Ignition System: Testing and Inspection

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

HINT
In this section, the terms Cold and Hot refer to the temperature of the coils. Cold means approximately -10 to 50 °C (14 to 122 °F). Hot means approximately 50 to 100 °C (122 to 212 °F).

1. INSPECT IGNITION COIL AND SPARK TEST

(a) Check for DTCs.

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

(b) Check whether sparks occur.

(1) Remove cylinder head cover No. 2 Removal.

(2) Remove the 4 ignition coils Removal.

(3) Using a 16 mm (0.63 in) plug wrench, remove the 4 spark plugs.

(4) Install the spark plug onto each ignition coil and connect the ignition coil connectors.

(5) Disconnect the 4 injector connectors.

(6) Ground the spark plugs.

(7) Check that sparks occur while the engine is being cranked.

NOTICE:
* Ground the spark plug when checking it.
* Replace the ignition coil if it has been subjected to a physical impact.
* Do not crank the engine for more than 2 seconds.

(c) Perform the spark test in accordance with the following procedure.

(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 Replace the ignition coil with igniter with a functioning one.

2 Perform the spark test again.

Result:





(3) Check the power supply to ignition coil with igniter.

1 Turn the engine switch on (IG).

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

Result:





(4) Check the resistance of the camshaft position sensor.

Standard resistance:





Result:





(5) Check the resistance of the crankshaft position sensor.

Standard resistance:





Result:





(6) Check the IGT signal from the ECM.

Result:





(d) Connect the 4 injector connectors.

(e) Using a 16 mm (0.63 in) plug wrench, install the 4 spark plugs.

Torque : 18 Nm (184 kgf-cm, 13 ft-lbf)

(f) Install the 4 ignition coils Installation.

(g) Install cylinder head cover No. 2 Installation.

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 megaohmmeter, measure the insulation resistance.

Standard resistance:

10 MOhms or more

HINT
If a megaohmmeter 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 4 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.

(4) Check the spark plug for any damage to its thread and insulator.

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

Recommended spark plug:





(5) Check the spark plug electrode gap.





Maximum electrode gap for used spark plug:

1.3 mm (0.051 in.)

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

Electrode gap for new spark plug:

1.0 to 1.1 mm (0.039 to 0.043 in.)

NOTICE:
When 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 spark plug.