Lexus LS400 (2000 year). Service manual — part 104

IG0147

Megger

Ground

B01301

B01302

16 mm Plug Wrench

IG0316

–

IGNITION

IGNITION SYSTEM

IG–3

1460

(b)

Check the electrode.

Using a megger (insulation resistance meter), mea-
sure the insulation resistance.

Correct insulation resistance: 10 M

Ω

or more

If the resistance is less than specified, proceed to step (d).
HINT:
If a megger is not available, the following simple method of in-
spection provides fairly accurate results.

Simple Method:

Quickly race the engine to 4,000 rpm 5 times.

Remove the spark plug. (See step (c))

Visually check the spark plug.
If the electrode is dry ... Okay.
If the electrode is wet ... Proceed to step (d).

Reinstall the spark plug. (See step (g))

(c)

Using a 16 mm plug wrench, remove the spark plugs.

(d)

Check the spark plug for thread damage and insulator
damage.

If abnormal, replace the spark plug.

Recommended spark plug:

DENSO made

SK20R11

NGK made

IFR6A11

B02101

1.1 mm

IG0152

B01294

Ohmmeter

IG–4

–

IGNITION

IGNITION SYSTEM

1461

(e)

Check the spark plug electrode gap.
Maximum electrode gap for used spark plug:
1.2 mm (0.047 in.)

If the gap is greater than maximum, replace the spark plug.

Correct electrode gap for new spark plug:
1.1 mm (0.043 in.)

NOTICE:
If adjusting the gap of a new spark plug, bend only the base
of the ground electrode. Do not touch the tip. Never attempt
to adjust the gap on a used plug.
(f)

Clean the spark plugs.

If the electrode has traces of wet carbon, allow it to dry and then
clean with a spark plug cleaner.

Air pressure:
Below 588 kPa (6 kgf/cm

2

, 85 psi)

Duration:
20 seconds or less

HINT:
If there are traces of oil, remove it with gasoline before using the
spark plug cleaner.
(g)

Using a 16 mm plug wrench, install the spark plugs.
Torque: 17.5 N·m (180 kgf·cm, 13 ft·lbf)

(h)

Reinstall the ignition coils. (See page

IG–8

)

3.

INSPECT CAMSHAFT POSITION SENSOR

(a)

Remove the V–bank cover.

(b)

Remove the battery clamp cover.

(c)

Remove the air cleaner inlet.

(d)

Disconnect the camshaft position sensor connector.

(e)

Using an ohmmeter, measure the resistance between ter-
minals.
Resistance:

Cold

835 – 1,400

Ω

Hot

1,060 – 1,645

Ω

If the resistance is not as specified, replace the camshaft posi-
tion sensor.
(f)

Reconnect the camshaft position sensor connector.

(g)

Reinstall the air cleaner inlet.

(h)

Reinstall the battery clamp cover.

(i)

Reinstall the V–bank cover.

B02550

Ohmmeter

–

IGNITION

IGNITION SYSTEM

IG–5

1462

4.

INSPECT CRANKSHAFT POSITION SENSOR

(a)

Remove the oil pan protector and engine under cover.

(b)

Using an ohmmeter, measure the resistance between ter-
minals.
Resistance:

Cold

1,630 – 2,740

Ω

Hot

2,065 – 3,225

Ω

If the resistance is not as specified, replace the crankshaft posi-
tion sensor.
(c)

Reinstall the engine under cover and oil pan protector.

IG04R–02

B01293

IG–10

–

IGNITION

CAMSHAFT POSITION SENSOR

1467

REMOVAL

1.

REMOVE V–BANK COVER

2.

REMOVE BATTERY CLAMP COVER

3.

REMOVE AIR CLEANER INLET

4.

DRAIN ENGINE COOLANT (See page

CO–2

)

5.

DISCONNECT RADIATOR HOSE

6.

REMOVE NO.3 TIMING BELT COVER
(See page

EM–15

)

7.

DISCONNECT

CAMSHAFT POSITION SENSOR CON-

NECTOR

8.

REMOVE CAMSHAFT POSITION SENSOR
Remove the bolt, stud bolt and camshaft position sensor.