Toyota Sequoia (2005). Manual - part 98

A19431

A19884

–

DIAGNOSTICS

ENGINE

DI–195

389

6

Change normal spark plug and check spark of misfiring cylinder.

PREPARATION:
(a)

Change to the normal spark plug.
(1)

Remove the spark plug that may be faulty from the
ignition coil assembly.

(2)

Install another spark plug to the ignition coil assem-
bly.

(b)

Disconnect the injector connector.

(c)

Ground the spark plug.

CHECK:
Check if spark occurs while the engine is being cranked.
CAUTION:
Always disconnect each injector connector.
NOTICE:
Do not crank the engine for more than 2 seconds.
OK:

Spark jumps across electrode gap.

OK

Replace spark plug.

NG

A21025

Wire Harness Side:

I1

I2

I3

I4

I5

I6

I7

I8

Ignition Coil Connector

B17412

E8

IGF2

IGF1

ECM Connector

DI–196

–

DIAGNOSTICS

ENGINE

390

7

Check for open and short in harness and connector between ignition coil and
ECM.

Check the harness and connector between the ignition coil
and the ECM (IGF terminal) connectors:
PREPARATION:
(a)

Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil con-
nector.

(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

A21025

Ignition Coil Connector

I1

I2

I3

I4

I5

I6

I7

I8

Wire Harness Side:

B17412

E8

IGT8

IGT2

IGT4

IGT5

IGT6

IGT3

IGT7

IGT1

ECM Connector

–

DIAGNOSTICS

ENGINE

DI–197

391

Check the harness and connector between the ignition coil
and the ECM (IGT terminal) connectors:
PREPARATION:
(a)

Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil con-
nector.

(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 (I1–3) – IGT1 (E8–8)

Below 1 

Ω

Ignition coil (I2–3) – IGT2 (E8–15)

Below 1 

Ω

Ignition coil (I3–3) – IGT3 (E8–11)

Below 1 

Ω

Ignition coil (I4–3) – IGT4 (E8–10)

Below 1 

Ω

Ignition coil (I5–3) – IGT5 (E8–13)

Below 1 

Ω

Ignition coil (I6–3) – IGT6 (E8–12)

Below 1 

Ω

Ignition coil (I7–3) – IGT7 (E8–14)

Below 1 

Ω

Ignition coil (I8–3) – IGT8 (E8–9)

Below 1 

Ω

Ignition coil (I1–3) or IGT1 (E8–8) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I2–3) or IGT2 (E8–15) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I3–3) or IGT3 (E8–11) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I4–3) or IGT4 (E8–10) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I5–3) or IGT5 (E8–13) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I6–3) or IGT6 (E8–12) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I7–3) or IGT7 (E8–14) – 

Body ground

10 k

Ω

 or higher

Ignition coil (I8–3) or IGT8 (E8–9) – 

Body ground

10 k

Ω

 or higher

OK

Replace ignition coil with igniter, then confirm
that there is no misfire.

NG

Repair or replace harness or connector.

B17411

#80

#70

#60

#50

#30

#20

#10

(+)

(+)

(+)

(+)

(+)

(+)

(+)

#40(+)

E01 (–)

E8

E6

DI–198

–

DIAGNOSTICS

ENGINE

392

8

Check ECM terminal of misfiring cylinder.

PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between the terminals of the E6 and E8
ECM connectors.
OK:

Standard:

Tester Connection

Specified Condition

#10 (E6–2) – E01 (E8–7)

9 to 14 V

#20 (E6–3) – E01 (E8–7)

9 to 14 V

#30 (E6–4) – E01 (E8–7)

9 to 14 V

#40 (E6–5) – E01 (E8–7)

9 to 14 V

#50 (E6–6) – E01 (E8–7)

9 to 14 V

#60 (E6–7) – E01 (E8–7)

9 to 14 V

#70 (E8–3) – E01 (E8–7)

9 to 14 V

#80 (E8–2) – E01 (E8–7)

9 to 14 V

OK

 Go to step 11.

NG

9

Check injector resistance of misfiring cylinder (See page 

SF–24

).

NG

 Replace injector.

OK