Ignition System: Testing and Inspection

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

1. PERFORM SPARK TEST

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

NOTICE:
If any DTC is output, perform the troubleshooting procedures for that DTC.

(b) Check if sparks occur.

(1) Remove the 6 spark plugs Removal.

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

(3) Disconnect the fuel pump ECU connector.

(4) Ground the spark plug.

(5) Visually check that sparks occur while the engine is being cranked.

NOTICE:
* 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.

2. INSPECT IGNITION COIL AND SPARK PLUG

(a) Spark test flowchart.

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

Result





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

1 If there is a cylinder where sparks do not occur, replace its ignition coil with the ignition coil of a cylinder where sparks occur normally.

2 Crank the engine and visually check that sparks occur at the cylinder with the normally operating ignition coil.

Result





(3) Check power supply to 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





(4) Inspect the spark plug.

1 Replace the spark plug with a normal one.

2 Perform spark test again.

Result





NOTICE:
* 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.

(b) Install the 6 spark plugs Installation.

(c) Connect the fuel pump ECU connector.

3. INSPECT SPARK PLUG

(a) Check the electrode.

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





Standard Insulation Resistance:





Text in Illustration





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

(b) Alternative inspection method:

(1) Start the engine.*

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

NOTICE:
*: 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.

(c) Check the spark plug for any damage on its threads and insulator.

If there is damage, replace the spark plug. If not, reinstall the spark plug.

Recommended Spark Plug:





(d) Clean the spark plugs.





(e) Check the spark plug electrode gap.

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.)