On-Vehicle Inspection [09/2015 - ]: Procedure

1. Remove the ignition coils and spark plugs. Refer to REMOVAL [09/2015 - ] .
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 plug.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

5. Visually check that sparks occur while the engine is being cranked.
   NOTE:

   • When performing the inspection, be sure to ground the hexagonal portion or the threaded portion of the spark plug.
   • Do not crank the engine for more than 2 seconds.

     For vehicles with a cranking hold function, turn the engine switch off during cranking to stop cranking.

   • If an ignition coil assembly is struck or dropped, replace it with a new one.
   • If a spark plug is struck or dropped, replace it with a new one.

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

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

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

4. Check spark plug.
   RESULT
   
   

   Result	Proceed to
   NG	Replace spark plug
   OK	Inspect the ignition system (Refer to 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 [09/2015 - 08/2020] Refer to 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 [08/2020 - ] )

   NOTE:

   • If an ignition coil assembly is struck or dropped, replace it with a new one.
   • If a spark plug is struck or dropped, replace it with a new one.

1. Using a megohmmeter, measure the insulation resistance.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Insulation Resistance

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

   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. Start the engine.*
2. Quickly accelerate the engine to 4000 rpm 5 times.*
   NOTE:

   *: Do not perform this step if P0300 (misfire detection) or a related DTC is stored.

3. Remove the spark plug.
4. Visually check the spark plug.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   If the electrode is dry, the spark plug is functioning properly. If the electrode is damp, proceed to the next step.

If there is any damage, replace the spark plug.

Recommended Spark Plug

HINT: 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Maximum electrode gap for a used spark plug: 1.3 mm (0.051 in.).

If the gap is more 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.).

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard duration

20 seconds or less

Standard air pressure

588 kPa (6.0 kgf/cm² , 85 psi)

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.