Lexus ES300 (2002 year). Manual - part 333

C93638

Passenger Side J/B

3B

3B

3B

3B

(*1)

3B

3B

3B

3B

3B

3B

3B

3B

3B

3B

3B

3B

3A

3A

3A

3A

3B

3B

3B

3B

3A

(*2)

130

110

124

104

(*1)

(*2)

120

100

(*1)

(*2)

94

(*1)

(*2)

121

101

(*1)

(*2)

111

91

(*1)

(*2)

123

103

(*1)

(*2)

119

99

110

(*1)

(*2)

94

74

(*1)

(*2)

101

81

107

87

(*1)

(*2)

103

83

90

to 
Combination
Meter

L-B

Y

W

W-L

2

IK1

L-W

W

Y-B

W-L

8

9

E7

E7

E7

E7

10

20

L

2

D

3

ECM

Driver Side J/B

GAUGE2

2

5

1

3

IG1 Relay

ALT

*1: W/ VSC
*2: W/O VSC

W-B

3B

3B

(*1)

(*2)

104

84

E7

E7

23

11

4

R

R-B

W

IL1

21

IL1

20

3B

3B

(*1)

(*2)

100

80

3A

114

3B

3B

(*1)

(*2)

63

43

3B

3B

(*1)

(*2)

97

77

3A

104

3B

3B

(*1)

(*2)

127

107

3B

3B

(*1)

(*2)

109

89

T8
Transmission Control SW

W

L-B

MTL

MT2

4

5

3 MTD

2 MT4

NSSL

Y

6

W-L

1

NSSD

W

Y-B

W
W
W
W

A4
A/T Indicator 
Light SW

G-W

19

IL1

R

PL 1

RL 2

NL 5

3 RB

IL1

22

Battery

FL MAIN

B-G

Engine Room R/B

IA

W
W

5

2L

2

2E

8

2R

AM1

5

2R

6

2B

8

2A

2

2A

DL

7

W-L

L-W

Y

2L

4

LL

8

2

IL2

3

IL2

R-L

I14
Ignition SW

R-L

R-B

B-Y

W

AM1 IG1

2

4

18 IL1

1

1

1

2

B-G

W

(*1)

(*2)

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-451

604

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

WIRING DIAGRAM

05-452

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

605

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

INSPECTION PROCEDURE

1

READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER

(a)

Warm up the engine.

(b)

Turn the ignition switch OFF.

(c)

Connect the OBD II scan tool or Hand-held tester to the DLC3.

(d)

Turn the ignition switch ON and push the OBD II scan tool or Hand-held tester main SW ON.

(e)

Shift the shift lever to the R, D, 4, 3, 2 and L positions, select the item ”REVERSE”, ”5TH/DRIVE”,
”4TH”, ”3RD”, ”2ND” and ”LOW” in the DATALIST and read its value displayed on the OBD II scan tool
or Hand-held tester.

NOTICE:
The values given below for ”Normal Condition” are representative values, so a vehicle may still be
normal even if its value differs from those listed here. Do not depend solely on the ”Normal Condi-
tion” here when deciding whether or not the part is faulty.

Item

Measurement Item/

Display (Range)

Normal Condition

Diagnostic Note

REVERSE

PNP SW Status/

ON or OFF

Shift lever position is;
R: ON
Except R: OFF

5TH/DRIVE

PNP SW Status/

ON or OFF

Shift lever position is;
D and 4: ON
Except D and 4: OFF

4th

PNP SW Status/

ON or OFF

Shift lever position is;
4: ON
Except 4: OFF

The shift lever position and these

values are different, there are fail-

3rd

PNP SW Status/

ON or OFF

Shift lever position is;
3: ON
Except 3: OFF

values are different, there are fail

ures of the PNP switch or shift

cable adjustment.

2ND

PNP SW Status/

ON or OFF

Shift lever position is;
2 and L: ON
Except 2 and L: OFF

LOW

PNP SW Status/

ON or OFF

Shift lever position is;
L: ON
Except L: OFF

OK

CHECK AND REPLACE ECM(See page 

01-31

)

NG

C53270

C92350

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-453

606

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

2

INSPECT PARK/NEUTRAL POSITION SWITCH ASSY

(a)

Disconnect the park/neutral position switch connector.

(b)

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

Shift Position

Terminal No. to continuity

P

1 - 3

6 - 9

R

2 - 3

-

N

3 - 5

6 - 9

D, 4

3 - 7

-

3

3 - 4

-

2, L

3 - 8

-

OK:
There is continuity.

NG

REPLACE PARK/NEUTRAL POSITION SWITCH
ASSY(See page 

40-3

)

OK

3

INSPECT SHIFT LOCK CONTROL UNIT ASSY

(a)

Connect the park/neutral position switch connector.

(b)

Disconnect the transmission control switch connector.

(c)

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

Shift Position

Terminal No. to continuity

P

4 - 6

1 - 3

R

4 - 6

1 - 3

N

4 - 6

1 - 3

D

4 - 6

1 - 3

4

4 - 6

1 - 2

3

4 - 6

1 - 2

2

4 - 6

1 - 3

L

5 - 6

1 - 3

OK:
There is continuity.

NG

REPLACE SHIFT LOCK CONTROL UNIT ASSY

OK

C82160

C91567

2

R

L

D

3

4

E1

05-454

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

607

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

4

CHECK HARNESS AND CONNECTOR(PARK/NEUTRAL POSITION SWITCH -
ECM)

(a)

Connect the transmission control switch connector.

(b)

Disconnect the ECM connector.

(c)

Turn the IG switch ON and measure the voltage between
terminals R, D, 4, 3, 2, and L of ECM and the E1 when the
shift lever is shifted to the following position.
OK:

Shift position

Terminal

Voltage (V)

R

R - E1

10 - 14

D, 4

D - E1

10 - 14

4

4 - E1

10 - 14

3

3 - E1

10 - 14

2, L

2 - E1

10 - 14

L

L - E1

10 - 14

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR(See page 

01-31

)

OK

CHECK AND REPLACE ECM(See page 

01-31

)