus 5 main wire) C

    B

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRSUIT)


    1. Disconnect the hybrid vehicle control ECU connectors.

      B002J3DC08
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I115-6 (E1) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      I115-5 (E01) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      I116-4 (E12) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      I116-5 (E02) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

    3. Reconnect 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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    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      I116-3 (BATT) - Body ground Power switch off 11 to 14 V
      A60-1 (+B2) - Body ground Auxiliary battery voltage applied to terminal A61-6 (MREL) 11 to 14 V
      A61-4 (+B1) - Body ground Auxiliary battery voltage applied to terminal A61-6 (MREL) 11 to 14 V
      A60-3 (IG2) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      A60-22 (ACCI) - Body ground Power switch on (ACC) 11 to 14 V
      Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRSUIT)