Ignition System: Testing and Inspection

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

ON-VEHICLE INSPECTION
NOTE: 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. PERFORM SPARK TEST
(a) Check for DTCs DTC Check / Clear.
NOTE: If a DTC is present, perform troubleshooting in accordance with the procedure for that DTC.

(b) Check that sparks occur.
(1) Remove the ignition coil Removal.




(2) Disconnect the 4 fuel injector connectors.




(3) Using a 16 mm plug wrench, remove the 4 spark plugs.
Torque: 18 Nm (184 kgf-cm, 13 ft-lbf)




(4) Install each spark plug into an ignition coil, then connect the ignition coil connectors.
(5) Ground the spark plug.
(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 them.
- If the ignition coil has been struck or dropped, replace it.
- Do not crank the engine for more than 2 seconds.

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





(2) Perform the spark test on each ignition coil.
1. Replace the ignition coil with a normal one.
2. Perform the spark test again.

Result:









(3) Check power supply to the ignition coil.

- Disconnect the ignition coil connector.
- Turn the ignition switch ON.
- Using a voltmeter, measure the voltage between the terminals.

Standard voltage:






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 IGT signal from the ECM.
Result:






2. CHECK SPARK PLUG





(a) Check the electrode.
(1) Using a megohmmeter, measure the insulation resistance.
Standard insulation resistance:
10 MOhms or more
HINT:
- If a megohmmeter is not available, perform the following simple inspection instead.
- If the result is 10 MOhms or less, clean the plug and measure the resistance again.

(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 on 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:
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.)





(e) Clean the spark plugs.
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.