AUTOMATIC TRANSMISSION SYSTEM Pattern Select Switch Snow Mode Circuit

DESCRIPTION

When snow mode is selected with the combination switch (SNOW), the ECM controls the solenoid valves and the transmission starts from 2nd gear.

The snow mode is the system that operates the throttle motor to control engine output to reduce skidding of the driving wheels, and guarantee takeoff acceleration, driving straightness and turning stability.

When the shift lever is in D, the transmission automatically shifts up through 3rd to 6th as usual.

WIRING DIAGRAM

A01FHHUE03

INSPECTION PROCEDURE

When the combination switch (SNOW) is pushed, switch contact is made and snow mode is selected. To cancel snow mode, push the combination switch (SNOW) once again.

Tech Tips

Snow mode is automatically canceled when the engine switch is turned off.

PROCEDURE


  1. DRIVING TEST

    Tech Tips

    The driving test should be performed on a paved road (nonskid road).


    1. Start the engine.

    2. Turn the SNOW switch off (normal drive mode).

    3. Confirm vehicle response by driving from a parked position to fully depressing the accelerator pedal.

    4. Turn the SNOW switch on and perform the same check as above.

      When driving the vehicle with the SNOW switch on and off, check that there is a difference in acceleration.

      OK
      There is a difference in acceleration.

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - BODY GROUND) Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - BODY GROUND)


    1. Disconnect the connector of combination switch.

    2. A01FIU2E37
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Switch Assembly)

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

      Standard resistance
      Tester Connection Specified Condition
      N59-4 (GND) - Body ground Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT COMBINATION SWITCH ASSEMBLY


    1. A01FI2OE01
      Text in Illustration
      *1

      Component without harness connected

      (Combination Switch Assembly)

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      2 - 4

      Press continuously combination switch

      (SNOW)

      		 Below 10 Ω
      ↑

      Release combination switch

      (SNOW)

      		 10 kΩ or higher

    NG

    REPLACE COMBINATION SWITCH ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (COMBINATION SWITCH ASSEMBLY - ECM)


    1. A01FFM4E05
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to ECM)

      Connect the connector of combination switch.

    2. Disconnect the ECM connector.

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      A21-22 (SNWI) - Body ground

      Press continuously combination switch

      (SNOW)

      		 Below 10 Ω
      ↑

      Release combination switch

      (SNOW)

      		 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here