CAN COMMUNICATION SYSTEM(w/ Toyota Safety Sense) 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.

    Click here

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

    Click here


  • Power source or inside power management control ECU

  • Power management control ECU branch wire or connector

  • Power management control ECU

WIRING DIAGRAM

A0049DKE03

CAUTION / NOTICE / HINT

Note


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

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

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

  • After the ignition switch is turned off, check that the key 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 ignition 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 ignition 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 WIRE (POWER MANAGEMENT CONTROL ECU BRANCH WIRE)

    A0049T9E02
    Text in Illustration
    *A w/ Stop and Start System
    *B w/o Stop and Start System
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)

    1. Disconnect the power management control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition

      F130-4 (CA3P) - F130-3 (CA3N)*1

      F74-4 (CA3P) - F74-3 (CA3N)*2

      		 Ignition switch off 108 to 132 Ω

      • *1: w/ Stop and Start System

      • *2: w/o Stop and Start System


    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A0049PIE02
    Text in Illustration
    *A w/ Stop and Start System
    *B w/o Stop and Start System
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition

      F130-2 (IG2) - Body ground*1

      F74-2 (IG2) - Body ground*2

      		 Ignition switch ON 11 to 14 V

      F130-8 (AM21) - Body ground*1

      F74-8 (AM21) - Body ground*2

      		 Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      F130-12 (GND) - Body ground*1

      F74-12 (GND) - Body ground*2

      		 Always Below 1 Ω

      • *1: w/ Stop and Start System

      • *2: w/o Stop and Start System

      Result
      Result Proceed to
      OK (w/ Stop and Start System) A
      OK (w/o Stop and Start System) B
      NG C

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR