Lexus ES300 (2002 year). Manual — part 325

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DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

539

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

19

Identification of Problem

20

Repair

21

Confirmation Test

End

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DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

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2002 LEXUS ES300 REPAIR MANUAL (RM911U)

DTC

P0753

SHIFT SOLENOID A ELECTRICAL
MALFUNCTION

DTC

P0758

SHIFT SOLENOID B ELECTRICAL
MALFUNCTION

DTC

P0763

SHIFT SOLENOID C ELECTRICAL
MALFUNCTION

DTC

P0768

SHIFT SOLENOID D ELECTRICAL
MALFUNCTION

DTC

P1818

SR SOLENOID VALVE ELECTRICAL
MALFUNCTION

CIRCUIT DESCRIPTION

Shifting from 1st to 5th is performed in combination with ON and OFF operation of the shift solenoid valves
SL1, SL2, SL3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in either of the
shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be
operated smoothly (Fail safe function).

DTC No.

DTC Detection Condition

Trouble Area

P0753

P0758

P0763

ECM checks for an open or short circuit in shift solenoid valves
SL1, SL2 and SL3:

(a) When solenoid is energized, duty ratio exceed 75 %

(b) When solenoid is not energized, duty ratio is less than 3 %

P0768

P1818

ECM checks for an open or short circuit in shift solenoid valves
S4 and SR circuit when it changes
ECM records DTC P0768 and P1818 if condition (a) or (b) is
detected:

(a) When solenoid is energized, solenoid resistance is 8

Ω

or

less and it is counted

(b) When solenoid is not energized, solenoid resistance is 100

k

Ω

or more and it is counted

Open or short in shift solenoid valve SL1, SL2, SL3, S4 or SR
circuit

Shift solenoid valve SL1, SL2, SL3, S4 or SR

ECM

HINT:
Check the shift solenoid valve SL1 when DTC P0753 is output, check the shift solenoid valve SL2 when DTC
P0758 is output, check the shift solenoid valve SL3 when DTC P0763 is output, check the shift solenoid valve
S4 when DTC P0768 is output and check the shift solenoid valve SR when DTC P1818 is output.

056EQ-01

: ON

: Lock-up ON

: OFF

Normal

Solenoid
Valve

SL1
SL2
SL3
S4

Gear Position

2nd

3rd

4th

5th

1st

SL1
SL2
SL3
S4

Solenoid
Valve

Gear Position

2nd

3rd 2nd 4th 2nd 5th 2nd

1st 2nd

SL1 Malfunction
(During driving at 1st
or 2nd)

SL1
SL2
SL3
S4

Solenoid
Valve

Gear Position

3rd 4th

5th 4th

1st 4th

SL1 Malfunction
(During driving at 3rd)

2nd 4th

4th

SL1
SL2
SL3
S4

Solenoid
Valve

Gear Position

3rd 4th

5th 4th

1st 4th

SL1 Malfunction
(During driving at 4th
or 5th)

2nd 4th

4th

SL1
SL2
SL3
S4

Solenoid
Valve

Gear Position

3rd 4th

5th 4th

1st 4th

SL2 Malfunction

2nd 4th

4th

Solenoid
Valve

SL1
SL2
SL3
S4

Gear Position

2nd

3rd

4th

1st

5th 4th

SL3 Malfunction

Solenoid
Valve

SL1
SL2
SL3
S4

Gear Position

2nd

3rd

4th

1st

5th 4th

SL1
SL2
SL3
S4

Solenoid
Valve

Gear Position

3rd 4th

5th 4th

1st 4th

SL1, SL2, SL3, and S4
Malfunction

2nd 4th

4th

SL4 Malfunction

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DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

05-421

574

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

Fail safe function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid
ON and OFF in order to shift into the gear positions shown in the table below.
Manual shifting as shown in the following table must be done (In case of a short circuit, the ECM stops send-
ing the current to the short circuit solenoid).

C93632

G-B

L

4

G-R

R-B

E2

ECM

Electronically controlled
Transmission Soleniod

SL1+

SL2-

SL2+

SL1-

SL3-

SL3+

S4

SR

8

E2

3

E2

7

E2

2

E2

6

E2

3

E1

6

E1

B-W

L-R

GR

L-Y

E9

19

E9

18

E9

17

E9

16

E9

15

E9

14

E9

13

E9

12

SL1+

SL2-

SL2+

SL1-

SL3-

SL3+

S4

SR

W

B

W-L

R

Y

W-B

L

BR

05-422

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DIAGNOSTICS

ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]

575

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

WIRING DIAGRAM