Ignition System: Testing and Inspection

4GR-FSE IGNITION: IGNITION SYSTEM: ON-VEHICLE INSPECTION

1. SPARK PLUG

(a) Check for DTCs DTC Check / Clear.

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

(b) Check that spark occurs.

(1) Remove the ignition coil assemblies and spark plugs Removal.

(2) Disconnect the 6 injector connectors.

(3) Install the spark plug into the ignition coil assembly, and then connect the ignition coil assembly connectors (step 3).

(4) Ground the spark plug (step 4).

(5) Check that spark occurs while the engine is being cranked (step 5).

NOTICE:
* Be sure to ground the spark plug when checking.
* Replace the ignition coil assembly if it receives an impact.
* Do not crank the engine for more than 2 seconds.
HINT
* Repeat steps 3- 5 for each spark plug and ignition coil assembly.
* If spark does not occur, perform the following procedure for the malfunctioning cylinder.
(c) Perform the following spark test procedure.

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

Result:





(2) Perform a spark test.

* 1. Replace the ignition coil assembly with a known good one.

* 2. Perform the spark test again.

Result:





(3) Perform a spark test.

* 1. Replace the spark plug with a known good one.

* 2. Perform the spark test again.

Result:





(4) Check the power supply.

1 Turn the engine switch on (IG).

2 Measure the voltage according to the value(s) in the table below.

Text in Illustration:

Standard Voltage:





Result:





(d) Connect the 6 injector connectors.

(e) Install the ignition coil assemblies and spark plugs Installation.

(f) Clear the DTCs DTC Check / Clear.

2. INSPECT SPARK PLUG

NOTICE:
* Do not use a wire brush for cleaning.
* Do not attempt to adjust the electrode gap of a used spark plug.
(a) Check the electrode.





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

Insulation resistance:

10 MOhms or more

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

(b) Alternative inspection method:





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

(2) Remove the spark plug Removal.

(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.

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

Recommended spark plug:





(d) Check the spark plug electrode gap.





Maximum electrode gap for a used spark plug:

1.4 mm (0.0551 in.)

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

Electrode gap for a new spark plug:

1.0 to 1.1 mm (0.0393 to 0.0433 in.)

NOTICE:
If adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip. Never attempt to adjust the gap of a used plug.