AUTOMATIC TRANSMISSION SYSTEM Pattern Select Switch Snow Mode Circuit

DESCRIPTION

The pattern select switch makes it possible to select Normal or SNOW modes.

The cowl side junction block ECU (main body ECU RH) receives pattern select switch information, and sends it through the multiplex communication system and CAN system to each ECU.

When SNOW is selected, the operation of the throttle motor is moderated to control engine output. This helps to reduce skidding of the drive wheels, and assists with takeoff acceleration, driving straightness and turning stability.

WIRING DIAGRAM

A015ZL1E01

Tech Tips


  • (*1) Pattern Select Switch (SNOW Switch)

    When the SNOW switch is pushed, the switch contact is made and the SNOW mode is selected.

    To cancel the SNOW mode, push the SNOW switch once again.

    The SNOW mode is automatically cancelled when the engine switch is turned off.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSEMBLY - BODY GROUND)


    1. Disconnect the connector of pattern select switch Click here.

    2. A015ZPJE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Pattern Select Switch)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J36-5 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT PATTERN SELECT SWITCH ASSEMBLY


    1. A016274E02
      Text in Illustration
      *1

      Component without harness connected

      (Pattern Select Switch)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5 (E) - 4 (2ND)

      Press continuously pattern select switch

      (SNOW)

      		 Below 1 Ω

      Release pattern select switch

      (SNOW)

      		 10 kΩ or higher

    NG

    REPLACE PATTERN SELECT SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSEMBLY - MAIN BODY ECU)


    1. A0161UME26
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Main Body ECU RH)

      Connect the connector of pattern select switch.

    2. Disconnect the cowl side junction block (main body ECU RH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J75-17 (SNOW) - Body ground

      Press continuously pattern select switch

      (SNOW)

      		 Below 1 Ω

      Release pattern select switch

      (SNOW)

      		 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here