Ignition System (2UZ-FE): Inspection

INSPECT SPARK PLUG
NOTE:
- Never use a wire brush for cleaning.
- Never attempt to adjust the electrode gap on a used spark plug.
- The spark plug should be replaced every 200,000 km (120,000 miles).
1. Check the electrode.
  1. Using an ohmmeter, measure the insulation resistance.
    Correct insulation resistance: 10 MΩ or more
    
    If the resistance is below the specified range, proceed to step ( d).
    
    HINT:
    
    If an ohmmeter is not available, the following simple inspection provides fairly accurate results.
    
    Fig 1: Checking Electrode
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Simple Method:
  1. Quickly race the engine to 4,000 rpm 5 times.
  2. Remove the spark plug.
  3. Visually check the spark plug.
    
    Fig 2: Visually Checking Spark Plug
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. If the electrode is dry...OK.
  5. If the electrode is wet...Proceed to step ( c).
  6. Reinstall the spark plug.
3. Check the spark plug for thread or insulator damage.
  If damaged, replace the spark plug.
  
  Recommended spark plug:
  RECOMMENDED SPARK PLUG
  
  NGK made IFR6A11
  
  Fig 3: Checking Spark Plug For Thread Or Insulator Damage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Measure the spark plug electrode gap.
  Maximum electrode gap for used spark plug: 1.3 mm (0.051 in.)
  
  If the gap is greater than the maximum, replace the spark plug.
  
  Correct electrode gap for new spark plug: 1.0 to 1.1 mm (0.039 to 0.043 in.)
  
  Fig 4: Measuring Spark Plug Electrode Gap
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. 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: Blow 588 kPa (6 kgf/cm ² , 85 psi)
  - Duration: 20 seconds or less
  HINT:
  
  If there are traces of oil, remove them with gasoline before using a spark plug cleaner.
  
  Fig 5: Cleaning Spark Plugs
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
VVT SENSOR
1. Using an ohmmeter, measure the resistance between the terminals.
  Resistance:
  - at cold: 835 to 1,400 Ω
  - at hot: 1,060 to 1,645 Ω
  NOTE: "Cold" and "Hot" above mean 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 CRANKSHAFT POSITION SENSOR
1. Using an ohmmeter, measure the resistance between the terminals.
  Resistance:
  - at cold: 1,630 to 2,740 Ω
  - at hot: 2,065 to 3,225 Ω
  NOTE: "Cold" and "Hot" above mean 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).