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: Ignition Test Flow Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Using a 16 mm plug wrench, install the spark plugs.
  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

If the resistance is less than specified, proceed to step d.

HINT:

If a megger is not available, the following 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 step (c)).
  - Visually check the spark plug.
    If the electrode is dry: OK.
    
    If the electrode is wet: Proceed to step d.
    
    Fig 3: Inspecting Spark Plug Electrode Gap
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  - Reinstall the spark plug. (See step g)
Using a 16 mm plug wrench, remove the spark plugs.

Fig 4: Removing Spark Plugs Using Plug Wrench
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:

SPARK PLUGS SPECIFICATIONS

DENSO made	SK20R11
NGK made	IFR6A11

Fig 5: Identifying Spark Plug

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.)

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.

Fig 6: Checking Spark Plug Electrode Gap
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.

Fig 7: Cleaning Spark Plugs
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Using a 16 mm plug wrench, install the spark plugs.
Torque: 17.5 N.m (180 kgf.cm, 13 ft.lbf)
Reinstall the ignition coils (with igniter) (See REMOVAL ).