Lexus ES300 (1997 year). Manual - part 433

AB0119
N19917

I00742

ON

(–)

(+)

O/D

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

DI–509

661

1997 LEXUS ES300   (RM511U)

INSPECTION PROCEDURE

1

Check operation of overdrive.

PREPARATION:
Test drive after engine warms up.
CHECK:
Check that overdrive ON 

↔

 OFF occurs with operation of OD switch ON–OFF.

NG

Check and repair electronically controlled
transmission.

OK

2

Check voltage between terminal OD of harness side connector of cruise control
ECU and body ground.

PREPARATION:
(a)

Remove the ECU with connector still connected.

(b)

Turn ignition switch ON.

(c)

Disconnect the ECU connector.

CHECK:
Measure voltage between terminal OD of harness side connec-
tor of ECU and body ground.
OK:

Voltage: 10 – 14 V

NG

Go to step 5.

OK

N19918

ECT

(–)

(+)

DI–510

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

662

1997 LEXUS ES300   (RM511U)

3

Check voltage between terminal ECT of cruise control ECU connector and body
ground (On test drive).

PREPARATION:
(a)

Connect the ECU connector.

(b)

Test drive after engine warms up.

CHECK:
Check voltage between terminal ECT of ECU connector and
body ground when OD switch is ON and OFF.
OK:

OD switch position

Voltage

ON

8 – 14 V

OFF

Below 0.5 V

OK

Proceed to next circuit inspection shown on
problem symptom table (See page 

DI–487

).

NG

4

Check harness and connector between terminal ECT of cruise control ECU and
electronically controlled transmission solenoid (See page 

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace cruise control ECU.

5

Check harness and connector between terminal OD of cruise control ECU and
terminal OD1 of ECM (See page 

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace cruise control ECU 
(See page 

IN–27

).

N21222

Park/Neutral
Position Switch

Cruise Control ECU

Junction Connector

Instrument Panel J/B

ALT

B–R

I13

B–G

R–L

Ignition Switch

W

1K

AM1

B–Y

J28

C14

IK2

Battery

FL MAIN

GAUGE

IG1

Junction
Connector

IK2

AM1

1K

J29

F6

F11

1

1

1

2

2

1

2

4

1K

1J

1

1

2

A

A

2

10

9

A

A

3

D

R–L

B–R

B–R

B–R

R–L

R–L

Instrument Panel J/B

Junction
Connector

F

D

D

J30

P1

J25

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

DI–511

663

1997 LEXUS ES300   (RM511U)

Park/Neutral Position Switch Circuit

CIRCUIT DESCRIPTION

When the shift position is put in except D position, a signal is sent from the park/neutral position switch to
the ECU. When this signal is input during cruise control driving, the ECU cancels the cruise control.

WIRING DIAGRAM

DI0F4–01

Input Signal

Indicator Light 
Blinking Pattern

Turn PNP switch
OFF (Shift to 
except D position)

Light

ON

OFF

SW ON

SW OFF

DI–512

–

DIAGNOSTICS

CRUISE CONTROL SYSTEM

664

1997 LEXUS ES300   (RM511U)

INSPECTION PROCEDURE

1

Check starter operation.

CHECK:
Check that the starter operates normally and that the engine starts.

NG

Proceed to engine troubleshooting.
(See page 

ST–1

).

OK

2

Input signal check.

PREPARATION:
See input signal check on page 

DI–478

.

CHECK:
Check the indicator light when shifting into except D position.
OK:

The indicator light goes off when shifting into except
D position.

OK

Proceed to next circuit inspection shown on
problem symptom table (See page 

DI–487

).

NG