On-Vehicle Inspection

1. Remove the ignition coils (see REMOVAL ).
2. Using a 16 mm plug wrench, remove the spark plugs.
3. Install the spark plug to the ignition coil and connect the ignition coil connector.
4. Disconnect the 4 injector connectors.
   Fig 1: Locating Injector Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Disconnect the 2 injector driver connectors by the following procedures: 1) move the lock lever in the direction indicated by the arrow to release the connector lock, then 2) disconnect the connectors with wire harness lock.
   Fig 2: Locating Connectors With Wire Harness Lock

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Ground the spark plug.
7. Visually check that sparks occur while the engine is being cranked.
   NOTE:

   • Be sure to ground the spark plug when checking.
   • If the ignition coil has been struck or dropped, replace it.
   • Do not crank the engine for more than 2 seconds.

Fig 3: Checking Sparks Plug

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check that the wire harness side connector of the ignition coil with igniter is securely connected.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   NG	Connect securely
   OK	Go to next step

2. Perform a spark test on each ignition coil with igniter.
   1. If there is a cylinder where sparks do not occur, replace its ignition coil with the ignition coil of a cylinder where sparks occur normally.
   2. Crank the engine and visually check that sparks occur at the cylinder with the normally operating ignition coil.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   OK	Replace ignition coil with igniter
   NG	Go to next step

3. Inspect spark plug.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   NG	Replace spark plug
   OK	Go to next step

4. Check the power supply to the ignition coil with igniter.
   1. Turn the engine switch on (IG).
   2. Check that there is battery voltage at the ignition coil positive (+) terminal.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   NG	Check wiring between engine switch and ignition coil with igniter
   OK	Go to next step

5. Check the VVT sensor (see DTC P0340 CAMSHAFT POSITION SENSOR CIRCUIT MALFUNCTION .
6. Check the crankshaft position sensor (see INSPECTION ).
7. Check the IGT, IGF signal circuit (see DTC P0351 IGNITION COIL "A" PRIMARY / SECONDARY CIRCUIT .

Torque: 18 N*m (184 kgf*cm, 13 ft.*lbf) 

1. Using a megohmmeter, measure the insulation resistance.

   Standard insulation resistance: 

   10 MΩ or more 

   HINT:

   If a megohmmeter is not available, perform the following simple inspection instead.

Fig 6: Measuring Insulation Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 properly. If the electrode is damp, proceed to the next step.

Fig 7: Identifying Spark Plug

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If there is any damage, replace the spark plug.

Recommended spark plug 

Fig 8: Checking Spark Plug Threads

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Maximum electrode gap for a used spark plug: 

1.4 mm (0.055 in.) 

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

Electrode gap for a new spark plug: 

1.0 to 1.1 mm (0.039 to 0.043 in.) 

Fig 9: Checking Spark Plug Electrode Gap

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard air pressure: 

588 kPa (6 kgf/cm ²  , 85 psi) 

Standard 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 before using the spark plug cleaner.