CAN COMMUNICATION SYSTEM Hybrid Vehicle Control ECU Communication Stop Mode

DESCRIPTION

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

Either condition is met:


  • "Hybrid Vehicle Control" is not displayed on the CAN Bus Check screen of the GTS.

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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 assembly branch line or connector

  • Power source circuit of hybrid vehicle control ECU assembly

  • Hybrid vehicle control ECU assembly ground circuit

  • Hybrid vehicle control ECU assembly

WIRING DIAGRAM

A0022PME01
A0022PME02

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 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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  • 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), turn the cruise control main switch on, wait at least 60 seconds and then drive the vehicle at a speed of 36 km/h (22 mph) or more for 300 seconds 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.

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

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 LINES (HYBRID VEHICLE CONTROL ECU ASSEMBLY BRANCH LINE)


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

    2. Disconnect the K142 hybrid vehicle control ECU assembly connector.

    3. A0021DQC68
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K142-25 (CA1H) - K142-24 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the K141 hybrid vehicle control ECU assembly connector.

    2. B003YJ4C46
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K141-5 (E01) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      K141-6 (E1) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      K142-4 (E12) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      K142-5 (E02) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

    3. Reconnect the K141 and K142 hybrid vehicle control ECU assembly connectors.

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

    5. B003YQXC02
      *a

      Component wire harness connector

      (Hybrid Vehicle Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A84-1 (+B2) - Body ground Power switch on (IG) 11 to 14 V
      A85-4 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Result
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)