On-Vehicle Inspection

1. Remove the ignition coils and spark plugs (See REMOVAL  ).
2. Install the spark plug to the ignition coil and connect the ignition coil connector.
3. Disconnect the 8 injector connectors.
4. Ground the spark plugs.
5. 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 1: Grounding Spark Plugs

     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 CHART
   
   

   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 CHART
      
      

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

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

      Result 

      RESULT CHART
      
      

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

4. Check the VVT sensor (See INSTALLATION  ).
5. Check the crankshaft position sensor (See REMOVAL  ).
6. Check the IGT signal circuit (See DTC P0351 IGNITION COIL "A" PRIMARY/SECONDARY CIRCUIT; DTC P0352 IGNITION COIL "B" PRIMARY/SECONDARY CIRCUIT; DTC P0353 IGNITION COIL "C" PRIMARY/SECONDARY CIRCUIT; DTC P0354 IGNITION COIL "D" PRIMARY/SECONDARY CIRCUIT; DTC P0355 IGNITION COIL "E" PRIMARY/SECONDARY CIRCUIT; DTC P0356 IGNITION COIL "F" PRIMARY/SECONDARY CIRCUIT; DTC P0357 IGNITION COIL "G" PRIMARY/SECONDARY CIRCUIT; DTC P0358 IGNITION COIL "H" PRIMARY/SECONDARY CIRCUIT ).

1. Using a megohmmeter, measure the insulation resistance.

   Standard Insulation Resistance 

   STANDARD INSULATION RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   Spark Plug (terminal part) - Body Ground	Always	10 MΩ or higher

   Fig 2: Measuring Insulation Resistance

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   If the insulation resistance is below the specified range, replace the spark plug.

   HINT:

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

1. Quickly accelerate the engine to 4000 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 3: Checking Spark Plug

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Recommended Spark Plug 

HINT:

Maximum electrode gap for a used spark plug: 1.3 mm (0.0511 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 (0.0394 to 0.0433 in.)