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Lexus ES300 (1997 year). Manual - part 646

178

ELECTRONICALLY CONTROLLED TRANSMISSION

IK2

IL1

IK3

IK2

IJ1

L–W

R–B

R–L

W–B

L–W

B–

R–

G–

L–

B–

L–W

B–

R–

G–

W–

COMBINATION METER

C 8

, C 9

, C10

JUNCTION
CONNECTOR

J16

P 1

NCT

UNC

NNE

L–W

B–

R–

G–

W–B

R–B

L–W

R–L

G–

UNCT

NNE

A/T INDICATOR LIGHT SW
[PARK/NEUTRAL POSITION SW]

179

AND A/T INDICATOR

PREVIOUS AUTOMATIC TRANSAXLE HAVE SELECTED EACH GEAR SHIFT USING THE MECHANICALLY CONTROLLED THROTTLE
HYDRAULIC PRESSURE, GOVERNOR HYDRAULIC PRESSURE AND LOCK–UP HYDRAULIC PRESSURE. THE ELECTRONICALLY
CONTROLLED TRANSMISSION HOWEVER, ELECTRICALLY CONTROLS THE LINE PRESSURE AND LOCK–UP PRESSURE ETC.,
THROUGH THE SOLENOID VALVE. ENGINE CONTROL MODULE CONTROL OF THE SOLENOID VALVE BASED ON THE INPUT
SIGNAL FROM EACH SENSOR MAKES SMOOTH DRIVING POSSIBLE BY SHIFT SELECTION FOR EACH GEAR WHICH IS MOST
APPROPRIATE TO THE DRIVING CONDITIONS AT THAT TIME.

1. GEAR SHIFT OPERATION

DURING DRIVING, THE ENGINE CONTROL MODULE SELECTS THE SHIFT FOR EACH GEAR WHICH IS MOST APPROPRIATE TO THE
DRIVING CONDITIONS, BASED ON INPUT SIGNALS FROM THE ENGINE COOLANT TEMP. SENSOR TO TERMINAL THW OF THE
ENGINE CONTROL MODULE, AND ALSO THE INPUT SIGNALS TO TERMINAL NC2+ OF THE ENGINE CONTROL MODULE FROM THE
VEHICLE SPEED SENSOR DEVOTED TO THE ELECTRONICALLY CONTROLLED TRANSMISSION. CURRENT IS THEN OUTPUT TO
THE ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID. WHEN SHIFTING TO 1ST SPEED, CURRENT FLOWS FROM
TERMINAL S1 OF THE ENGINE CONTROL MODULE

→

TERMINAL 3 OF THE ELECTRONICALLY CONTROLLED TRANSMISSION

SOLENOID

→

GROUND, AND CONTINUITY TO THE NO. 1 SOLENOID CAUSES THE SHIFT.

FOR THE 2ND SPEED, CURRENT FLOWS FROM TERMINAL S OF THE ENGINE CONTROL MODULE

→

TERMINAL 3 OF THE

ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID

→

GROUND, AND FROM TERMINAL S2 OF THE ENGINE CONTROL

MODULE

→

TERMINAL 6 OF THE ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID

→

GROUND, AND CONTINUITY TO

SOLENOID NO. 1 AND NO. 2 CAUSES THE SHIFT.
FOR THE 3RD SPEED, THERE IS NO CONTINUITY TO NO. 1 SOLENOID, ONLY TO NO. 2, CAUSING THE SHIFT.
SHIFTING INTO 4TH SPEED (OVERDRIVE) TAKES PLACE WHEN THERE IS NO CONTINUITY TO EITHER NO. 1 OR NO. 2 SOLENOID.

2. LOCK–UP OPERATION

WHEN THE ENGINE CONTROL MODULE JUDGES FROM EACH SIGNAL THAT LOCK–UP OPERATION CONDITIONS HAVE BEEN MET,
CURRENT FLOWS FROM TERMINAL SL OF THE ENGINE CONTROL MODULE

→

TERMINAL 2 OF THE ELECTRONICALLY

CONTROLLED TRANSMISSION SOLENOID

→

GROUND, CAUSING CONTINUITY TO THE LOCK–UP SOLENOID AND CAUSING

LOCK–UP OPERATION.

3. STOP LIGHT SW CIRCUIT

IF THE BRAKE PEDAL IS DEPRESSED (STOP LIGHT SW ON) WHEN DRIVING IN LOCK–UP CONDITION, A SIGNAL IS INPUT TO
TERMINAL STP OF THE ENGINE CONTROL MODULE, THE ENGINE CONTROL MODULE OPERATES AND CONTINUITY TO THE
LOCK–UP SOLENOID IS CUT.

4. OVERDRIVE CIRCUIT

∗

OVERDRIVE ON

WHEN THE O/D MAIN SW IS TURNED ON (O/D OFF INDICATOR LIGHT TURNS OFF), A SIGNAL IS INPUT TO TERMINAL OD2 OF
THE ENGINE CONTROL MODULE AND ENGINE CONTROL MODULE OPERATION CAUSES GEAR SHIFT WHEN THE
CONDITIONS FOR OVERDRIVE ARE MET.

