AUTOMATIC TRANSMISSION SYSTEM (for 1UR-FE) Pattern Select Switch 2nd Start Mode Circuit

DESCRIPTION

When 2nd mode is selected with the No. 1 pattern select switch assembly, the ECM controls the shift solenoid valves and the transmission starts from 2nd gear.

The 2nd 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

Refer to Pattern Select Switch Power Mode Circuit Click here.

INSPECTION PROCEDURE

When the pattern select switch (2ND) is pushed, switch contact is made and 2nd mode is selected. To cancel 2nd mode, push the pattern select switch (2ND) once again.

Tech Tips

2nd 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 2ND switch off (normal drive mode).

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

    4. Turn the 2ND switch on and perform the same check as above.

      When driving the vehicle with the 2ND switch on and off, check that there is a difference in acceleration.

      OK
      There is a difference in acceleration.

    NG

    INSPECT NO. 1 PATTERN SELECT SWITCH ASSEMBLY (2ND) Click here

    OK

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

  2. INSPECT NO. 1 PATTERN SELECT SWITCH ASSEMBLY (2ND)


    1. A01EQVDE02
      Text in Illustration
      *a

      Component without harness connected

      (No. 1 Pattern Select Switch Assembly)

      Remove the No. 1 pattern select switch assembly Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (2ND) - 3 (E) Pattern select switch (2ND) and held pressed Below 1 Ω
      2 (2ND) - 3 (E) Pattern select switch (2ND) released 10 kΩ or higher

    NG

    REPLACE NO. 1 PATTERN SELECT SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 1 PATTERN SELECT SWITCH ASSEMBLY - BODY GROUND)


    1. A01EN4ME01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 1 Pattern Select Switch Assembly)

      Disconnect the No. 1 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
      V5-3 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (NO. 1 PATTERN SELECT SWITCH ASSEMBLY - ECM)

    A01ERA7E70
    Text in Illustration
    *a

    Front view of wire harness connector

    (to ECM)

    1. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A53-4 (SNWI) - Body ground Pattern select switch (2ND) pressed and held Below 1 Ω
      A53-4 (SNWI) - Body ground Pattern select switch (2ND) released 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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