Lexus ES300 (2002 year). Manual - part 340

C93266

E2

THO

E1

E2

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-41 1

564

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

INSPECTION PROCEDURE

1

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

(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 ”AT FLUID TEMP” 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

AT FLUID TEMP

ATF Temp. Sensor Value/

min.: -40 



C (-40 



F)

max.: 225 



C (437 



F)

80 



C (176 



F)

(After Stall Test)

If the value is ”-40 



C (-40 



F)” or

”225 



C (437 



F)”, ATF temp. sen-

sor circuit is opened or shorted.

OK

CHECK AND REPLACE ECM(See page 

01-31

)

NG

2

INSPECT TRANSMISSION WIRE(ATF TEMPERATURE SENSOR)

(a)

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

(b)

Measure the resistance between terminals THO and E2.
OK:

Temperature: 



C (



F)

Resistance: k

Ω

10 (50)

6.4

110 (230)

0.2

NG

REPAIR OR REPLACE TRANSMISSION
WIRE(See page 

40-20

)

OK

C82157

C91564

THO

E2

05-412

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

565

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

3

CHECK HARNESS AND CONNECTOR(TRANSMISSION WIRE - ECM)

(a)

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

(b)

Disconnect the ECM connector.

(c)

Measure resistance between terminals THO and E2.
OK:

Temperature: 



C (



F)

Resistance: k

Ω

10 (50)

6.4

110 (230)

0.2

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR(See page 

01-31

)

OK

CHECK AND REPLACE ECM(See page 

01-31

)

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-413

566

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

P0750

SHIFT SOLENOID A MALFUNCTION

DTC

P0755

SHIFT SOLENOID B MALFUNCTION

DTC

P0760

SHIFT SOLENOID C MALFUNCTION

DTC

P0765

SHIFT SOLENOID D MALFUNCTION

DTC

P1815

SR SOLENOID VALVE MALFUNCTIN

SYSTEM DESCRIPTION

The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th
or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
troubles of the shift solenoid valves and valve body.

DTC No.

DTC Detection Condition

Trouble Area

P0750

P0755

P0760

P0765

P1815

During normal driving, gear required by ECM does not match
the actual gear (2 trip detection logic)

Shift solenoid valve SL1, SL2, SL3, S4 or SR is stuck open or
closed

Valve body is blocked or stuck

Torque converter clutch

Automatic transaxle

HINT:

Start the inspection from step 1 when DTC P0750 is output.

Start the inspection from step 1 when DTC P0755 is output.

Start the inspection from step 1 when DTC P0760 is output.

Start the inspection from step 2 when DTC P0765 is output.

Start the inspection from step 2 when DTC P1815 is output.

056EP-01

05-414

-

DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

567

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 ”SHIFT” in the ACTIVE TEST and operate the shift 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

SHIFT

[Test Details]
Operate the shift solenoid valve and set the each shift position by your-
self.
[Vehicle Condition]
Less than 50 km/h (31 mph)
[Others]

Press 

→

 button: Shift up

Press 

←

 button: Shift down

Possible to check the operation of

the shift solenoid values.

A

NG (SL1)

B

NG (SL2)

C

NG (SL3)

NG(A)

Go to step 3

NG(B)

Go to step 4

NG(C)

Go to step 5

OK

CHECK AND REPLACE ECM(See page 

01-31

)