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" and/or "Hybrid Vehicle Control2" is indicated on the "Communication Bus Check" screen of the GTS.

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  • Communication stop history for "Hybrid Vehicle Control" and/or "Hybrid Vehicle Control2" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Hybrid Vehicle Control" and/or "Hybrid Vehicle Control2" is 6 or more.)

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

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  • Hybrid vehicle control ECU branch line or connector

  • Power source circuit of hybrid vehicle control ECU

  • Hybrid vehicle control ECU ground circuit

  • Hybrid vehicle control ECU

WIRING DIAGRAM

B006I0HE03

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.

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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 52 seconds. Turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch), turn the cruise control main switch on, turn the speed limiter switch on, turn the lane departure alert main switch on and then drive the vehicle at a speed of 20 km/h (12 mph) or more for approximately 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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  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • Before replacing the hybrid vehicle control ECU, refer to Service Bulletin.

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 (HYBRID VEHICLE CONTROL ECU BRANCH LINE)


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

    2. Disconnect the I2 hybrid vehicle control ECU connector.

    3. B006IULC02
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I2-21 (CA1H) - I2-8 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      I2-7 (CA3P) - I2-20 (CA3N) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (HYBRID VEHICLE CONTROL ECU)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the I3 hybrid vehicle control ECU connector.

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

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

      B006IRRC11
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      I3-27 (BATT) - Body ground Power switch off 11 to 14 V
      I2-35 (IG2) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  3. CHECK ECU POWER SOURCE CIRCUIT


    1. Check the ECU power source circuit.

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      Result
      Result
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)