Toyota Sequoia (2005). Manual - part 181

DIDIK–01

D13871

Combination Meter

DLC3

Stop Light Switch

ECM

Park/Neutral Position Switch

Speed Sensor (SP2)

Shift Solenoid Valve S1

Shift Solenoid Valve SR

Shift Solenoid Valve SLU

Shift Solenoid Valve SL2

ATF Temperature
Sensor No. 2

Integration Control and Panel
(Shift Position L Switch)

 MIL

Shift Solenoid Valve SL1

Shift Solenoid 
Valve SLT

ATF Temperature
Sensor No.1

Shift Solenoid Valve S2

Speed Sensor (NT)

 AT Oil Temp Warning Light

Shift Lever 
(O/D Main Switch)

4WD:

4WD Control ECU

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–519

713

LOCATION

DIDIL–01

D14205

Shift Solenoid Valve S1

MIL 
(Malfunction Indicator Lamp)

S1

S2

SL1

SL2

SLT

SLU

SR

W

Shift Solenoid Valve S2

Shift Solenoid Valve SL1

Shift Solenoid Valve SL2

Shift Solenoid Valve SLT

Shift Solenoid Valve SLU

Shift Solenoid Valve SR

OILW

AT Oil Temp Warning Light

ECM

Crankshaft Position Sensor

Engine CoolantTemperature Sensor

Combination Meter

Stop Lamp Switch Assy

DLC3
(Data Link Connector 3)

THW

VTA1, 2

VC

SPD

STP

TH01

TC

Throttle Position Sensor

ATF (Automatic Transmission
Fluid) Temperature Sensor No. 1

Mass Air Flow Meter

Accelerator Pedal Position Sensor

VPA

VPA2

Shift Lever
(O/D Main Switch)

Input Speed Sensor (NT)

NT

Output Speed Sensor (SP2)

SP2

TH02

ATF (Automatic Transmission
Fluid) Temperature Sensor No. 2

Skid Control ECU

NSW

Park/Neutral Position Switch

R, D, 3, 2

VG

NE

L

ODMS

Integration Control and Panel
(Shift Position L Switch)

L4 

: 4WD

4WD Control ECU

CAN

DI–520

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

714

SYSTEM DIAGRAM

The configuration of the electronic control system in the A750E/A750F automatic transmission is as shown
in the following chart.

DIDIM–01

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–521

715

SYSTEM DESCRIPTION

SYSTEM DESCRIPTION
The ECT (Electronic controlled automatic transmission) is an automatic transmission that electronically con-
trols shift timing using the ECM. The ECM detects electrical signals that indicate engine and driving condi-
tions, and controls the shift point, based on driver habits and road conditions. As a result, fuel efficiency and
power transmission performance are improved.
Shift shock has been reduced by controlling the engine and transmission simultaneously.
In addition, the ECT has features such as follows:

Diagnostic function.

Fail–safe function when a malfunction occurs.

DIDIN–01

Vehicle Brought to Workshop

Customer Problem Analysis

Check DTC and Freeze Frame Data (Precheck)

Record or Print DTC and  Freeze Frame Data 

DI–565

Clear DTC and Freeze Frame Data 

DI–565

Visual Inspection

Setting the Check Mode Diagnosis 

DI–566

1

Items inside

are titles of pages in this manual, with the

page number indicated in the bottom portion. See the indicated
pages for detailed explanations.

DI–523

Connect a hand–held tester to DLC3.

If the display shows ”UNABLE TO CONNECT TO VEHICLE” when you have connected the
scan tool/hand–held tester, inspect DLC3 

DI–562

2

3

4

5

6

Symptom does not occur

Problem Symptom Confirmation

8

7

Symptom Simulation

P.

IN–24

Symptom occurs

DTC Check

DI–565

OK Code

11

Preliminary Check

DI–524

DTC Chart

DI–573

Mechanical System Test

DI–538

 and 

DI–540

Manual Shifting Test

DI–542

OK

OK

Chapter 1
(Electronic)

Chapter 2
(On–Vehicle)

DI–553

OK

Chapter 3
(Off–Vehicle)

OK

Matrix Chart of Problem Symptoms – 

DI–553

Circuit
Inspection

NG

Parts Inspection

NG

NG

NG

Identification of Problem

Repair

Confirmation Test

End

NG

NG

12

OK

13

14

15

16

17

9

10

DI–553

DI–553

DI–576

 to  

DI–691

18

 O/D Main Switch Circuit Check

 Shift Position L Switch Circuit Check

DI–522

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

716

HOW TO PROCEED WITH TROUBLESHOOTING