On-Vehicle Inspection

NOTE: "Cold" and "Hot" in these sentences express the temperature of the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F).

INSPECT SPARK TEST
Check that the spark occurs.
1. Remove the ignition coils (with igniters) (See REPLACEMENT ).
2. Remove the spark plugs.
3. Install the spark plug to the ignition coil, and connect the ignition coil connector.
4. Ground the spark plug.
5. See if spark occurs while engine is being cranked.
NOTE: To prevent gasoline from being injected from injectors during this test, crank the engine for no more than 5-10 seconds at time.

If the spark does not occur, do the test as follows in Fig 1:

Fig 1: Spark Test Flow Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT SPARK PLUGS

NOTE:

Never use a wire brush for cleaning.
Never attempt to adjust the electrode gap on a used spark plug.
Spark plugs should be replaced every 193,000 km (120,000 miles).

Remove the 6 ignition coils (with igniters) (See REPLACEMENT ).
Inspect the electrode.
- Using a megger (insulation resistance meter), measure the insulation resistance.
  Standard correct insulation resistance:
  
  10 MΩ or more
  
  If the resistance is less than specified, proceed to d .
  
  HINT:
  
  If a megger is not available, these simple method of inspection provides fairly accurate results.
  
  Fig 2: Measuring Insulation Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Simple Method:
  - Quickly race the engine to 4,000 rpm 5 times.
  - Remove the spark plug (See c ).
  - Visually check the spark plug.
  - If the electrode is dry ... OK
  - If the electrode is wet ... Proceed to d
  - Reinstall the spark plug (See g ).
Fig 3: Inspecting Electrode
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
(c) Using a 16 mm plug wrench, remove the 6 spark plugs.

Visually check the spark plug for thread damage and insulator damage.

If abnormal, replace the spark plug.

Recommended spark plug:

SPARK PLUG DESCRIPTION

DENSO made	SK20R11
NGK made	IFR6A11

Fig 4: Removing Spark Plug

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Inspect the electrode gaps.
Maximum electrode gap for used spark plug:

1.3 mm (0.051 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.)

NOTE: 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 the used plug.

Fig 5: Inspecting Electrode Gaps
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
Using a 16 mm plug wrench, install the 6 spark plugs.
Torque: 18 N.m (180 kgf.cm, 13 ft.lbf)
Reinstall the 6 ignition coil (See REPLACEMENT ).