∗

OVERDRIVE OFF

WHEN THE O/D MAIN SW IS TURNED TO OFF (O/D OFF INDICATOR LIGHT TURNS ON), THE CURRENT FLOWING THROUGH
THE O/D OFF INDICATOR LIGHT FLOWS THROUGH THE O/D MAIN SW TO GROUND. CAUSING THE INDICATOR LIGHT TO
LIGHT UP. AT THE SAME TIME, A SIGNAL IS INPUT TO TERMINAL OD2 OF THE ENGINE CONTROL MODULE AND ENGINE
CONTROL MODULE OPERATION PREVENTS SHIFT INTO OVERDRIVE.

SYSTEM OUTLINE

180

ELECTRONICALLY CONTROLLED TRANSMISSION

E 7 , E 8 ,E 9 ,E10 ENGINE CONTROL MODULE

S1, S2–E1 : 9.0–14.0 VOLTS WITH THE SOLENOID ON

0–1.5 VOLTS WITH SOLENOID OFF

L–E1 : 7.5–14.0 VOLTS WITH THE IGNITION SW ON AND SHIFT LEVER AT L POSITION
2–E1 : 7.5–14.0 VOLTS WITH THE IGNITION SW ON AND SHIFT LEVER AT 2 POSITION

R–E1 : 7.5–14.0 VOLTS WITH THE IGNITION SW ON AND SHIFT LEVER AT R POSITION

STP–E1 : 9.0–14.0 VOLTS WITH THE IGNITION SW ON AND BRAKE PEDAL DEPRESSED

THW–E2 : 0.2–1.0 VOLTS WITH THE ENGINE COOLANT TEMP. 60

C (140

F) –120

C (248

VTA1–E2 : 0.3–0.8 VOLTS WITH THE IGNITION SW ON AND THROTTLE VALVE FULLY CLOSED

3.2–4.9 VOLTS WITH THE IGNITION SW ON AND THROTTLE VALVE FULLY OPENED

VC–E2 : 4.5–5.5 VOLTS WITH THE IGNITION SW AT ON POSITION

OD1–E1 : 4.5–5.5 VOLTS WITH THE IGNITION SW AT ON POSITION

0D2–E1 : 9.0–14.0 VOLTS WITH THE IGNITION SW ON AND O/D MAIN SW TURNED OFF

0–3.0 VOLTS WITH THE IGNITION SW ON AND O/D MAIN SW TURNED ON

+B–E1 : 9.0–14.0 VOLTS WITH THE IGNITION SW AT ON POSITION

0 2 O/D MAIN SW

2–4 : CLOSED WITH THE O/D MAIN SW OFF, OPEN WITH THE O/D MAIN SW ON

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

C 8

E10

J28

C 9

J 4

J29

C10

J 7

J30

C14

J16

O 2

E 3

J17

P 1

E 4

J24

S10

E 7

J25

T 2

E 8

J26

V 2

E 9

J27

V 3

,,,

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)

INSTRUMENT PANEL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)

COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)

ENGINE ROOM MAIN WIRE AND ENGINE ROOM J/B (ENGINE COMPARTMENT LEFT)

COWL WIRE AND ENGINE ROOM J/B (ENGINE COMPARTMENT LEFT)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

IJ1

INSTRUMENT PANEL WIRE AND COWL WIRE (UNDER THE GLOVE BOX)

IK2

ENGINE WIRE AND COWL WIRE (UNDER THE GLOVE BOX)

IK3

ENGINE WIRE AND COWL WIRE (UNDER THE GLOVE BOX)

IL1

ENGINE WIRE AND INSTRUMENT PANEL WIRE (UNDER THE GLOVE BOX)

: GROUND POINTS

CODE

SEE PAGE

GROUND POINTS LOCATION

LEFT RADIATOR SIDE SUPPORT

SURGE TANK RH

REAR SIDE OF SURGE TANK

LEFT KICK PANEL

INSTRUMENT PANEL BRACE RH

: SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

I 5

ENGINE WIRE

SERVICE HINTS

181

AND A/T INDICATOR

14 15

13 14

4 X 6

X X X

X X

X 3 X

X 33 34

1 2 X 4

9 X

14 15

X X

6 7

X 23 24

D D D

C C C

A A A

A A

A A A A A A A A

C C

A A

A A A A A A A

A A X X X

A A

B B

D D X X

B B

X X F F

A A A A A

B B B B

D D D E E E

9 10

1 2 3

1 2

C 8

C GRAY

C 9

D BROWN

C10

E10

E 9

E 8

E 7

J28

J29

C14

E 3 GRAY

E 4 DARK GRAY

J 4 BLACK

J 7

J25

J24

J17 BLUE

J16 ORANGE

J26

J30

S10

P 1 GRAY

O 2 BLUE

V 3 BLACK

V 2 BLACK

T 2 BLACK

A A A A A

BLUE

C C

A A

J27

(HINT : SEE PAGE 7)

Content .. 644 645 646 647 ..