CAN COMMUNICATION SYSTEM 4WD Control ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
4WD Control ECU Communication Stop Mode

  • "Four Wheel Drive Control" is not displayed on the "CAN Bus Check" screen of the GTS.

  • Applies to 4WD Control ECU Communication Stop Mode in the DTC Combination Table.

  • Power source circuit of AWD control ECU

  • AWD control ECU branch line or connector

  • AWD control ECU

WIRING DIAGRAM

A01EK2PE11

INSPECTION PROCEDURE

Note


  • 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 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 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 OPEN IN CAN BUS WIRE (AWD CONTROL ECU BRANCH LINE)


    1. Turn the ignition switch off.

    2. A01EK6DE07
      Text in Illustration
      *1

      Front view of wire harness connector

      (to AWD Control ECU)

      Disconnect the AWD control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D38-14 (CANH) - D38-16 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE AWD CONTROL ECU BRANCH WIRE OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01EK6DE09
      Text in Illustration
      *1

      Front view of wire harness connector

      (to AWD Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D38-11 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A01EK6DE08
      Text in Illustration
      *1

      Front view of wire harness connector

      (to AWD Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D38-23 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL)

    OK

    REPLACE AWD CONTROL ECU Click here