Ignition System: Inspection

NOTE: In this section, the terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately - 10°C (14°F) to 50°C (122°F). "Hot" means approximately 50°C (122°F) to 100°C (212°F).

INSPECT SPARK PLUG
NOTE:
- Do not use a wire brush for cleaning.
- Do not attempt to adjust the electrode gap of a used spark plug.
1. Check the electrode.
  1. Using an mega ohmmeter, measure the insulation resistance.
    Correct insulation resistance: 10 MΩ or higher
    
    Fig 1: Measuring Insulation Resistance Using Mega ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  If the resistance is less than the specified value, proceed to step ( d).
  
  HINT:
  
  If the ohmmeter is not available, perform the following simple inspection instead.
2. Alternative inspection method:
  1. Quickly accelerate the engine to 4,000 RPM 5 times.
  2. Remove the spark plug.
  3. Visually check the spark plug.
    - If the electrode is dry, the spark plug is functioning. Reinstall the spark plug. Proceed to step 3.
    - If the electrode is damp, proceed to steps (c), ( d) and ( e).
3. Check the spark plug for any damage on its thread and insulator.
  If there is damage, replace the spark plug. If not, reinstall the spark plug.
  
  Recommended spark plug:
  
  Fig 2: Checking spark Plug
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 3: Recommended Spark Plug Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check 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: Checking Spark Plug Electrode Gap
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  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.
5. Clean the spark plugs.
  If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner and then dry it.
  
  Air pressure: 588 kPa (6 kgf/cm ² , 85 psi)
  
  Duration: 20 seconds or less
  
  HINT:
  
  Only use the spark plug cleaner when the electrode is free of oil. If the electrode has traces of oil, use gasoline to clean off the oil, use gasoline to clean off the oil before using the spark plug cleaner.
  
  Fig 5: Identifying Spark Plug cleaner
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT CAMSHAFT POSITION SENSOR
1. Using an ohmmeter, measure the resistance between the terminals.
  Standard:
  
  Fig 6: Inspect Camshaft Position Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 7: Camshaft Position Sensor Standard Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the resistance is not as specified, replace the sensor.
INSPECT CRANKSHAFT POSITION SENSOR
1. Using an ohmmeter, measure the resistance between the terminals.
  Standard:
  
  Fig 8: Inspecting Crankshaft Position Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 9: Crankshaft Position Sensor Standard Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the resistance is not as specified, replace the sensor.