Ignition System On-Vehicle Inspection

Check for DTCs (COROLLA_ZRE142 RM000000PDK0ZBX.html).

NOTICE:

If any DTC is present, perform troubleshooting in accordance with the procedure for that DTC.

Remove the 4 ignition coils and 4 spark plugs (COROLLA_ZRE142 RM000001QVM03MX.html).

Disconnect the 4 fuel injector connectors.

Install the spark plug into the ignition coil and connect the ignition coil connector.

Ground the spark plug.

Check that spark occurs while the engine is being cranked.

NOTICE:

1. Be sure to ground the spark plugs when checking them.
   
2. 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.
   
3. If a spark plug has been struck or dropped, replace it.
   
4. If an ignition coil assembly has been struck or dropped, replace it.
   

HINT:

If spark does not occur for any cylinder, perform the following Inspect Ignition Coil and Spark Test procedure.

Connect the 4 injector connectors.

Install the 4 ignition coils and 4 spark plugs (COROLLA_ZRE142 RM000001QVK03PX.html).

Check for DTCs (COROLLA_ZRE142 RM000000PDK0ZBX.html).

Clear the DTCs (COROLLA_ZRE142 RM000000PDK0ZBX.html).

Check that the wire harness side connector of the ignition coil with igniter is securely connected.

Result:

Result	Action
NG	Connect securely
OK	Go to next step

Perform the spark test on each ignition coil with igniter.

1. Replace the ignition coil with igniter with a known good one.
   

2. Perform the spark test again.
   

   Result:

   Result	Action
   OK	Replace ignition coil with igniter
   NG	Go to next step

Check the spark plug.

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

2. Perform the spark test again.
   

   Result:

   Result	Action
   OK	Replace spark plug
   NG	Inspect the ignition system (COROLLA_ZRE142 RM000000XH40QZX.html).

Check the electrode.

1. Using a megohmmeter, measure the insulation resistance.
   

   Standard Resistance:

   10 MΩ or more
   

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

   HINT:

   If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.

Alternative inspection method:

1. Quickly accelerate the engine to 4000 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.
   

Check the spark plug for any damage to its threads and insulator.
If there is any damage, replace the spark plug.

Recommended Spark Plug:

Manufacturer	Product
DENSO	SK20R11
NGK	IFR6A11

Reference:

Maximum Electrode Gap for Used Spark Plug:

Electrode Gap

1.3 mm (0.0512 in.)

Electrode Gap for New Spark Plug:

Electrode Gap

1.0 to 1.1 mm (0.0394 to 0.0433 in.)

Clean the spark plug.
If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner and then dry it.

Air pressure:

588 kPa (6 kgf/cm², 85 psi)

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.