CAN COMMUNICATION SYSTEM(for LHD) Electric Power Control ECU Communication Stop Mode

DESCRIPTION

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

Either condition is met:


  • "Electric Power Control" is not displayed on "Bus Check".

  • "Electric Power Control ECU Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside of electric power control ECU (passenger side junction block)

  • Electric power control ECU (passenger side junction block) CAN branch wire or connector

  • Electric power control ECU (passenger side junction block)

WIRING DIAGRAM

A001DGZE01

CAUTION / NOTICE / HINT

Note

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

Tech Tips

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

PROCEDURE


  1. PRECAUTION

    Note

    After turning the engine 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.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

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


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (ELECTRIC POWER CONTROL ECU CAN BRANCH WIRE)


    1. A001DXPE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Electric Power Control ECU [Passenger Side Junction Block])

      Disconnect the electric power control ECU (passenger side junction block) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A69-15 (CANH) - A69-14 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE ELECTRIC POWER CONTROL ECU CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  4. CHECK HARNESS AND CONNECTOR (ELECTRIC POWER CONTROL ECU - BATTERY AND BODY GROUND)


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

      A001AP7E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Electric Power Control ECU [Passenger Side Junction Block])

      		 - -

      Note

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

    2. Disconnect the electric power control ECU (passenger side junction block) connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      PM-1 (BECU) - Body ground Always 11 to 14 V
      PK-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      PA-39 (GND) - Body ground Always Below 1 Ω

    OK

    REPLACE ELECTRIC POWER CONTROL ECU (PASSENGER SIDE JUNCTION BLOCK)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR