Automatic Transmission System Kick Down Switch Circuit

Transmission. Lexus Is250, Is220D. Gse20 Ale20
A960E Automatic Transmission. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

CHECK HARNESS AND CONNECTOR (KICK DOWN SWITCH - BODY GROUND)

INSPECT KICK DOWN SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (KICK DOWN SWITCH - ECM)

AUTOMATIC TRANSMISSION SYSTEM - Kick Down Switch Circuit


DESCRIPTION

The kick-down switch is turned ON when the accelerator pedal is fully depressed and a signal is sent to the ECM.
When the kick-down switch is turned ON, the ECM controls gear shifting according to the programmed shift diagrams.
If a short circuit develops in the kick-down switch, the ECM disregards the kick-down signals and controls shifting at the normal shift points.

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.A960E Automatic Transmission.Automatic Transmission System.Automatic Transmission System Kick Down Switch Circuit

1.CHECK HARNESS AND CONNECTOR (KICK DOWN SWITCH - BODY GROUND)

  1. Disconnect the kick-down switch connector.



    Lexus Is250, Is220D. Gse20 Ale20.A960E Automatic Transmission.Automatic Transmission System.Automatic Transmission System Kick Down Switch Circuit

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

    Resistance:
    Tester Connection
    		Specified Condition
    1 - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT KICK DOWN SWITCH ASSEMBLY


    Lexus Is250, Is220D. Gse20 Ale20.A960E Automatic Transmission.Automatic Transmission System.Automatic Transmission System Kick Down Switch Circuit

  1. Measure resistance according to the value(s) in the table below when kick-down switch is ON and OFF.

    Resistance:
    Switch Condition
    		Tester Connection
    		Specified Condition
    Press continuously
    (Kick-down switch is ON)
    		1 - 2
    		Below 1 Ω
    Release
    (Kick-down switch is OFF)
    		↑
    		10 kΩ or higher


NG
REPLACE KICK DOWN SWITCH ASSEMBLY
OK


3.CHECK HARNESS AND CONNECTOR (KICK DOWN SWITCH - ECM)


    Lexus Is250, Is220D. Gse20 Ale20.A960E Automatic Transmission.Automatic Transmission System.Automatic Transmission System Kick Down Switch Circuit

  1. Connect the kick-down switch connector.

  1. Disconnect the ECM connector.

  1. Measure resistance according to the value(s) in the table below when accelerator pedal is fully depressed or not.

    Resistance:
    Switch Condition
    		Tester Connection
    		Specified Condition
    Fully depressed
    (Kick-down switch is ON)
    		A5 - 26 (KD) - Body ground
    		Below 1 Ω
    Release
    (Kick-down switch is OFF)
    		↑
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE