AUTOMATIC TRANSMISSION SYSTEM (for 3UR-FE) L4 Position Switch Circuit

DESCRIPTION

The four wheel drive control ECU judges whether the transfer is in the L4 position based on the information from the limit switch inside the transfer shift actuator assembly which is detected by the ECM. The four wheel drive control ECU then inputs a signal to the combination meter assembly via CAN communication and turns on the 4LO indicator.

WIRING DIAGRAM

Refer to DTC P2772 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - BODY GROUND)


    1. A01EPE7E19
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Four Wheel Drive Control)

      Disconnect the four wheel drive control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-21 (L4) - Body ground Always 10 kΩ or higher

    NG

    CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - ECM) Click here

    OK

    GO TO TRANSFER SYSTEM INSPECTION Click here

  2. CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - ECM)


    1. A01ERACE09
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Disconnect the A27 four wheel drive control ECU connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A38-21 (L4) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A53-21 (L4) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here