CAN COMMUNICATION SYSTEM Power Management Control ECU Communication Stop Mode

DTC Code DTC Name
Power Management Control ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Power Management Control ECU Communication Stop Mode

Either condition is met:

  • "Power Management1" is not displayed on the "can Bus Check" screen (Click here).

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

  • Power management control ECU CAN branch wire or connector

  • Power source circuit of power management control ECU

  • Power management control ECU ground circuit

  • Power management control ECU

WIRING DIAGRAM

C350770E01

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 (Click here).

  • Before measuring the resistance of the CAN bus, turn the ignition 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 (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).

  • 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.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed (Click here).

Tip:

  • Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  • 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 (POWER MANAGEMENT CONTROL ECU CAN BRANCH WIRE)

    1. U122861E02

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

    2. Disconnect the power management control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H71-14 (CA1H) - H71-13 (CA1L)

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω
      Table 1. Text in Illustration

      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (CA1H, CA1L)

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND)

    1. U122862E02

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

      Note:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).

    2. Disconnect the power management control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H71-5 (GND2) - Body ground

      Always

      Below 1 Ω

      H71-6 (GND) - Body ground

      Always

      Below 1 Ω

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      H71-1 (AM22) - Body ground

      Always

      11 to 14 V

      H71-2 (AM21) - Body ground

      Always

      11 to 14 V
    Table 2. Text in Illustration

    *a

    Rear view of wire harness connector

    (to Power Management Control ECU)
    Table 3. Result

    Result

    Proceed to

    OK (for LHD)

    A

    OK (for RHD)

    B

    NG

    C

    REPLACE POWER MANAGEMENT CONTROL ECU

    (Click here)

    REPLACE POWER MANAGEMENT CONTROL ECU

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR