SFI SYSTEM Pattern Select Switch Snow Mode Circuit

DESCRIPTION

When SNOW mode 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

A002AYOE07
*a SNWI
*b Pattern Select Switch Assembly (SNOW Mode Switch)

PROCEDURE


  1. READ VALUE USING GTS (SNOW OR 2ND START MODE)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Snow or 2nd Start Mode.


      Powertrain > Engine > Data List
      Tester Display
      Snow or 2nd Start Mode

    4. Read the value displayed on the GTS.

      OK
      Condition GTS Display (Snow or 2nd Start Mode)
      SNOW mode on ON
      SNOW mode off OFF
      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. INSPECT PATTERN SELECT SWITCH ASSEMBLY (SNOW MODE SWITCH)


    1. Inspect the pattern select switch assembly (SNOW mode switch).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PATTERN SELECT SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (ECM - PATTERN SELECT SWITCH ASSEMBLY)


    1. Disconnect the pattern select switch assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A43-18 (SNWI) - F42-8 Always Below 1 Ω
      A43-18 (SNWI) or F42-8 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the pattern select switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F42-5 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR