On-Vehicle Inspection

1. Remove the ignition coils and spark plugs (See REMOVAL ).
2. Disconnect the 4 injector connectors.
3. Install the spark plug into the ignition coil, and then connect the ignition coil connector.
   Fig 1: Locating Injector Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Ground the spark plug.
5. Check that spark occurs at each spark plug while the engine is being cranked.
   NOTE:

   • Be sure to ground the spark plugs when checking them.
   • If an ignition coil has been struck or dropped, replace it.
   • Do not crank the engine for more than 2 seconds.
   Fig 2: Checking Spark Occurs At Each Spark Plug While Engine Is Being Cranked

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   If spark does not occur, perform the following procedure (go to step (c)).

6. Connect the 4 fuel injector connectors.
7. Install the spark plugs and ignition coils (See REMOVAL ).
8. Clear the DTCs (See DTC CHECK/CLEAR ).

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

   Result 

   RESULT REFERENCE CHART
   
   

   Result	Action
   NG	Connect securely
   OK	Go to next step

2. Perform a spark test on each ignition coil.
   1. Replace the ignition coil with a known good one.
   2. Perform the spark test again.

      Result 

   RESULT REFERENCE CHART
   
   

   Result	Action
   NG	Go to next step
   OK	Replace ignition coil

3. Perform a spark test on each spark plug.
   1. Replace the spark plug with a known good one.
   2. Perform the spark test again.

      Result 

   RESULT REFERENCE CHART
   
   

   Result	Action
   NG	Go to next step
   OK	Replace spark plug

4. Check that power is supplied to the ignition coil.
   1. Turn the ignition switch to ON.
   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

   STANDARD VOLTAGE
   
   

   Tester Connection	Condition	Specified Condition
   1 (+B) - 4 (GND)	Ignition switch ON	11 to 14 V

   Result 

   RESULT REFERENCE CHART
   
   

   Result	Action
   NG	Check wiring between ignition switch and ignition coil with igniter and check ground circuit
   OK	Replace the ECM

1. Using a megohmmeter, measure the insulation resistance.

   Standard Insulation Resistance 

HINT:

• If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.
• If a megohmmeter is not available, perform the following simple inspection instead.

Fig 4: Measuring Insulation Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 5: Inspecting Spark Plug

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If there is any damage, replace the spark plug.

Recommended Spark Plug 

1. Check the spark plug electrode gap.

   Maximum Electrode Gap for a Used Spark Plug: 

   1.3 mm (0.0512 in.) 

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

   NOTE: Never attempt to adjust the gap of a used plug.

   Electrode Gap for a New Spark Plug: 1.0 to 1.1 mm (0.0394 to 0.0433 in.) 

   Fig 6: Measuring 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 

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.

Fig 7: Cleaning Spark Plug

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002