On-Vehicle Inspection

1. Remove the ignition coils and spark plugs. Refer to REMOVAL .
2. Install the spark plug to the ignition coil and connect the ignition coil connector.
3. Disconnect the 4 injector connectors.
   Fig 1: Locating Injector Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Ground the spark plug.
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 ignition 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 a malfunctioning ignition coil with igniter.
   1. Replace the ignition coil with a normal one.
   2. Perform the spark test again.
   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 ignition switch to ON.
   2. Check that there is battery voltage at the ignition coil positive (+) terminal.
   RESULT
   
   

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

4. Inspect the spark plugs.
   1. If there is a cylinder in which ignition does not occur, interchange the spark plug of that cylinder and the spark plug of a cylinder in which ignition properly occurs.
   2. Check that sparks occur in the cylinder in which the properly functioning spark plug was installed.

      Result

      Result	Proceed to
      OK	Replace the spark plug
      NG	Inspect the ignition system. Refer to DTC P0351, P0352, P0353, P0354: Ignition Coil "A" Primary/Secondary Circuit; Ignition Coil "B" Primary/Secondary Circuit; Ignition Coil "C" Primary/Secondary Circuit; Ignition Coil "D" Primary/Secondary Circuit

   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.
5. Connect the 4 injector connectors.
6. Install the ignition coils and spark plugs. Refer to INSTALLATION .

Fig 2: Checking The Electrode

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Using a megohmmeter, measure the insulation resistance.

   Standard Insulation Resistance

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

   TEXT IN ILLUSTRATION
   
   

   *1

   Ground

   HINT: 

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

1. Start the engine.*
2. Increase the engine speed to 4000 rpm and then let the engine speed decrease. Perform this operation 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.

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

If there is damage, replace the spark plug.

Recommended Spark Plug

Maximum electrode gap for used spark plug

1.3 mm (0.0512 in.)

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

Electrode gap for new spark plug

1.0 to 1.1 mm (0.0394 to 0.0433 in.)

Fig 3: Identifying Electrode With Spark Plug Component Cleaner

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard air pressure

588 kPa (6 kgf/cm² , 85 psi)

Standard duration

20 seconds or less

HINT: 

Only use a 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.