CAN COMMUNICATION SYSTEM Power Management Control ECU Communication Stop Mode

DESCRIPTION

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

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

  • Applies to Power Management Control ECU Communication Stop Mode in DTC Combination Table.

  • Power management control ECU branch wire or connector

  • Power source circuit of power management control ECU

  • Power management control ECU

WIRING DIAGRAM

A0043HWE05
A0043HWE06

INSPECTION PROCEDURE

Note


  • Turn the power switch off before measuring the resistances between CAN main bus wires and between CAN main bus branch wires.

  • Turn the power switch off before inspecting CAN bus wires for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

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 WIRES (POWER MANAGEMENT CONTROL ECU BRANCH WIRE)


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

    2. A0042Q7E73
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the L6 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
      L6-25 (CA1H) - L6-24 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. Disconnect the L5 power management control ECU connector.

    2. A00431ME04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L5-6 (E1) - Body Ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL)

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. Reconnect the L5 power management control ECU connector.

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

    3. A00435IE10
      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
      A20-2 (+B2) - Body Ground Power switch on (IG) 11 to 14 V
      A21-5 (+B1) - Body Ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here