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 IGNITION COIL (WITH IGNITER) AND SPARK TEST
Check that the spark occurs.
1. Remove the ignition coils (with igniter) (See REMOVAL ).
2. Remove the spark plugs.
3. Install the spark plugs to each ignition coil (with igniter), and connect the ignition coil (with igniter) connector.
4. Disconnect the 8 injector connectors.
5. Ground the spark plug.
6. Check 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:
  
  Fig 1: Spark Test Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Using a 16 mm plug wrench, install the spark plugs.
  1. Torque: 17.5 N.m (180 kgf.cm, 13 ft.lbf)
8. Reinstall the ignition coils (with igniter) (See REMOVAL ).

INSPECT SPARK PLUGS

NOTE:

Never use a wire brush for cleaning.
Never attempt to adjust the electrode gap on used spark plug.
Spark plug should be replaced every 100,000 km (60,000 miles).

Remove the ignition coils (with igniter) (See REMOVAL ).
Check the electrode.
- Using a megger (insulation resistance meter), measure the insulation resistance.
  Correct insulation resistance: 10 MΩ or more
  
  Fig 2: Checking Electrode Using Megger
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the resistance is less than specified, proceed to step d.
  
  NOTE: If a megger is not available, the following simple method of inspection 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 ... OK.
    
    If the electrode is wet... Proceed to step d.
  - Reinstall the spark plug. (See step g)
    
    Fig 3: Checking Spark Plug Carbon
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Using a 16 mm plug wrench, remove the spark plugs.

Fig 4: Removing Spark Plug
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the spark plug for thread damage and insulator damage.

If abnormal, replace the spark plug.

RECOMMENDED SPARK PLUG

Manufacturer	Type
DENSO made	SK20R11
NGK made	IFR6A11

Fig 5: Checking Spark Plug Thread & Insulator

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the spark plug electrode gap.
1. Maximum electrode gap for used spark plug: 1.3 mm (0.051 in.)
Fig 6: Measuring Spark Plug Gap
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the gap is greater than maximum, replace the spark plug.
1. 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 a used plug.
Clean the spark plugs.
If the electrode has traces of wet carbon, allow it to dry and then clean with a spark plug cleaner.
1. Air pressure: Below 588 kPa (6 kgf/cm ² , 85 psi)
2. Duration: 20 seconds or less
Fig 7: Cleaning Spark Plug With Spark Plug Cleaner
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: If there are traces of oil, remove it with gasoline before using the spark plug cleaner.
Using a 16 mm plug wrench, install the spark plugs.
1. Torque: 17.5 N.m (180 kgf.cm, 13 ft.lbf)
Reinstall the ignition coils (with igniter) (See REMOVAL ).