Ignition System: Testing and Inspection
2UR-GSE ENGINE CONTROL: IGNITION SYSTEM: ON-VEHICLE INSPECTION
1. PERFORM SPARK TEST
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
NOTICE:
If any DTC is present, perform troubleshooting procedures for that DTC.
(b) Check that spark occurs.
(1) Remove the ignition coils and spark plugs Removal.
(2) Disconnect the 2 fuel delivery pipe connectors.
(3) Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
HINT
To release each connector lock, push the claw downward ("Release" in the illustration) and move the lock lever ("Move" in the illustration).
(4) Install the spark plug into the ignition coil, and then connect the ignition coil connectors (step 4).
(5) Ground the spark plug (step 5).
(6) Check that spark occurs while the engine is being cranked (step 6).
NOTICE:
* Be sure to ground the spark plugs when checking them.
* Do not crank the engine for more than 2 seconds.
Cranking will stop if the engine switch is pushed again for models with cranking holding function.
* If a spark plug has been struck or dropped, replace it.
* If an ignition coil assembly has been struck or dropped, replace it.
HINT
* Repeat steps 4 - 6 for each spark plug and ignition coil.
* If spark does not occur for any cylinder, perform the following Inspect Ignition Coil and Spark Test procedure.
(c) Connect the 4 connectors with wire harness locks to the 2 injector drivers.
NOTICE:
Connect the connectors securely.
HINT
Move the lock lever in the direction indicated by the arrow to lock the connector.
(d) Connect the 2 fuel delivery pipe connectors.
(e) Install the ignition coils and spark plugs Installation.
(f) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
2. INSPECT IGNITION COIL AND SPARK TEST
(a) Check that the ignition coil connector is securely connected.
Result:
(b) Perform a spark test on each ignition coil assembly.
(1) Replace the ignition coil assembly with a known good one.
(2) Perform the spark test again.
Result:
(c) Perform a spark test on each spark plug.
(1) Replace the spark plug with a known good one.
(2) Perform the spark test again.
Result:
3. CHECK 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 using a megohmmeter:
(1) Using a megohmmeter, measure the insulation resistance.
Standard insulation resistance:
10 MOhms or more
HINT
* If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.
* 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.
(4) Install the spark plug Installation.
(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: 1.4 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 (0.0394 to 0.0433 in.)
NOTICE:
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 (6.0 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.