Ignition System

INSPECT HIGH-TENSION CORDS
1. Remove the No. 3 timing belt cover.
2. Remove the throttle body gasket (See REMOVAL )
3. Disconnect the high-tension cord set from the spark plugs.
  Disconnect the high-tension cords at the rubber boot. DO NOT pull on the cords.
  
  Fig 1: Disconnecting High-Tension Cords At Rubber Boot
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NOTE: Pulling on or bending the cords may damage the conductor inside.
4. Disconnect the high-tension cord set from the ignition coils.
  1. Using a screwdriver, lift up the lock claw and disconnect the holder from the ignition coils.
  2. Disconnect the high-tension cord at the grommet. DO NOT pull on the cord.
    NOTE:
    Pulling on or bending the cords may damage the conductor inside.
    
    Do not wipe any of the oil from the grommet after the high-tension cord is disconnected.
5. Using an ohmmeter, measure the resistance.
  
  Fig 3: Measuring Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Maximum resistance: 25 kΩ per cord
  
  If the resistance is greater than the maximum, check the terminals. If necessary, replace the high-tension cord.
6. Reconnect the high-tension cord set to the ignition coils.
  
  Fig 4: Reconnecting High-Tension Cord Set To Ignition Coils
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Assemble the holder and grommet.
  2. Align the spline of the ignition coil with the spline of the holder, and push in the cord.
    NOTE: Check that the holder is correctly installed to the grommet as shown in the illustration.
  3. Check that the lock claw of the holder is engaged by lightly pulling the holder.
7. Reconnect the high-tension cord set to the spark plugs.
  
  Fig 5: Reconnecting High-Tension Cord
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
8. Reinstall the throttle body gasket (See INSTALLATION )
9. Reinstall the No. 3 timing belt cover.
INSPECT SPARK PLUGS
NOTE:
- Never use a wire brush for cleaning.
- Never attempt to adjust the electrode gap on used a spark plug.
- spark plugs should be replaced every 100,000 km (60,000 miles).
1. Remove the ignition coils and high-tension cord set assembly (See REMOVAL )
2. Inspect the electrode.
  - Using a meager (insulation resistance meter), measure the insulation resistance.
    
    Fig 6: Measuring Insulation Resistance
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard correct insulation resistance: 10 MΩ or more
    
    If the resistance is less than specified, proceed to step ( d).
    
    NOTE: If a meager is not available, the following simple method of inspection provides fairly accurate results.
  - Simple Method:
    - Quickly race the engine 5 times to 4,000 RPM.
    - Remove the spark plug. (See 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 g)
3. Using a 16 mm plug wrench, remove the 6 spark plugs.
4. Visually check the spark plug for thread damage and insulator damage.
  
  Fig 7: Checking Spark Plug
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If abnormal, replace the spark plug.
  
  Recommended spark plug:
  
  Fig 8: Identifying Denso Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Inspect the electrode gap.
  
  Fig 9: Inspecting Electrode Gap
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  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:
  
  1.0 - 1.1 mm (0.039 - 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.
6. 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
  
  NOTE: If there are traces of oil, remove it with gasoline before using the spark plug cleaner.
  
  Fig 10: Identifying Spark Plug Cleaner
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Using a 16 mm plug wrench, reinstall the 6 spark plugs.
  Torque: 18 N.m (180 kgf.Cm, 13 ft.lbf)
8. Reinstall the ignition coils and high-tension cord set assembly (See INSTALLATION )
INSPECT IGNITION COILS
1. Remove the ignition coil assembly (See REMOVAL )
2. Using an ohmmeter, measure the resistance between the positive (+) and negative (-) terminals.
  Primary coil resistance:
  
  If the resistance is not as specified, replace the ignition coil.
  
  Fig 11: Primary Coil Resistance Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Using an ohmmeter, measure the resistance between the positive (+) and high-tension terminal.
  
  Fig 12: Measuring Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Secondary coil resistance:
  
  Fig 13: Secondary Coil Resistance Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 14: Measuring Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the resistance is not as specified, replace the ignition coil.
4. Reinstall the ignition coil assembly (See INSTALLATION )
INSPECT CAMSHAFT POSITION SENSOR
1. Disconnect the camshaft position sensor connector.
2. Using an ohmmeter, measure the resistance between terminals.
  Resistance:
  
  Fig 15: Measuring Resistance Between Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the resistance is not as specified, replace the camshaft position sensor.
  
  Fig 16: Resistance Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Reconnect the camshaft position sensor connector.
INSPECT CRANKSHAFT POSITION SENSOR
1. Disconnect the crankshaft position sensor connector
2. Remove the bolt holding the connector bracket to the water pump.
3. Using an ohmmeter, measure the resistance between terminals.
  
  Fig 17: Measuring Resistance Between Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Resistance:
  
  Fig 18: Resistance Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the resistance is not as specified, replace the sensor.
4. Reinstall the bolt holding the connector bracket to the water pump.
5. Reconnect the crankshaft position sensor connector.