Lexus ES300 (2002 year). Manual - part 342

C90640

(+)

(-)

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-419

572

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

7

INSPECT SHIFT SOLENOID VALVE SR

(a)

Remove the shift solenoid valve SR.

(b)

Measure the resistance between the solenoid connector
and the solenoid body.
OK:
Resistance: 11 - 15 

Ω

 at 20

°

C (68

°

F)

(c)

Connector positive (+) lead to the terminal of solenoid
connector, negative (-) lead to the solenoid body.
OK:
The solenoid makes an operating noise.

OK

Go to step 8

NG

REPLACE SHIFT SOLENOID VALVE SR

8

INSPECT TRANSMISSION VALVE BODY ASSY

NG

REPAIR OR REPLACE TRANSMISSION VALVE
BODY ASSY(See page 

40-23

)

OK

9

INSPECT TORQUE CONVERTER CLUTCH ASSY(See page 

40-16

)

NG

REPLACE TORQUE CONVERTER CLUTCH
ASSY

OK

REPAIR AUTOMATIC TRANSAXLE ASSY(See page 

40-8

 )

056A4-01

05-190

-

DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

343

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

ELECTRONIC MODULATED SUSPENSION SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

1

VEHICLE BROUGHT TO WORKSHOP

2

CUSTOMER PROBLEM ANALYSIS(See page 

05-192

)

3

CHECK AND CLEAR DTCS(See page 

05-193

)

4

PROBLEM SYMPTOM CONFIRMATION

SYMPTOM DOES NOT OCCUR(Go to step 5)

SYMPTOM OCCUR(Go to step 6)

5

SYMPTOM SIMULATION(See page 

01-21

)

6

DTC CHECK(See page 

05-193

)

NORMAL CODE(Go to step 7)

MALFUNCTION CODE(Go to step 8)

7

PROBLEM SYMPTOMS TABLE(See page 

05-204

)

8

DTC CHART(See page 

05-200

)

9

CIRCUIT INSPECTION(See page 

05-205

 to 

05-234

)

10

IDENTIFICATION OF PROBLEM

-

DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

05-191

344

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

11

REPAIR

12

CONFIRMATION TEST

END

HINT:
Step 3, 6, 9, 12:
Diagnostic steps permitting the use of the hand-held tester.

F41649

Absorber Control ECU

Driver Side J/B

+B

GND

A22

1

14

B-R

2F

9

FAN RLY

IG1

3

5

AM1

2R

8

2

1

2

2E

2A

Relay

2A

2

8

A22

W-B

ED

IA

W-B

B-G

W

B-Y

4

2

I14 
Ignition SW

Engine Room R/B

FL MAIN

IG1

AM1

ALT

B-G

1

1

1

2

B-G

Battery

05-214

-

DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

367

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

C1774/74 POWER SOURCE CIRCUIT

CIRCUIT DESCRIPTION

When turning the ignition switch to ON, the battery positive voltage is input to +B terminal to absorber control
ECU. When turning the ignition switch to OFF, the battery positive voltage supply to +B terminal stops and
the power switched OFF.

DTC No.

DTC Detecting Condition

Trouble Area

C1774/74

The terminal +B voltage is detected being below or above a
constant voltage for 5 seconds.

Battery

Power source circuit

Absorber control ECU

WIRING DIAGRAM

056AC-01