CAN COMMUNICATION SYSTEM Power Management Control ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Power Management Control ECU Communication Stop Mode

Either condition is met:


  • Communication stop for "Power Management" is indicated on the "Communication Bus Check" screen of the GTS.

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

  • Power management control ECU main line or connector

  • Power management control ECU branch line or connector

  • Power source circuit of power management control ECU

  • Power management control ECU

WIRING DIAGRAM

B001MNGE02

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 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 (POWER MANAGEMENT CONTROL ECU MAIN LINE OR BRANCH LINE)


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

    2. B001LRZC02
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the H3 and H4 power management control ECU connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H4-25 (CA1H) - H4-24 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      H3-34 (CA2H) - H3-35 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (Bus 2 Branch line) B
      NG (Bus 5 Main line) C

    B

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (POWER MANAGEMENT CONTROL ECU)

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


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

    2. Reconnect the H3 and H4 power management control ECU connectors.

    3. B001KB4E02
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A20-5 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      A19-2 (+B2) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. Disconnect the H3 power management control ECU connector.

    2. B001N3QE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H3-6 (E1) - Body ground Always Below 1 Ω

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL)