Ignition System (For Sedan) On-Vehicle Inspection

Check for DTCs.

NOTICE:

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

Check whether sparks occur.

1. Remove cylinder head cover No. 2 (YARIS_NCP93 RM000001EFJ02JX_01_0002.html).
   

2. Remove the 4 ignition coils (YARIS_NCP93 RM000001EFJ02JX_01_0003.html).
   

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:

   1. Ground the spark plug when checking it.
      
   2. Replace any ignition coils that have been subjected to any physical impact.
      
   3. Do not crank the engine for more than 2 seconds.
      
   If sparks do not occur, perform the following procedure.
   

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:

   Result	Proceed to
   NG	Connect securely
   OK	Go to next step

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:

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

3. Check that the power is supplied to the ignition coil with igniter.
   

   1. Turn the engine switch ON.
      
   2. Check that the battery voltage is applied to the positive (+) terminal of the ignition coil (YARIS_NCP93 RM000000XH40L5X.html).
      

   Result:

   Result	Proceed to
   NG	Check wiring between ignition switch and ignition coil with igniter
   OK	Go to next step

4. Check the resistance of the camshaft position sensor.
   

   Standard resistance:

   Temperature	Specified Condition
   Cold	1,630 to 2,740 Ω
   Hot	2,065 to 3,225 Ω

   Result:

   Result	Proceed to
   NG	Replace camshaft position sensor
   OK	Go to next step

5. Check the resistance of the crankshaft position sensor.
   

   Standard resistance:

   Temperature	Specified Condition
   Cold	985 to 1,600 Ω
   Hot	1,265 to 1,890 Ω

   Result:

   Result	Proceed to
   NG	Replace crankshaft position sensor
   OK	Go to next step

6. Check the IGT from the ECM (YARIS_NCP93 RM000000XH40L5X.html).
   

   Result:

   Result	Proceed to
   NG	Check ECM
   OK	Repair wiring between ignition coil and ECM

Connect the 4 injector connectors.

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

Torque:

18 N*m{184 kgf*cm, 13 ft.*lbf}

Install the 4 ignition coils (YARIS_NCP93 RM000001EFH02JX_01_0001.html).

Install cylinder head cover No. 2 (YARIS_NCP93 RM000001EFH02JX_01_0002.html).

Check the electrode.

1. Using a megaohmmeter, measure the insulation resistance.
   

   Standard resistance:

   10 MΩ or more
   

   HINT:

   1. If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.
      
   2. If a megaohmmeter is not available, perform the following simple inspection instead.
      

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.
   

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

Recommended spark plug:

Manufacturer	Product
DENSO	SK16R11
NGK	IFR5A11

Check the spark plug electrode gap.

Maximum electrode gap for used spark plug:

1.3 mm (0.051 in.)

Electrode gap for new spark plug:

1.0 to 1.1 mm (0.039 to 0.043 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.