Ignition System On-Vehicle Inspection

Check for DTCs.

NOTICE:

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

Check that sparks occur.

1. Remove the No. 1 engine cover.
   

2. Disconnect the 4 ignition coil connectors and remove the 4 bolts and ignition coils.
   





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





4. Disconnect the 4 fuel injector connectors.
   

5. Install the spark plug to each ignition coil, and connect the ignition coil connectors.
   





6. Ground the spark plug.
   

7. Check if a spark occurs at each spark plug while the engine is being cranked.
   

   NOTICE:

   1. Be sure to ground the spark plugs when checking.
      
   2. Replace the ignition coil if it receives an impact.
      
   3. Do not crank the engine for more than 2 seconds.
      

Perform the spark test according to the flowchart below.

1. Check that the ignition coil connector is securely connected.
   

   Result:

   Result	Proceed to
   NG	Connect securely
   OK	Go to next step

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:

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





3. Check the power supply to the ignition coil.
   

   1. Turn the ignition switch to the ON position.
      
   2. Measure the voltage between the terminals of the wire harness side connector.
      

   Standard voltage:

   Tester Connection	Specified Condition
   1 (+B) - 4 (GND)	9 to 14 V

   Result:

   Result	Proceed to
   NG	Check wire harness and connector
   OK	Go to next step

4. Measure the resistance of the camshaft position sensor.
   

   Standard resistance:

   Temperature	Specified Condition
   Cold	835 to 1,400 Ω
   Hot	1,060 to 1,645 Ω

   Result:

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

5. Measure 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 signal from the ECM.
   

   Result:

   Result	Proceed to
   NG	Check ECM (CAMRY_ACV40 RM000000XH40AYX.html)
   OK	Repair wiring between ignition coil and ECM

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

   Torque:

   19 N*m{194 kgf*cm, 14 ft.*lbf}

8. Install the 4 ignition coils with the 4 bolts and connect the 4 ignition coil connectors.
   

   Torque:

   9.0 N*m{92 kgf*cm, 80 in.*lbf}

9. Connect the 4 fuel injector connectors.
   

10. Install the No. 1 engine cover.
    

Check the electrode.

1. Using a megohmmeter, measure the insulation resistance.
   

   Standard insulation resistance:

   10 MΩ or more
   

   HINT:

   1. If a megohmmeter is not available, perform the following simple inspection instead.
      
   2. If the result is 10 MΩ or less, clean the plug and measure the resistance again.
      

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 threads and insulator.
If there is damage, replace the spark plug.

Recommended spark plug:

Manufacturer	Spark plug type
DENSO	SK20R11
NGK	IFR6A11

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 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.