Lexus RX300 (MCU15). Manual — part 242

D10063

Engine & ECT ECU

KD

E10

G–W

3

Kick–down Switch

2

1

W–B

A

J9 J/C

IG

DI–200

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

LEXUS RX300 (RM785E)

Kick–down Switch Circuit (LHD)

CIRCUIT DESCRIPTION

The kick–down switch is turned ON when the accelerator pedal is depressed to the full throttle and sends
signals to Engine & ECT ECU.
When the kick–down switch is turned ON, the Engine & ECT ECU controls gear shifting according to the
programmed shift diagrams.
If a short circuit develops in the kick–down switch, the Engine & ECT ECU disregards the kick–down signals
and controls shifting at the normal shift points.

WIRING DIAGRAM

DI620–03

D05060

ON

KD

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

DI–201

LEXUS RX300 (RM785E)

INSPECTION PROCEDURE

1

Check KICK DOWN SW signal.

When using hannd–held tester:
PREPARATION:
(a)

Remove the DLC3 cover.

(b)

Connect a hand–held tester to the DLC3.

(c)

Turn the ignition switch ON and hand–held tester main
switch ON.

CHECK:
Read the KICK DOWN SW signal on the hand–held tester.
OK:

Accelerator pedal

KICK DOWN

SW signal

Fully depressed (kick–down SW is ON)

ON

Released (kick–down SW is OFF)

OFF

When not using hand–held tester:
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure voltage between terminal KD of Engine & ECT ECU
connector and body ground when accelerator pedal is fully de-
pressed or not.
OK:

Accelerator pedal

Voltage

Fully depressed (kick–down SW is ON)

Below 1 V

Released (kick–down SW is OFF)

10 – 14 V

OK

Proceed to next circuit inspection shown in
problem symproms table (See page DI–160).

NG

D01519

1

2

DI–202

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

LEXUS RX300 (RM785E)

2

Check kick–down switch.

PREPARATION:
Disconnect the kick–down switch connector.
CHECK:
Check continuity at each terminal of kick–down switch connec-
tor.
OK:

Kick–down switch

Specified condition

ON

No continuity

OFF

Continuity

NG

Replace kick–down switch.

OK

3

Check harmess and connector between Engine & ECT ECU and kick–down
switch, kick–down switch and body ground (See page IN–32).

NG

Repair or replace the harness or connector.

OK

Check and replace Engine & ECT ECU
(See page IN–32).

DI0W3–08

Vehicle Brought to Workshop

Customer Problem Analysis

P. DI–204

Check and Clear DTC (Precheck)

P. DI–205

Items inside

are titles of pages in this manual,

with the page number in the bottom portion. See
the pages for detailed explanations.

Problem Symptom Confirmation

Symptom Simulation

P. IN–22

Symptom
does not occur

Symptom
occurs

DTC Check

P. DI–205

Sensor Check

Circuit Inspection

P. DI–222 – DI–300

DTC Chart

P. DI–213

Malfunction code

Problem Symptoms Table

P. DI–220

Check for Fluid Leakage

P. DI–302

Identification of Problem

Normal code

Repair

Confirmation Test

End

1

2

3

4

5

6

7

8

9

10

11

Step 2, 5, 8, 9, 11:

Fail safe function:
When a failure occurs in the ABS & BA & TRC & VSC system, the respective ABS & VSC warning light is lit and
the operation of ABS & BA & TRC & VSC is prohibited. (In addition to this, when the failure which disables the EBD
operation occurs, the brake warning light is lit as well and the EBD operation is prohibited).

Diagnostic steps permitting the use of the
hand–held tester.

–

DIAGNOSTICS

ABS & BA & TRC & VSC SYSTEM

DI–203

LEXUS RX300 (RM785E)

ABS & BA & TRC & VSC SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshoot in accordance with the procedure on the following pages.