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

DESCRIPTION

The four wheel drive control ECU judges whether the transfer is in L4 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 inputs a signal to the combination meter assembly via CAN communication and turns on the 4LO indicator when the transfer is in L4.

WIRING DIAGRAM

A01X3ZFE25
*a NP
*b Four Wheel Drive Control ECU
*c TFN
*d Transfer Shift Actuator Assembly

PROCEDURE


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


    1. A01X735E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Four Wheel Drive control ECU)

      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

    OK

    GO TO TRANSFER SYSTEM (INSPECTION) Click here

    NG

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


    1. A01X9M3E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the A38 ECM connector.

    2. Disconnect the four wheel drive control ECU connector.

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

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

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR