Ignition System: Testing and Inspection

1GR-FE IGNITION: IGNITION SYSTEM: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. CHECK IGNITION COIL ASSEMBLY AND PERFORM SPARK TEST
(a) Check for DTCs.
NOTE: If any DTC is present, perform troubleshooting in accordance with a procedure for that DTC.

(b) Check that sparks occur.
(1) Remove the ignition coils.
(2) Using a 16 mm plug wrench, remove the spark plugs.
(3) Install the spark plugs onto the ignition coils, and connect the ignition coil connectors.
(4) Disconnect the 6 injector connectors.
(5) Ground the spark plugs.
(6) Check that sparks occur at each spark plug while the engine is being cranked.
NOTICE:
- Be sure to ground the spark plugs when checking.
- Replace any ignition coils that have been subjected to any physical impact.
- Do not crank the engine for more than 2 seconds.

If sparks do not occur, perform the following test:
(c) Spark test flow chart.
(1) Check that the wire harness side connector of ignition coil with igniter is securely connected.
Result:





(2) Perform the spark test on each ignition coil with igniter.
1.Replace the ignition coil with igniter with a functioning one.
2.Perform the spark test again.
Result:





(3) Check that the power is supplied to the ignition coil.
1.Turn the ignition switch ON.
2.Check that the positive (+) battery voltage is applied to the positive (+) terminal of the ignition coil.
Result:





(4) Measure the output voltage of the VVT sensor.
1.Inspect the VVT sensor in accordance with the procedure P0340.
Result:





(5) Check the resistance in crankshaft position sensor.
Standard resistance:






Result:





(6) Check the IGT signal from the ECM.
Result:






(d) Using a 16 mm plug wrench, install the spark plugs.
(e) Install the ignition coils.
2. INSPECT SPARK PLUG
NOTE: Do not use a wire brush for cleaning.





(a) Check the electrode.
(1) Using a mega ohm meter, measure the insulation resistance.
Standard resistance:
10 MOhms or more
HINT:
- If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.
- If a mega ohm meter is not available, perform the following simple inspection instead.

(b) Alternative inspection method.
(1) Quickly accelerate the engine to 4,000 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.
(c) Check the spark plug for any damage to its thread and insulator.
If there is damage, replace the spark plug.
Recommended spark plug:










(d) Check the spark plug electrode gap.
Maximum electrode gap for used spark plug:





If the gap is greater than the maximum, replace the spark plug.
Electrode gap for new spark plug:










(e) Clean the spark plug.
If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner and then dry it.
Air pressure:
Below 588 kPa (6 kg/cm2, 85 psi)
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.