Spark Plug: Testing and Inspection

2GR-FE IGNITION: IGNITION COIL AND SPARK PLUG: ON-VEHICLE INSPECTION

1. INSPECT IGNITION COIL ASSEMBLY

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

NOTICE:
If any DTC is present, perform troubleshooting in accordance with the procedure for that DTC.

(b) Remove the ignition coil assembly and spark plug Removal.

(c) Check that sparks occur.

(1) Disconnect the 6 fuel injector connectors.





(2) Install the spark plug to ignition coil, and connect the ignition coil connector.

(3) Ground the spark plug.





(4) Check if spark occurs at each spark plug while the engine is being cranked.

NOTICE:
* Be sure to ground the spark plugs during the inspection.
* Replace the ignition coil if it receives an impact.
* Do not crank the engine for more than 2 seconds.

(d) Perform the spark test according to the flowchart below:

(1) Check that the ignition coil connector is securely connected.

Result:





(2) Perform a spark test on each ignition coil.

Replace the ignition coil with a known good one.

Perform the spark test again.

Result:





(3) Check the spark plug (to INSPECT SPARK PLUG).

Result:





(4) Check the power supply to the ignition coil.

Turn the ignition switch on (IG).

Check that there is battery voltage at the ignition coil positive (+) terminal.





Standard Voltage:





Result:





(e) Using a 16 mm plug wrench, install the spark plugs.

Torque : 18 Nm (183 kgf-cm, 13 ft-lbf)

(f) Connect the 6 fuel injector connectors.

(g) Install the ignition coil assembly Installation.

2. INSPECT SPARK PLUG

NOTICE:
* Never use a wire brush for cleaning.
* Never attempt to adjust the electrode gap on a used spark plug.

(a) Check the electrode.





(1) Using a megohmmeter, measure the insulation resistance.

Standard insulation resistance:

10 MOhms or higher

HINT
* If the result is below 10 MOhms, clean the plug and measure the resistance again.
* If a megohmmeter is not available, perform the following inspection instead.

(b) Alternative inspection method:

(1) Quickly accelerate the engine to 4000 rpm 5 times.

(2) Remove the spark plugs.

(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.

(c) Check the spark plug for any damage to its threads and insulator. If there is damage, replace the spark plug.

Recommended spark plug:





NOTICE:
Use only the listed spark plug or equivalent to ensure engine performance and smooth driveability.

(d) Check the spark plug electrode gap.





Maximum electrode gap for a used spark plug:

1.4 mm (0.055 in.)

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

(e) Clean the spark plugs.

Electrode gap for a new spark plug (for reference):

1.0 to 1.1 mm (0.039 to 0.043 in.)





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 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.

(f) Install the ignition coil assembly and spark plug. Installation.