CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (Power Management2)

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U1002 Lost communication with the gateway module (power management bus).

  • Power source circuit of power management control ECU

  • Power management control ECU

  • Power management control ECU main wire or connector

WIRING DIAGRAM

A005V0FE02

INSPECTION PROCEDURE

Note

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

Tech Tips

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

PROCEDURE


  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


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

      CAUTION:

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

      Note


      • w/ Navigation System (for HDD):

        After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.

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


    NEXT

  2. CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU MAIN WIRE)


    1. Disconnect the D75*1 or D104*2 power management control ECU connector.


      • *1: w/ Entry and Start System

      • *2: w/o Entry and Start System

      A005UEHE01

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

      Standard Resistance
      w/ Entry and Start System
      Tester Connection Switch Condition Specified Condition
      D75-12 (CA3P) - D75-11 (CA3N) Ignition switch off 108 to 132 Ω
      w/o Entry and Start System
      Tester Connection Switch Condition Specified Condition
      D104-4 (CA3P) - D104-3 (CA3N) Ignition switch off 108 to 1324 Ω
      Text in Illustration
      *1 w/ Entry and Start System *3

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *2 w/o Entry and Start System - -

    NG

    REPAIR OR REPLACE POWER MANAGEMENT CONTROL ECU MAIN WIRE OR CONNECTOR (CA3P, CA3N)

    OK

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


    1. 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 D75*1 or D104*2 power management control ECU connector.


      • *1: w/ Entry and Start System

      • *2: w/o Entry and Start System

      A005UEHE02

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

      Standard Resistance
      w/ Entry and Start System
      Tester Connection Condition Specified Condition
      D75-5 (GND2) - Body ground Always Below 1 Ω
      D75-6 (GND) - Body ground Always Below 1 Ω
      w/o Entry and Start System
      Tester Connection Condition Specified Condition
      D104-12 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      w/ Entry and Start System
      Tester Connection Condition Specified Condition
      D75-1 (AM22) - Body ground Always 11 to 14 V
      D75-2 (AM1) - Body ground Always 11 to 14 V
      w/o Entry and Start System
      Tester Connection Switch Condition Specified Condition
      D104-8 (AM21) - Body ground Always 11 to 14 V
      D104-2 (IG2) - Body ground Ignition switch ON 11 to 14 V
      Text in Illustration
      *1 w/ Entry and Start System *3

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *2 w/o Entry and Start System - -

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here