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 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:

   • 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 2: Checking Spark 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 a malfunctioning ignition coil with igniter.
   1. Replace the ignition coil with a normal one.
   2. Perform the spark test again.

      Result 

      RESULT REFERENCE
      
      

      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 REFERENCE
      
      

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

4. Check the camshaft position sensor (See DTC P0340 CAMSHAFT POSITION SENSOR CIRCUIT MALFUNCTION; DTC P0342 CAMSHAFT POSITION SENSOR "A" CIRCUIT LOW INPUT (BANK 1 OR SINGLE SENSOR); DTC P0343 CAMSHAFT POSITION SENSOR "A" CIRCUIT HIGH INPUT (BANK 1 OR SINGLE SENSOR) ).
5. Check the crankshaft position sensor (See DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT; DTC P0339 CRANKSHAFT POSITION SENSOR "A" CIRCUIT INTERMITTENT ).
6. Check the IGT signal from the ECM (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 ).
7. Connect the 4 injector connectors.
8. Install the ignition coils and spark plugs (See REMOVAL  ).

1. Using a megohmmeter, measure the insulation resistance.

   Standard Insulation Resistance 

   RESISTANCE SPECIFICATION
   
   

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

   Fig 3: Measuring Insulation Resistance

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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 4: Identifying Spark Plug Condition

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If there is damage, replace the spark plug.

Recommended Spark Plug 

Maximum electrode gap for used spark plug: 

1.3 mm (0.051 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 (0.039 to 0.043 in.) 

Fig 5: Identifying Spark Plug Electrode Gap

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/cm ²  , 85 psi) 

Standard duration: 

20 seconds or less 

Fig 6: Cleaning Electrode With Spark Plug Cleaner

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.