Toyota Sequoia (2005). Manual - part 51

B17430

HA1A

A1A+

A1A–

HA2A

A2A+

A2A–

HT1B

OXIB

HT2B

OX2B

E2

PRG

ACIS

AIV1

AIV2

THA

E2G

VG

E2

THW

PPMP

VPMP

MPMP

#10

#20

#30

#40

#50

#60

#70

#80

IGT1

IGT2

IGT3

IGT4

IGT5

IGT6

IGT7

IGT8

IGF1

IGF2

To A/F Relay

A/F Sensor 
(Bank 1 Sensor 1)

A/F Sensor 
(Bank 2 Sensor 1)

HO2 Sensor 
(Bank 1 Sensor 2)

HO2 Sensor 
(Bank 2 Sensor 2)

To EFI Relay

To EFI No.2
Fuse

VSV (EVAP)

VSV (ACIS)

VSV (AI Control)

VSV (AI Control)

Mass Air Flow
Meter

ETC Sensor

Pump Modul

Pressure 
Sensor

Control 
Valve

To VC 
Terminal

To Battery

IGN2

Fuel Injector #1

Fuel Injector #2

Fuel Injector #3

Fuel Injector #4

Fuel Injector #5

Fuel Injector #6

Fuel Injector #7

Fuel Injector #8

Ignition Coil and
Igniter No.1

Ignition Coil and
Igniter No.2

Ignition Coil and
Igniter No.3

Ignition Coil and
Igniter No.4

Ignition Coil and
Igniter No.5

Ignition Coil and
Igniter No.6

Ignition Coil and
Igniter No.7

Ignition Coil and
Igniter No.8

–

DIAGNOSTICS

ENGINE

DI–7

201

B17431

AIDI

AIRP

AIRV

AIP

GE01

M+

M–

VTA1

VC

VTA2

FC

FPR

ACCR

ST1–

STP

E01

E02

E04

E05

E1

E03

ME01

EC

EOM

TC

CANL

CANH

IMI

IMO

DLC3

CG

TC

CANL

CANH

ASV

AI Driver

To EFI Relay

To Battery

To Battery

To Battery

To E2 
Terminal

To E2 
Terminal

To IG SW

Air Pump

Pressure
Sensor

Throttle Body

C/OPN Relay

Fuel Pump Relay

Fuel Pump Resister

Fuel Pump

Transponder Key
Computre

Stop Light SW

To IGN1 Fuse

To EFI
Relay

ACC Cut Relay

To Battery

DI–8

–

DIAGNOSTICS

ENGINE

202

DI3H8–10

Vehicle Brought to Workshop

Customer Problem Analysis P. 

DI–10

Problem Symptom Confirmation

If the engine does not start perform steps 10 and 12 first

Connect the OBD II scan tool or hand–held tester to DLC3.

If the display indicates a communication fault in the tool, inspect DLC3 P.

DI–40

Check DTC and Freeze Frame Data

Record or Print DTC and Freeze Frame Data P. 

DI–43

Clear DTC and Freeze Frame Data P. 

DI–43

Visual Inspection

Setting the Check Mode Diagnosis P. 

DI–44

Symptom Simulation P. 

IN–24

Basic Inspection P. 

DI–12

DTC Chart P. 

DI–58

Problem Symptoms Table P. 

DI–33

Circuit Inspection P. 

DI–73

Adjustment, Repair

DTC Check P. 

DI–43

Items inside

are titles of pages in

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

this manual, with the page number

Malfunction
occurs.

Malfunction does not occur.

Parts Inspection

Check for Intermittent Problems P. 

DI–11

Identification of Problem

Confirmation Test

End

1

2

3

4

5

6

7

10

8

9

11

12

13

15

14

16

Normal

Malfunction code.

17

The hand–held tester can be used at

bold frame.

–

DIAGNOSTICS

ENGINE

DI–9

203

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshoot in accordance with the procedure on the following page.

DI3H9–07

ENGINE CONTROL SYSTEM Check Sheet

Customer’s Name

Driver’s Name

Data Vehicle
Brought in

Engine model

VIN

Production Date

Licence Plate No.

Odometer Reading

Problem Symptoms

Engine does
not Start

Difficult to
Start

Poor Idling

Poor
Driveability

Engine Stall

Others

Engine does not crank

No initial combustion

No complete combustion

Engine cranks slowly

Other

Incorrect first idle

Idling rpm is abnormal

High (                    rpm)

Low (                    rpm)

Rough idling

Other

Hesitation

Back fire

Muffler explosion (after–fire)

Surging

Knocking

Other

Soon after starting

After accelerator pedal depressed

After accelerator pedal released

During A/C operation

Shifting from N to D

Other

Problem Frequency

Condition When

Problem Occurs

Weather

Engine Operation

Engine Temp.

Place

Outdoor

Temperature

Constant

Sometimes (          times per          day/month)

Once only

Other

Fine

Cloudy

Rainy

Snowy

Various/Other

Hot

Warm

Cool

Cold (approx.           

°

C/          

°

F)

Highway

Suburbs

Inner city

Uphill

Downhill

Rough road

Other

Cold

Warming up

After warming up

Any temp.

Other

Starting

Just after starting (          min.)

Idling

Racing

Driving

Constant speed

Acceleration

Deceleration

A/C switch ON/OFF

Other

Condition of malfunction indicator light

Remains on

Sometimes lights up

Does not light up

Normal

Malfunction code(s) (code                    )

Freeze frame data (                           )

Normal

Malfunction code(s) (code                    )

Freeze frame data (                           )

Normal Mode
(Pre–check)

Check Mode

DTC Inspection

Inspector’s
Name

km
miles

(MIL)

DI–10

–

DIAGNOSTICS

ENGINE

204

CUSTOMER PROBLEM ANALYSIS CHECK