Toyota Sequoia (2005). Manual - part 105

A03401

IGT Signal Waveform

IGT

GND

IGF

20 msec./Division

GND

A20793

Normal

Ignition signal 
(IGT)

Ignition 
confirmation 
signal (IGF)

Malfunction

Circuit Open

ECM

IGF

IGT

Igniter

Ignition Coil

Time

Ignition Coil with Igniter

–

DIAGNOSTICS

ENGINE

DI–223

417

DTC No.

DTC Detecting Condition

Trouble Area

P0351

P0352

P0353

P0354

P0355

P0356

P0357

P0358

No IGF signal to ECM while engine is running

Open or short in IGF1 or IGF2 and IGT1 to IGT8 circuit from

ignition coil with igniter to ECM

No. 1 to No. 8 ignition coil with igniter (primary ignition)

Ignition system

ECM

Reference: Inspection using the oscilloscope.
During cranking or idling, check the waveform between termi-
nals IG1 to IG8 and E1, and IGF1, IGF2 and E1 of the E6 and
E8 ECM connectors.

MONITOR DESCRIPTION

If the ECM does not receive the IGF after sending the IGT it interprets this as a fault in the igniter and sets
a DTC.

DI–224

–

DIAGNOSTICS

ENGINE

418

MONITOR STRATEGY

P0351

No. 1 ignition coil with igniter circuit malfunction

P0352

No. 2 ignition coil with igniter circuit malfunction

P0353

No. 3 ignition coil with igniter circuit malfunction

R l t d DTC

P0354

No. 4 ignition coil with igniter circuit malfunction

Related DTCs

P0355

No. 5 ignition coil with igniter circuit malfunction

P0356

No. 6 ignition coil with igniter circuit malfunction

P0357

No. 7 ignition coil with igniter circuit malfunction

P0358

No. 8 ignition coil with igniter circuit malfunction

Required sensors/components

Igniter

Frequency of operation

Continuous

Duration

0.256 sec. + 4 sparks

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

It

Specification

Item

Minimum

Maximum

The monitor will run whenever these

DTCs are not present

See page 

DI–18

Engine speed

–

1,500 rpm

Either of the following conditions is met:

Condition 1 or 2

1. Following conditions are met:

Condition (a) and (b)

(a) Engine speed

–

500 rpm

(b) Battery voltage

6 V

–

2. Following conditions are met:

Condition (a) and (b)

(a) Engine speed

500 rpm

–

(b) Battery voltage

10 V

–

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

”Ignition signal fail count”

More than 2

”Ignition signal fail count” is on the right:

When IGF does not return despite sending IGT.

COMPONENT OPERATING RANGE

Standard Value

Confirmed signal number = ignition signal number

A15470

A19381

I8 Ignition Coil with Igniter No. 8

B–W

BR

2

3

Ignition Coil with Igniter No. 7

I7

4

1

B–R

B–R

ECM

24
E8 IGF1

IGF2

IGT8

E8

25

12

E8

IGT7

9

E8

IGT6

11

E8

15

E8 IGT5

E8

8

IGT4

IGT3

E8

14

IGT2

13

E8

E8

10

IGT1

I18 Ignition SW

W–R

IG2 AM2

5

1C

2

1C

3

IGN2

Instrument Panel J/B

2

1D

7

B–R

5

IG4

B–R

W–R

Engine Room J/B

2C

1

2D

AM2

1

2

B

Battery

F10
Fusible Link Block

4

1

2

N1 Noise Filter No. 1

B–R

1

3

B–R

4

BR

EC

2

I1 Ignition Coil with Igniter No. 1

B–R

I2 Ignition Coil with Igniter No. 2

1

3

4

2

B–W

BR

B–R

I3 Ignition Coil with Igniter No. 3

BR

BR

B–R

B–R

B–R

B–R

B–R

B–R

B–R

B–R

3

B–R

1

4

2

B–W

I4 Ignition Coil with Igniter No. 4

4

1

3

2

I5 Ignition Coil with Igniter No. 5

B–W

I6 Ignition Coil with Igniter No. 6

1

3

2

4

1

3

2

4

1

4

2

3

BR

B–W

G–R

P–L

G–W

R–W

G–B

LG–B

B–L

B–R

LG

BR

BR

BR

1J

BR

B–R

B–R

B–R

B–R

6

B–R

BR

BR

BR

BR

BR

BR

BR

B–R

B–R

B–R

B

–

DIAGNOSTICS

ENGINE

DI–225

419

WIRING DIAGRAM

DI–226

–

DIAGNOSTICS

ENGINE

420

INSPECTION PROCEDURE

HINT:

If DTCs P0351, P0354, P0356 and P0357 are output simultaneously, IGF1 circuit may be open or
short.

If DTCs P0352, P0353, P0355 and P0358 are output simultaneously, IGF2 circuit may be open or
short.

Read freeze frame data using 

the hand−held tester

. Freeze frame data records the engine conditions

when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air–fuel ratio was lean or
rich, as well as other data from the time when a malfunction occurred.

1

Check spark plug and spark (See page 

IG–1

).

NG

Go to step 4.

OK