Lexus ES300 (1997 year). Manual — part 338

D00107

C8

C8

C8

II2

ID4

ID4

ID1

Combination Meter

ECM

Ignition Switch

Battery

Starter

Security ECU

E7

E7

E7

L

2

R

B+

NSW

14

J29

B

B

B–W

R–B

R–B

J27

J28

J27

Y

O

R–B

IG3

16

13

J29

D

D

D

1

10

15

L–W

Y

J29

E

E

E

Y

Y

4

3

8

5

6

2

Park/Neutral
Position Switch

J24

1H

1V

10

5

5

6

3

11

10

2

J8

J7

C

B

*1

*1

2J

2B

2D

2K

IG2

IF

F9

F9

F4

F6

AL

T

4

2

W

1K

1K

1B

1J

AM1

GAUGE

R–L

R–B

R–B

1

J28

1

R–L

R–L

R–L

A

A

1

S

T

Relay

1

2

1

1

G–B

FL

MAIN

*1: TMC Made

→

GR, TMM Made

→

B–O

B

1

2

3

11

1

2

3

5

L

R

2

6

11

8

C

A

C

R–B

O

Y

F

F

J26

II2

II2

B–W

B–W

B–W

B

B

R–B

IG3

E10

Instrument
Panel J/B

Instrument
Panel J/B

Junction
Connector

Junction
Connector

Junction
Connector

Junction
Connector

Junction
Connector

Fusible
Link Block

Engine Room
J/B

Junction
Connector

5

9

–

DIAGNOSTICS

ENGINE

DI–129

281

1997 LEXUS ES300 (RM511U)

WIRING DIAGRAM

BE3840

D00052

D00042

ON

NSW

L

2

R

Position

P,N

R

D

2

L

NSW–Body
ground

R–Body
ground

2–Body
ground

L–Body
ground

0 V

0 V

0 V

0 V

0 V

0 V

0 V

0 V

0 V

0 V

0 V

0 V

0 V

9

∼

14 V*

9

∼

14 V

9

∼

14 V

9

∼

14 V

9

∼

14 V

9

∼

14 V

9

∼

14 V*

DI–130

–

DIAGNOSTICS

ENGINE

282

1997 LEXUS ES300 (RM511U)

INSPECTION PROCEDURE

1

Read PNP, REVERSE, 2ND and LOW signals.

When using LEXUS hand–held tester.
PREPARATION:
(a)

Connect the LEXUS hand–held tester to the DLC3.

(b)

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

CHECK:
Shift lever into the P, R, N, 2 and L positions, and read the PNP,
REVERSE, 2ND and LOW signals on the LEXUS hand–held
tester.
OK:

Shift position

Signal

2

2ND OFF

→

ON

L

LOW OFF

→

ON

R

REVERSE OFF

→

ON

P,N

NSW OFF

→

ON

When not using LEXUS hand–held tester.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure voltage between terminals NSW, 2, L and R of ECM
and body ground when the shift lever is shifted to the following
positions.
OK:

HINT: The voltage will drop slightly due to lighting up of the back
up light.

OK

Proceed to next circuit inspection shown on
matrix chart. (See page

DI–164

).

NG

Q07657

–

DIAGNOSTICS

ENGINE

DI–131

283

1997 LEXUS ES300 (RM511U)

2

Check park/neutral position switch.

PREPARATION:
(a)

Jack up the vehicle.

(b)

Remove the park/neutral position switch.

CHECK:
Check continuity between each terminal shown below when the
shift lever is moved to each position.

Shift Position

Terminal No. to continuity

P

2 – 7

5 – 6

R

2 – 8

–

N

2 – 9

5 – 6

D

2 – 10

–

2

2 – 3

–

L

2 – 4

–

OK:

There is continuity.

NG

Replace park/neutral position switch.

OK

3

Check harness and connector between battery and park/neutral position switch,
park/neutral position switch and ECM (See page

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace ECM (See page

IN–27

).

S07278

From Ignition
Switch

Instrument Panel
J/B

To Theft Deterrent
ECU

GR

J unc t ino n
Connector

ST

AR

TER

J26 Junction
Connector

From Battery

ECM

Engine Room J/B

MAIN

P a r k / N e u t r a l
Position Switch

GR

W–B

B–R

W–B

Starter

B

B

5

11

B–W

10

B

B

C

11

5

3

2

1

9

5

6

3

4

1

3

1

8

B–W

B–W

GR

1J

1K

IK2

IK2

J9

J8

2K

2B

2D

2J

S1

IG2

IK2

E10

ST Relay

GR

GR

GR

E1

STA

J8

13

DI–132

–

DIAGNOSTICS

ENGINE

284

1997 LEXUS ES300 (RM511U)

Starter Signal Circuit

CIRCUIT DESCRIPTION

When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after–start injection control.

WIRING DIAGRAM

DI0A7–01