Toyota Sequoia (2005). Manual - part 106

A21025

Wire Harness Side:

I1

I2

I3

I4

I5

I6

I7

I8

Ignition Coil with Igniter Connector

B17412

E8

IGF2

IGF1

ECM Connector

–

DIAGNOSTICS

ENGINE

DI–227

421

2

Check for open and short in harness and connector in IGF signal circuits be-
tween ECM and ignition coil with igniter.

PREPARATION:
(a)

Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil with
igniter connector.

(b)

Disconnect the E8 ECM connector.

CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:

Standard:

Tester Connection

Specified Condition

Ignition coil (I1–2) – IGF1 (E8–24)

Below 1 

Ω

Ignition coil (I2–2) – IGF2 (E8–25)

Below 1 

Ω

Ignition coil (I3–2) – IGF1 (E8–24)

Below 1 

Ω

Ignition coil (I4–2) – IGF2 (E8–25)

Below 1 

Ω

Ignition coil (I5–2) – IGF1 (E8–24)

Below 1 

Ω

Ignition coil (I6–2) – IGF2 (E8–25)

Below 1 

Ω

Ignition coil (I7–2) – IGF1 (E8–24)

Below 1 

Ω

Ignition coil (I8–2) – IGF2 (E8–25)

Below 1 

Ω

Ignition coil (I1–2) or IGF1 (E8–24) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I2–2) or IGF2 (E8–25) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I3–2) or IGF1 (E8–24) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I4–2) or IGF2 (E8–25) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I5–2) or IGF1 (E8–24) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I6–2) or IGF2 (E8–25) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I7–2) or IGF1 (E8–24) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I8–2) or IGF2 (E8–25) – 

Body ground

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

B17411

IGF1

IGF2 (+)

(+)

E8

E6

E1 (–)

DI–228

–

DIAGNOSTICS

ENGINE

422

3

Disconnect ignition coil with igniter connector, and check voltage between ter-
minals IGF1, IGF2 and E1 of ECM connector.

PREPARATION:
(a)

Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil with
igniter connector.

(b)

Turn the ignition switch ON.

CHECK:
Measure the voltage between the E8 and E6 ECM connectors.
OK:

Standard:

Tester Connection

Specified Condition

IGF1 (E8–24) – E1 (E6–1)

4.5 to 5.5 V

IGF2 (E8–25) – E1 (E6–1)

4.5 to 5.5 V

NG

Replace ECM (See page 

SF–80

).

OK

Replace ignition coil with igniter.

A21025

Wire Harness Side:

I1

I2

I3

I4

I5

I6

I7

I8

Ignition Coil with Igniter Connector

B17412

E8

IGT8

IGT2

IGT4

IGT5

IGT6

IGT3

IGT7

IGT1

ECM Connector

–

DIAGNOSTICS

ENGINE

DI–229

423

4

Check for open and short in harness and connector in IGT signal circuit between
ECM and ignition coil with igniter.

PREPARATION:
(a)

Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition with ig-
niter coil connector.

(b)

Disconnect the E8 ECM connector.

CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:

Standard:

Tester Connection

Specified Condition

Ignition coil (I1–2) – IGT1 (E8–8)

Below 1 

Ω

Ignition coil (I2–2) – IGT2 (E8–15)

Below 1 

Ω

Ignition coil (I3–2) – IGT3 (E8–11)

Below 1 

Ω

Ignition coil (I4–2) – IGT4 (E8–10)

Below 1 

Ω

Ignition coil (I5–2) – IGT5 (E8–13)

Below 1 

Ω

Ignition coil (I6–2) – IGT6 (E8–12)

Below 1 

Ω

Ignition coil (I7–2) – IGT7 (E8–14)

Below 1 

Ω

Ignition coil (I8–2) – IGT8 (E8–9)

Below 1 

Ω

Ignition coil (I1–2) or IGT1 (E8–8) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I2–2) or IGT2 (E8–15) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I3–2) or IGT3 (E8–11) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I4–2) or IGT4 (E8–10) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I5–2) or IGT5 (E8–13) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I6–2) or IGT6 (E8–12) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I7–2) or IGT7 (E8–14) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I8–2) or IGT8 (E8–9) – 

Body ground

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

B17411

E8

IGT8

IGT2

IGT4

IGT5

IGT6

IGT3

IGT7

IGT1

E1

(+)

(–)

(+)

(+)

(+)

(+)

(+)

(+)

(+)

E6

DI–230

–

DIAGNOSTICS

ENGINE

424

5

Check voltage between terminals IGT1 – IGT8 and E1 of ECM connector.

PREPARATION:
Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminals the E8 and E6 ECM
connectors when the engine is cranked.
OK:

Standard:

Tester Connection

Specified Condition

IGT1 (E8–8) – E1 (E6–1)

More than 0.1 V or less than 4.5 V

IGT2 (E8–15) – E1 (E6–1)

More than 0.1 V or less than 4.5 V

IGT3 (E8–11) – E1 (E6–1)

More than 0.1 V or less than 4.5 V

IGT4 (E8–10) – E1 (E6–1)

More than 0.1 V or less than 4.5 V

IGT5 (E8–13) – E1 (E6–1)

More than 0.1 V or less than 4.5 V

IGT6 (E8–12) – E1 (E6–1)

More than 0.1 V or less than 4.5 V

IGT7 (E8–14) – E1 (E6–1)

More than 0.1 V or less than 4.5 V

IGT8 (E8–9) – E1 (E6–1)

More than 0.1 V or less than 4.5 V

NG

Replace ECM (See page 

SF–80

).

OK