Ignition System (3MZ-FE): Inspection

1. Inspect the resistance.
   1. Using an ohmmeter, measure the resistance between the insulation and body ground.
   1. Resistance: 10 MΩ or more 

   If the resistance is not as specified, check the electrode gap.

   Fig 1: Measuring Resistance Between Insulation & Body Ground

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2. Alternative inspection method.
   1. Quickly accelerate the engine speed to 4,000 RPM 5 times.
   2. Remove the spark plug.
   3. Visually check the spark plug.
   4. If the electrode is dry...OK.
   5. If the electrode is wet...Proceed to step (c).
   6. Reinstall the spark plug.
      Fig 2: Locating Spark Plug

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3. Check the appearance.
   1. Check the thread and insulator of the spark plug for damage.

   If damaged, replace the spark plug.

   Recommended spark plug: 

   SPARK PLUG TYPE
   
   

   Supplier	Type
   DENSO	SK20R11
   NGK	IFR6A11

   Fig 3: Checking Spark Plug Threads

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4. Inspect the electrode gap.
   1. Using a spark plug gauge, measure the electrode gap.
   1. Maximum electrode gap of used spark plug: 
   2. 1.3 mm (0.051 in.) 

   If the electrode gap is greater than maximum, replace the spark plug.

   1. Electrode gap of new spark plug: 
   2. 1.0 to 1.1 mm (0.039 to 0.043 in.) 
   Fig 4: Measuring Spark Plug Gap

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Clean the spark plugs.

If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner, then dry it.

1. Air pressure: Blow 588 kPa (6 kgf/cm ²  , 85 psi) 
2. Duration: 20 seconds or shorter 

If there are traces of oil, remove it with gasoline before using the spark plug cleaner.

Fig 5: Cleaning Spark Plug Cleaner

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1. Inspect the resistance.
   1. Using an ohmmeter, measure the resistance between the terminals.
   1. Resistance: 
   TESTER CONNECTION & SPECIFIC CONDITIONS
   
   

   Tester Connection	Specified Condition
   1 (G+) - 2 (G-)	835 to 1,400 Ω at cold
   1 (G+) - 2 (G-)	1,060 to 1,645 Ω at hot

If the resistance is not as specified, replace the VVT sensor.

Fig 6: Measuring Resistance Between Terminal

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1. Inspect the resistance.
   1. Using an ohmmeter, measure the resistance between the terminals.
   1. Resistance: 
   TESTER CONNECTION & SPECIFIC CONDITION
   
   

   Tester Connection	Specified Condition
   1 (NE+) - 2 (NE-)	1,630 to 2,740 Ω at cold
   1 (NE+) - 2 (NE-)	2,065 to 3,225 Ω at hot

If the resistance is not as specified, replace the crankshaft position sensor.

Fig 7: Measuring Resistance Between Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002