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 spark test.
1. Check that the spark occurs.
  1. Remove the ignition coil. See step 4) under REPLACEMENT .
  2. Remove the spark plug.
  3. Install the spark plug to the ignition coil, and connect the ignition coil connector.
  4. Disconnect the 8 injector connectors.
  5. Ground the spark plug.
  6. See 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 shown in Fig 1.
    
    Fig 1: Displaying Spark Test
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Inspect spark plugs.
CAUTION:
- Never use a wire brush for cleaning.
- Never attempt to adjust the electrode gap on a used spark plug.
- Spark plugs should be replaced every 200,000 km (120,000 miles).
1. Remove the 8 ignition coils. See step 4) under REPLACEMENT .
2. Inspect the electrode.
  1. Using a megger (insulation resistance meter), measure the insulation resistance.
    
    Fig 2: Measuring Insulation Resistance
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Standard correct insulation resistance:
      1. 10 MΩ or more
    If the resistance is less than specified, proceed to step d.
    NOTE:
    If a megger is not available, this simple method of inspection provides a fairly accurate result.
    Simple Method:
    
    Quickly race the engine to 4000 RPM 5 times.
    
    Remove the spark plug. Go to step c.
    
    Visually check the spark plug.
    
    Fig 3: Displaying Spark Plug
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the electrode is dry, OK
    
    If the electrode is wet, proceed to step d.
    
    Reinstall the spark plug. Go to step g.
3. Using a 16mm plug wrench, remove all 8 spark plugs.
  
  Fig 4: Identifying 16mm Plug Wrench
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Visually check the spark plug for thread damage and insulator damage.
  1. If abnormal, replace the spark plug.
  2. Recommended spark plug: See Fig 5.
    
    Fig 5: Listing Of Recommended Spark Plugs
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Inspect the electrode gaps.
  
  Fig 6: Displaying Correct Electrode Gap
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Correct electrode gap: 1.0-1.1 mm (0.039-0.043 in.)
  2. Maximum electrode gap: 1.3 mm (0.051 in.)
  If the gap is greater than maximum, replace the spark plug.
6. Clean the spark plugs.
  1. If the electrode has traces of wet carbon, allow it to dry and then clean with a spark plug cleaner.
    
    Fig 7: Cleaning Spark Plug With Spark Plug Cleaner
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Air Pressure: Below 588 kPa (6 kgf/cm² , 85 psi)
  3. Duration: 20 seconds or less
  NOTE: If there are traces of oil, remove it with gasoline before using the spark plug cleaner.
7. Using a 16 mm plug wrench, install all 8 spark plugs.
  1. Torque: 18 N.m (180 kgf.cm, 13 ft.lbf)
8. Reinstall the 8 ignition coil. Go to step 5) under REPLACEMENT .
Inspect ignition coils (with igniters). Go to step 1.
Inspect Camshaft Position (CMP) sensor.
1. Remove the 2 bolts, 2 cap nuts and V-bank cover.
2. Disconnect the CMP sensor connector.
3. Using an ohmmeter, measure the resistance between terminals.
  
  Fig 8: Measuring Resistance Between Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Resistance:
    
    Fig 9: Displaying Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the resistance is not as specified, replace the CMP sensor. Go to step 5) under REPLACEMENT .
4. Reconnect the CMP sensor connector.
5. Reinstall the V-bank cover with the 2 bolts and 2 cap nuts.
Inspect Crankshaft Position (CKP) sensor.
1. Remove the CKP sensor. Go to step 2) under REPLACEMENT .
2. Using an ohmmeter, measure the resistance between the terminals.
  
  Fig 10: Measuring Resistance Between Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Resistance:
    
    Fig 11: Displaying Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the resistance is not as specified, replace the CKP sensor.
3. Reinstall the CKP sensor. Go to step 3) under REPLACEMENT .