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Lexus ES300 (2002 year). Manual - part 52

Electronically Controlled Transmission and A/T Indicator

100

120

110

130

101

121

111

104

107

127

103

123

110

103

109

101

100

IL1

IL2

IL1

104

124

104

(*1)
(*2)

L–

W–

R–

G–

B–

–

W–L

L–W

Y–B

R–B

R–L

W–

L–

Y–

R–

A/T Indicator Light SW

A 4

L–B

V–W

114

119

87 3B

107

Y–

W–

L–B

MT2

MT4

MTL

NSSL

NSSD

MTD

Transmission
Control SW

T 8

Combination Meter

C 7(A), C 8(B)

10A
GAUGE2

10A
GAUGE1

From Power Source System (See Page 56)

W–

* 1 : w/ VSC
* 2 : w/o VSC

IL2

1 A

57 3A

(* 2)

(* 1)

(* 2)

(* 1)

85 3A

8 2M

Combination Meter

C 7(A), C 8(B)

L–

(*2

)

Skid Control ECU
with Actuator

S 1

peedom

R–L

IF7

L–

(*2

)

R–

Power

Micro Computer

Electronically Controlled Transmission and A/T Indicator

Previous automatic transaxle have selected each gear shift using mechanically controlled throttle hydraulic pressure,
governor hydraulic pressure and lock–up hydraulic pressure. The electronically controlled transmission, however, electrically
controls the line pressure, throttle pressure, lock–up pressure and accumulator pressure etc. through the solenoid valve. The
electronically controlled transmission is a system which precisely controls gear shift timing and lock–up timing in response to
the vehicle’s driving conditions and the engine condition detected by various sensors. It makes smooth driving possible by
shift selection for each gear which is the most appropriate to the driving conditions at that time, and by preventing downing,
squat and gear shift shock when starting off.

1. Gear Shift Operation

When driving, the engine warm up condition is input as a signal to TERMINAL THW of the engine control module from the
engine coolant temp. sensor and the vehicle speed signal is input to TERMINAL SPD of the engine control module. At the
same time, the throttle valve opening signal from the throttle position sensor is input to TERMINALS VTA1 and VTA2 of the
engine control module as throttle angle signal.
Based on these signals, the engine control module selects the best shift position for the driving conditions and sends current
to the electronically controlled transmission solenoid.

2. Lock–Up Operation

When each signal makes engine control module recognize that LOCK–UP condition is satisfied, the current flows from
engine control module TERMINAL DSL to electronically controlled transmission solenoid TERMINAL DSL. At the same time,
the current flows engine control module TERMINAL SL1+ to electroically controlled transmission solenoid TERMINAL SL1+
and from TERMINAL SL1– to engine control module TERMINAL SL1–. This works LOCK–UP solenoid to perform
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 cuts the current to the solenoid to release lock–up.

E6 (A), E7 (B), E8 (C), E9 (D), E10 (E) Engine Control Module

L–E1 : 10.0–14.0 volts (Ignition SW on and shift lever at L position)
2–E1 : 10.0–14.0 volts (Ignition SW on and shift lever at 2 position)

R–E1 : 10.0–14.0 volts (Ignition SW on and shift lever at R position)
D–E1 : 10.0–14.0 volts (Ignition SW on and shift lever at D position)

THO–E2 : Below 1.0 volts (Ignition SW on and AFT temperature 110

C (230

A4 A/T Indicator Light SW

3–1 : Closed with shift lever in P position
3–2 : Closed with shift lever in R position
3–5 : Closed with shift lever in N position
3–7 : Closed with shift lever in D position
3–8 : Closed with shift lever in L position
3–4 : Closed with shift lever in 2 position

: Parts Location

Code

See Page

Code

See Page

Code

See Page

S13

E10

I14

J11

: Relay Blocks

Code

See Page

Relay Blocks (Relay Block Location)

Engine Room R/B (Engine Compartment Left)

System Outline

Service Hints

: Junction Block and Wire Harness Connector

Code

See Page

Junction Block and Wire Harness (Connector Location)

Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)

(

)

Engine Wire and Engine Room J/B (Engine Compartment Left)

Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)

Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)

Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)

(

)

34 (w/ VSC)

35 (w/o VSC)

Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)

34 (w/ VSC)

Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)

35 (w/o VSC)

: Connector Joining Wire Harness and Wire Harness

Code

See Page

Joining Wire Harness and Wire Harness (Connector Location)

IF5

IF6

Engine Room Main Wire and Instrument Panel Wire (Right Side of Steering Column Tube)

IF7

( g

)

IK1

Instrument Panel Wire and Instrument Panel Wire (Instrument Panel Reinforcement RH)

IL1

Engine Wire and Instrument Panel Wire (Behind the Glove Box)

IL2

Engine Wire and Instrument Panel Wire (Behind the Glove Box)

: Ground Points

Code

See Page

Ground Points Location

Left Fender

Left Side of Cylinder Head

Intake Side of Cylinder Block

Instrument Panel Reinforcement LH

Instrument Panel Brace RH

: Splice Points

Code

See Page

Wire Harness with Splice Points

Code

See Page

Wire Harness with Splice Points

Engine Room Main Wire

Engine Wire

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