Lexus ES300 (2002 year). Service manual - part 328

C90645

Air

(-)

(+)

(-)

(+)

C90646

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-431

584

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

4

INSPECT SHIFT SOLENOID VALVE DSL

(a)

Remove the shift solenoid valve DSL.

(b)

Applying 490 kPa (5 kgf/cm

2

, 71 psi) of compressed air,

check that the solenoid valve does not leak the air.
OK:
Solenoid valve does not leak air.

(c)

When battery voltage is supplied to the shift solenoid
valve, check that the valve opens.
OK:
Solenoid valve opens.

(d)

Measure the resistance between the terminal DSL of shift
solenoid valve and the solenoid body.
OK:
Resistance: 11 - 13 

Ω

 at 20 



C (68 



F)

(e)

Connect positive (+) lead to the terminal of solenoid con-
nector, negative (-) lead to the solenoid body.
OK:
The solenoid valve makes an operationing noise.

NG

REPLACE SHIFT SOLENOID VALVE DSL

OK

5

CHECK TRANSMISSION WIRE

(See page 

01-31

)

NG

REPAIR OR REPLACE TRANSMISSION
WIRE(See page 

40-20

)

OK

6

INSPECT TRANSMISSION VALVE BODY ASSY

NG

REPAIR OR REPLACE TRANSMISSION VALVE
BODY ASSY(See page 

40-23

)

OK

05-432

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

585

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

7

INSPECT TORQUE CONVERTER CLUTCH ASSY(See page 

40-16

)

NG

REPLACE TORQUE CONVERTER CLUTCH
ASSY

OK

REPAIR AUTOMATIC TRANSAXLE ASSY

(See page 

40-8

)

C93633

Electronically Controlled
Transmission Solenoid

Y

E9

DSL

ECM

11

W-BR

DSL

E1

2

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-433

586

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

P0773

SHIFT SOLENOID E ELECTRICAL
MALFUNCTION

CIRCUIT DESCRIPTION

The shift solenoid valve DSL is turned ON and OFF by signals from the ECM in order to control the hydraulic
pressure operation the lock-up relay valve, which then the controls operation of the lock-up clutch.

DTC No.

DTC Detection Condition

Trouble Area

P0773

Either (a) or (b) is detected at 1 time:
(2 trip detection logic)

(a) Solenoid resistance is 8 

Ω

 or less short circuit when sole-

noid is energized

(b) Solenoid resistance is 100

 

k

Ω

 or more open circuit when

solenoid is not energized

Open or short in shift solenoid valve DSL circuit

Shift solenoid valve DSL

ECM

Fail safe function: 
If the ECM detects a malfunction, it turns the shift solenoid valve DSL OFF.

WIRING DIAGRAM

0527R-04

C93266

E1

E2

DSL

05-434

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

587

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

INSPECTION PROCEDURE

1

PERFORM ACTIVE TEST BY 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)

Select the item ”LOCK UP” in the ACTIVE TEST and operate the Lock-up solenoid valves 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

Test Details

Diagnostic Note

LOCK UP

[Test Details]
Control the shift solenoid DSL to set the ATM to the lock-up condition.
[Vehicle Condition]
Vehicle Speed: 58 km/h (36 mph) or more

Possible to check the DSL opera-

tion.

OK

CHECK AND REPLACE ECM(See page 

01-31

)

NG

2

INSPECT TRANSMISSION WIRE(DSL)

(a)

Disconnect the transmission wire connector (E1) from the
transaxle.

(b)

Measure resistance between the terminal DSL and body
ground.
OK:
Resistance: 11 - 13

 Ω

 at 20 



C (68 



F)

NG

Go to step 4

OK