Lexus IS250 IS220d GSE20 ALE20 - A960E AUTOMATIC TRANSMISSION
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
| 1.CHECK HARNESS AND CONNECTOR (KICK DOWN SWITCH - BODY GROUND) |
Disconnect the kick-down switch connector.
Measure the resistance according to the value(s) in the table below.
- Resistance:
| Tester Connection | Specified Condition |
| 1 - Body ground | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 2.INSPECT KICK DOWN SWITCH ASSEMBLY |
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 |
| | REPLACE KICK DOWN SWITCH ASSEMBLY |
|
|
| 3.CHECK HARNESS AND CONNECTOR (KICK DOWN SWITCH - ECM) |
Connect the kick-down switch connector.
Disconnect the ECM connector.
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 |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
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LEXUS IS250, IS220d / GSE20 ALE20
