Ignition System: Testing and Inspection

1UR-FSE IGNITION: IGNITION SYSTEM: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. PERFORM SPARK TEST
(a) Check for DTCs.
NOTE:
If any DTC is present, perform troubleshooting procedures for that DTC.

(b) Check if spark occurs.
(1) Remove the ignition coils and spark plugs Removal.
(2) Install the spark plug to the ignition coil and connect the ignition coil connector.




(3) Disconnect the 2 fuel delivery pipe connectors.




(4) Disconnect the 4 connectors from the 2 injector drivers with wire harness locks.
HINT: To release each connector lock, push the claw downward ("Release" in the illustration) and move the lock lever ("Move" in the illustration).




(5) Ground the spark plug.
(6) Visually check that spark occurs while the engine is being cranked.
NOTICE:
- Be sure to ground the spark plug when checking.
- If the ignition coil has been struck or dropped, replace it.
- Do not crank the engine for more than 2 seconds.

(c) Perform the spark test according to the procedures below:
(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 spark does not occur, replace its ignition coil with the ignition coil of a cylinder where spark occurs normally.
2 Crank the engine and visually check that spark occurs at the cylinder with the normally operating ignition coil.

Result:





(3) Inspect the spark plug.
Result:





(4) Check the power supply to the 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:





(5) Check the VVT sensor Testing and Inspection.
(6) Check the camshaft position sensor Testing and Inspection.
(7) Check the crankshaft position sensor Testing and Inspection.
(8) Check the IGT signal circuit P0351.





(d) Connect the 4 connectors to the 2 injector drivers with wire harness locks.
NOTE:
Connect the connectors securely.
HINT: Move the lock lever in the direction indicated by the arrow to lock the connector.





(e) Connect the 2 fuel delivery pipe connectors.
(f) Install the ignition coils and spark plugs 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 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.





(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 threads and insulator.




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









HINT: Maximum electrode gap for a used spark plug: 1.3 mm (0.051 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 (0.039 to 0.043 in.)




NOTE:
Never attempt to adjust the gap of a used plug.
If the electrode has traces of wet carbon, allow it to dry and then clean it with a spark plug cleaner.
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.